International Space Station ISS Transiting in front of the Sun´s Chromosphere visible in H-alpha Emission
The image shows the International Space Station (ISS) silhouette while crossing in front of the Sun´s disc at a distance of 441.54km from us and at a speed of about 7.31km/s. The ISS completes an entire orbit around Earth each 90 minutes. Carrying on board astronauts, the large artificial satellite orbiting our planet with a width of 108.5 meters had an angular diameter of 62.58″ seems although very small when compared with the Solar disc with an angular size of 31.6′ was actually 30.3 times larger than the ISS at the moment of the passage. Hard to see it even with a special telescope equipped with Ha filters, only the fast video camera from Player One Astronomy Apollo-M Max with a shutter set to an high speed frame rate of 109 images per second at 16Bits, could capture this rare moment that happens in a blink of an eye. Seen from Figueira da Foz, northern cost of Portugal, on June 2, 2024, at 13h18m51s (UT 12h18m51.35s) the transit had a total duration of only 0,54 seconds. Its interesting to recognise on the picture the ISS structure with the solar panels and main body elements well distinct. The image also shows in great detail spicules on the surface, a large gas filament and a large active region, as well as a few solar prominences around the Sun’s lilmb. With a diameter of 1,392,000 km, our Sun is composed of 73% Hydrogen, 25% Helium and 2% from heavier elements. The video shows a time lapse of 200 images captured over the course of around 2 seconds. Images were processed individually withouth being stack, I was impressed with a quality achieved only with single frames. The ISS is visible in white on the first sequence, because of the inversion technique for processing the chromosphere with more depth. Second sequence shows the ISS in black without this inversion visible.
PT: A imagem revela a silhueta da Estação Espacial Internacional (ISS) atravessando o sol a uma distância de 441.54km de nós e uma velocidade média de cerca de 7.31km/s. A ISS completa uma órbita em torno da Terra a cada 90 minutos. Transportando a bordo vários astronautas, este grande satélite artificial com uma envergadura de 108,5 metros parece muito pequeno quando comparado com o disco solar com um tamanho angular de 31,6′ encontrava-se na verdade cerca de 30,3 vezes maior do que a ISS no momento da passagem. Difícil de observá-la mesmo com um telescópio especial equipado com filtros de protecção H-alfa, só uma câmara muito rápida como a Player One Astronomy Apollo-M Max com o obturador a captar 109 images por segundo a 16 Bits, teria a capacidade de eternizar este momento raro que acontece num um piscar de olhos, com a curta duração de apenas 0.54 segundos. Visto a partir da Figueira da Foz, na costa norte de Portugal, a 2 de junho de 2024, às 13h18m51s (UT 12h18m51s ). Na fotografia é possível reconhecer a estrutura da ISS com os seus painéis solares e os elementos que compõem o corpo principal. A imagem também mostra em grande detalhe espículas na superfície, um grande filamento de gás e uma grande região activa extensa, bem como algumas proeminências solares ao redor do limbo solar. Com um diâmetro de 1.392.000 km, o nosso Sol é composto por 73% de Hidrogénio, 25% de Hélio e 2% de elementos mais pesados. A imagem captada a partir do meu terraço, revela assim uma série de intensas protuberâncias que se espalham à volta do limbo solar, na cromosfera. O vídeo mostra um time lapse de 200 imagens captadas durante cerca de 2 segundos. As imagens foram processadas individualmente sem serem empilhadas (stack), pelo que fiquei bastante impressionado com a qualidade obtida apenas com quadros únicos. A ISS é visível em branco na primeira sequência, por causa da técnica de inversão para processar a cromosfera com mais profundidade. A segunda sequência mostra a ISS em preto sem essa inversão visível.
Technical details | Detalhes Técnicos
LUNT LS100T Ha | AZ-HEQ5GT | Player One Astronomy Apollo-M Max and Player One Saturn-M SQR |Figueira da Foz, northern cost of Portugal. 02/06/2024 13h18m51s.
Important Note | Nota Importante: Never look and point a telescope or any other optical equipment directly to the sun without a proper and specialized safty filters! It can blind you forever. PT: Nota Importante – Nunca aponte um telescópio ou qualquer equipamento óptico directamente para o sol e observe através dele sem filtros especializados e seguros. Causará cegueira irreversível!
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International Space Station as Seen in H-alpha Crossing the Solar Disc
The image shows the International Space Station (ISS) silhouette while crossing the Sun´s disc at a distance of 436.29km from us at a speed of about 7.38km/s. The ISS completes an entire orbit around Earth each 90 minutes. Carrying on board astronauts, the large artificial satellite orbiting our planet with a width of 108.5 meters seems although very small when compared with the Solar disc with an angular size of 31.5′ is actually 29.2 times larger than the ISS in the moment of the passage. Hard to see it even with a special telescope equipped with Ha filters, only the fast video camera shutter set to an high speed frame rate could capture this rare moment that happens in a blink of an eye, as it was seen from Redondo, Dark Sky® Alqueva Reserve, Portugal, on June 6, 2021, at 13h20m11s (UT 12h20m11s) with a total duration of only 0,55 seconds. Its very interesting to recognise on the picture the ISS structure with the solar panels and main body elements well distinct. The image also shows in great detail, spicules and supergranulation in the surface of the Sun. Granules, as well as sunspots, appear in a layer we call the Photosphere (sphere of light). Being from this same surface that emerges all the light we visually see, leaving our star, it is involved in the Chromosphere (sphere of color), which is the place where we can observe gas filaments visible on the image and solar Prominences, where Solar Flares do occur. With a diameter of 1,392,000 km, our Sun is composed of 73% Hydrogen, 25% Helium and 2% from heavier elements. The image is also featuring many prominences spread around the solar limb, in the Chromospher.
PT: A imagem revela a silhueta da Estação Espacial Internacional (ISS) atravessando o sol a uma distância de 436.29km de nós e uma velocidade média de cerca de 7.38km/s. A ISS completa uma órbita em torno da Terra a cada 90 minutos. Transportando a bordo vários astronautas, este grande satélite artificial com uma envergadura de 108,5 metros parece muito pequeno quando comparado com o disco solar com um tamanho angular de 31,5 ‘ é na verdade 29,2 vezes maior do que a ISS no momento da passagem. Difícil de observá-la mesmo com um telescópio especial equipado com filtros de protecção H-alfa, só o obturador da câmara de vídeo numa sequência de disparos rápidos tem a capacidade de captar e eternizar este momento raro que acontece num um piscar de olhos, com a curta duração de apenas 0.55 segundos, como foi visto a partir do Redondo, no Dark Sky® Alqueva, Portugal, a 6 de junho de 2021, às 13h20m11s (UT 12h20m11s). Na fotografia é possível reconhecer a estrutura da ISS com os seus painéis solares e os elementos que compõem o corpo principal. A imagem também mostra a superfície supergranulada do Sol e repleta de espículas em grande detalhe. Os grânulos assim como as manchas solares, aparecem numa camada a que chamamos a Fotosfera (esfera de luz). Sendo desta mesma superfície que emerge toda a luz que vemos sair visualmente da nossa estrela, está envolta na Cromosfera (esfera de cor), sendo o local onde podemos observar Filamentos de Gás como os que são visíveis na imagem e Protuberâncias Solares, ou Proeminências, regiões onde ocorrem as chamadas “explosões solares”. Com um diâmetro de 1.392.000 km, o nosso Sol é composto por 73% de Hidrogénio, 25% de Hélio e 2% de elementos mais pesados. A imagem captada a partir do meu terraço, revela assim uma série de intensas protuberâncias que se espalham à volta do limbo solar, na cromosfera.
Technical details | Detalhes Técnicos
LUNT LS100T Ha | AZ-HEQ5GT | ASI178MC | Stack of 250 frames in very good seeing conditions for the solar surface and prominences, plus the single frames where the ISS has appeared. Redondo, Dark Sky® Alqueva, Portugal. 06/06/2021 13h20m11s.
ISS Details | Detalhes da ISS:
ISS angular size: 63.33″; distance: 436.29 km
Angular separation: 0.6′; azimuth: 173.5°; altitude: 73.9°
Center line distance: In the center; visibility path width: 4.11 km
R.A.: 04h 59m; Dec: +22° 41′; parallactic angle: 5.5°
ISS velocity: 57.6 ′/s (angular); 7.31 km/s (transverse)
ISS velocity: -1.07 km/s (radial); 7.38 km/s (total);
Direction of motion relative to zenith: 57.1°
Sun angular size: 31.5′; 29.2 times larger than the ISS
ISS Lunar Transit over a Waxing Gibbous Moon
The image shows a sequence of the ISS – International Space Station – crossing the moon’s disc during the twilight over Dark Sky® Alqueva Observatory in Cumeada region, Reguengos, Portugal, on March 23, 2021 at UT 17h43m. In the background, a detailed Waxing Gibbous Moon features a surface 70% directly illuminated by the Sun and spread by contrasted craters. The path which comprises 29 frames with the ISS visible, seems to cross very close to the well known Tycho crater, with a diameter of 86km. Carrying on board astronauts, the large artificial satellite orbiting our planet with a width of 108.5 meters seems although very small when compared with the moon’s disc with an angular size of 31.2′. Indeed, the moon was 35.7 times larger than the ISS during this particular passage. Although, larger structures and the main solar panels are well possible to distinguish in the image. The angular size of the ISS was 52.42″ arc seconds at a distance of 526,67 km and a speed of 7,39km/s, it has just crossed the moon in a blink of an eye during 0.69s. International Space Station (ISS) completes an entire orbit around Earth each 90 minutes, but these events are not happening so often. To capture this scene, I´ve used a ZWO ASI178MC planetary camera in full resolution at 21 frames per second, with a telescope Takahashi FSQ-106ED + Extender-Q 1.6x (840mm) on a mount EM-200.
PT: A imagem revela uma sequência da ISS – Estação Espacial Internacional – cruzando o disco da lua Crescente Gibosa sobre o Observatório do Dark Sky® Alqueva, na Cumeada, Reguengos, Portugal, no dia 23 de Março de 2021 às 17h43m UT. Em pano de fundo, uma lua detalhada apresenta uma superfície 70% iluminada directamente pelo sol e repleta de crateras contrastantes. A linha que descreve a passagem da ISS, e que compreende 29 fotografias captadas em modo sequencial, passa próximo da conhecida cratera Tycho, com um diâmetro de 86km. Transportando a bordo astronautas em permanência, o maior satélite artificial a orbitar o nosso planeta Terra, tem uma largura de 108,5 metros, embora pareça muito pequeno quando comparado com disco lunar com um tamanho angular de 31,2′ (minutos de arco). Na verdade, a lua encontrava-se 35,7 vezes maior do que a ISS durante esta passagem em particular. Porém, as maiores estruturas e os painéis solares principais são bem possíveis de distinguir na imagem. Com o tamanho angular de 52,42″ (segundos de arco), a ISS passou a uma distância de 526,67 km e uma velocidade de 7,39 km/s, cruzando a lua num piscar de olhos, durante cerca de 0,69 segundos. A Estação Espacial Internacional (ISS) completa uma órbita inteira ao redor da Terra a cada 90 minutos, mas eventos como este não acontecem com tanta frequência. Para captar esta imagem, usei uma c^mara planetário ZWO ASI178MC na máxima resolução e a 21 frames por segundo, com um telescópio Takahashi FSQ-106ED + Extender-Q 1.6x (840mm) numa montagem EM-200.
Above is available the ISS footage captured with the ZWO ASI178MC camera and below, the portrait version of the still image which comprises all the 29 frames of the ISS sequence.
PT: Acima é possível ver o vídeo captado pela ZWO ASI178MC e abaixo, uma versão em modo retrato da imagem final que compila os 29 frames da sequência.
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Close-up View of ISS Flying Over the Sky of Alqueva
The image above is the result of a stack of 54 images of the International Space Station ISS, with a tracking of the telescope made it in manually mode (by hand) while the ISS was crossing the sky above Dark Sky® Alqueva Observatory in Portugal, on April 4, 2021, at UT19h35m. Captured during the twilight with a Meade LX200 12″ with a ZWO ASI 174MC camera, at a speed of 158 fps. The final video had more than 27.000 frames, which means that the video below is a compilation of the best 559 frames, where the ISS could be spotted somewhere in the field of view, showing the ISS after being centred and stabilised for a more appealing view without shaking and some bumps due to the hand tracking. Interesting to notice the color in the some details as well as some nice structures of the ISS. The shape of Columbus Orbital facility seems to be visible and possibly the Crew-1 Dragon docked in the Node 2. Although I don’t have sure, maybe someone with more experience in hunting the ISS could confirme. You can try by yourself in the 3D ISS model.
PT: A imagem acima é o resultado de um stack de 54 fotogramas da Estação Espacial Internacional ISS, com o seguimento do telescópio feito em modo manual (à mão) enquanto a ISS cruzava o céu acima do Observatório do Dark Sky® Alqueva, na Cumeada, em 4 de abril de 2021 às 19h35m UT. Captado durante o crepúsculo com um Meade LX200 12″ e uma câmara planetária ZWO ASI174MC a uma velocidade de 158 fps. O vídeo original registou mais de 27.000 frames, o que significa que o vídeo abaixo é uma compilação dos melhores 559 fotogramas, onde a ISS conseguiu ficar visível num dado momento dentro do campo de visão do sensor. A imagem foi assim centralizada e estabilizada para uma visão mais atraente sem saltos abruptos e solavancos devido ao seguimento manual. Interessante de notar a cor em alguns detalhes, bem como algumas estruturas visíveis como o que parece ser o módulo Columbus Orbital facility e possivelmente o Crew-1 Dragon acoplado ao Node 2 da Estação Espacial. De referir no entanto, que eu não tenho a certeza se as estruturas que se vêem são as mesmas que aqui menciono, talvez alguém com mais experiência em seguir a ISS nos céus o possa confirmar. Talvez o leitor queira tentar por si mesmo identenficiar algumas destas estruturas, com o modelo 3D da Nasa disponível aqui.
ISS Crossing the Entire Sky and the Moon in a Fish-eye Full Dome Scene
The image shows a fish-eye full dome sequence of the ISS – International Space Station – crossing the entire sky while transiting in front of the crescent moon over Borba region, in Alentejo, Portugal, on 18th January 2021 at UT 19h14m41s. In the background, a moonlight starry sky shows the path of the brightest winter constellations while in the top edge is visible the faint dragged light of Milky Way. In the foreground, shines my septup with telescope and cameras pointing high, while I was enjoying and registering in a close-up view, this rare transit of the ISS against the moon. Below is available a close-up sequence and a time lapse video captured during this event. Click on each image below to entering in each dedicated page.
PT: A imagem revela uma sequência captada com uma lente fish-eye circular (180º) da ISS – Estação Espacial Internacional – cruzando ao longo do céu enquanto transitou em frente à lua crescente sobre a região de Borba, no Alentejo, Portugal, a 18 de janeiro de 2021 pelas 19h14m41s UT. Em pano de fundo, um céu estrelado ao luar revela o caminho das constelações de inverno mais brilhantes, enquanto no topo é visível a luz fraca e arrastada da Via Láctea. Em primeiro plano, reluz o meu setup composto por um telescópio e uma câmara apontada para o alto, enquanto desfrutava e registava em close-up este raro trânsito da Estação Espacial em frente à lua. Em baixo é possível aceder a uma imagem close-up e a uma sequência video time lapse captada durante este evento. Click em cada imagem para aceder à respectiva página.
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You can choose the best style of print do you preffer to decorate in a fashion way your walls. Metal Prints with durable and vivid colors, Acrylic, Canvas or the highest quality Gallery Print – a 6 colour UV direct printing on acrylic glass (2mm) including light colours and reinforced by an aluminium dibond plate (3mm). Those type of Prints can highlight the final work in an artistic way, showing the photograph as a piece of art. I work with two high quality specialized Labs in US and in Europe, using Kodak Professional Endura Premier Metallic papers and Fujifilm Crystal Archive DP II Professional. You can select the image above or freely navigate to more than 800 photographs available in my gallery – each one with their own story and magic – and choose the photograph you would love to have in your home or office.
How to Order – Simple and easy, just “copy and paste” the link of this page or the image you choosed and fill it in the form below, with the size you want and any detail you wish to include on the message, like your country, name and postal address. Free Shipping included to all prints (except frames). For US and Europe the delivery is 4-8 working days, while to Portugal and Spain is normally 2-6 working days. After submitting the order through the form, I will contact you for the payment method (Paypal available or bank transfer) and with other questions related to your print(s) or requests. Once payment is confirmed, your order is shipped within 24h. In case you wish, I can send you separtely with no additional cost, a postcard autographed and numbered of the same image you have just bought, as a seal and proof of art work authenticity from the author. Let me know what is your wish.
ISS Crossing a Moon Full of Craters – Photo and Video
The image and video sequence shows the ISS – International Space Station – crossing the crescent moon disc over Borba region, in Alentejo, Portugal, on 18th January 2021 at UT 19h14m41s. In the background, a detailed moon features a surface 30% directly illuminated by the sun and spread by contrasted craters. Carrying on board 7 astronauts from the Expedition 64, the large artificial satellite orbiting our planet with a width of 108.5 meters seems although very small when compared with the moon´s disc with an angular size of 31.2′. Indeed, the moon was 42.3 times larger than the ISS during this particular passage. Although, larger structures and the main solar panels are well possible to distinguish in the image. The angular size of the ISS was 43.10″ arc seconds at a distance of 644 km and a speed of 7,38km/s, it has just crossed the moon in a blink of an eye during 1.10s. International Space Station (ISS) completes an entire orbit around Earth each 90 minutes, but these events are not happening so often. To see more images of this event and an all sky fish-eye scene with ISS crossing the entire sky, Click here.
PT: A imagem e sequencia video revelam a ISS – Estação Espacial Internacional – cruzando o disco da lua crescente sobre a região de Borba, no Alentejo, Portugal, no dia 18 de janeiro de 2021 às 19h14m41s UT. Em pano de fundo, uma lua detalhada apresenta uma superfície 30% iluminada directamente pelo sol e repleta de crateras contrastantes. Transportando a bordo 7 astronautas da Expedição 64, o maior satélite artificial a orbitar o nosso planeta Terra, tem uma largura de 108,5 metros, embora pareça muito pequeno quando comparado com disco lunar com um tamanho angular de 31,2′ (minutos de arco). Na verdade, a lua encontrava-se 42,3 vezes maior do que a ISS durante esta passagem em particular. Porém, as maiores estruturas e os painéis solares principais são bem possíveis de distinguir na imagem. Com o tamanho angular de 43,10″ (segundos de arco), a ISS passou a uma distância de 644 km e uma velocidade de 7,38 km/s, cruzando a lua num piscar de olhos, durante cerca de 1,10 segundos. A Estação Espacial Internacional (ISS) completa uma órbita inteira ao redor da Terra a cada 90 minutos, mas eventos como este não acontecem com tanta frequência. Para ver mais imagens desta noite e uma fotografia fish-eye all sky da ISS a cruzar o céu inteiro, clique aqui.
Technical details | Detalhes Técnicos
GSO8″ | AZ-HEQ5GT | ASI178MC | The still image is a stack of 200 frames for the moon, plus a stack of 3 frames for the ISS, to increase quality and help reveal more details in the structure. The video sequence is a result of 11 best frames featuring the ISS.
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Buy a Fine Art Print or Wall Decor of this Image – Make your order Now!
You can choose the best style of print do you preffer to decorate in a fashion way your walls. Metal Prints with durable and vivid colors, Acrylic, Canvas or the highest quality Gallery Print – a 6 colour UV direct printing on acrylic glass (2mm) including light colours and reinforced by an aluminium dibond plate (3mm). Those type of Prints can highlight the final work in an artistic way, showing the photograph as a piece of art. I work with two high quality specialized Labs in US and in Europe, using Kodak Professional Endura Premier Metallic papers and Fujifilm Crystal Archive DP II Professional. You can select the image above or freely navigate to more than 800 photographs available in my gallery – each one with their own story and magic – and choose the photograph you would love to have in your home or office.
How to Order – Simple and easy, just “copy and paste” the link of this page or the image you choosed and fill it in the form below, with the size you want and any detail you wish to include on the message, like your country, name and postal address. Free Shipping included to all prints (except frames). For US and Europe the delivery is 4-8 working days, while to Portugal and Spain is normally 2-6 working days. After submitting the order through the form, I will contact you for the payment method (Paypal available or bank transfer) and with other questions related to your print(s) or requests. Once payment is confirmed, your order is shipped within 24h. In case you wish, I can send you separtely with no additional cost, a postcard autographed and numbered of the same image you have just bought, as a seal and proof of art work authenticity from the author. Let me know what is your wish.
International Space Station Crossing the Crescent Moon
The image shows a sequence of the ISS – International Space Station – crossing the crescent moon disc over Borba region, in Alentejo, Portugal, on 18th January 2021 at UT 19h14m41s. In the background, a detailed moon features a surface 30% directly illuminated by the sun and spread by contrasted craters. Carrying on board 7 astronauts from the Expedition 64, the large artificial satellite orbiting our planet with a width of 108.5 meters seems although very small when compared with the moon´s disc with an angular size of 31.2′. Indeed, the moon was 42.3 times larger than the ISS during this particular passage. Although, larger structures and the main solar panels are well possible to distinguish in the image. The angular size of the ISS was 43.10″ arc seconds at a distance of 644 km and a speed of 7,38km/s, it has just crossed the moon in a blink of an eye during 1.10s. International Space Station (ISS) completes an entire orbit around Earth each 90 minutes, but these events are not happening so often. To capture this scene, I´ve used a Nikon D810a at full speed (6 frames per second) and Sigma Sport lens at 600mm, plus a 1,4x converter (850mm) and a sensor cropped to a factor of 1,5x with a portable mount star adventure to track the moon permanently. ISO 800 and 1/400s of exposure.
PT: A imagem revela uma sequência da ISS – Estação Espacial Internacional – cruzando o disco da lua crescente sobre a região de Borba, no Alentejo, Portugal, no dia 18 de janeiro de 2021 às 19h14m41s UT. Em pano de fundo, uma lua detalhada apresenta uma superfície 30% iluminada directamente pelo sol e repleta de crateras contrastantes. Transportando a bordo 7 astronautas da Expedição 64, o maior satélite artificial a orbitar o nosso planeta Terra, tem uma largura de 108,5 metros, embora pareça muito pequeno quando comparado com disco lunar com um tamanho angular de 31,2′ (minutos de arco). Na verdade, a lua encontrava-se 42,3 vezes maior do que a ISS durante esta passagem em particular. Porém, as maiores estruturas e os painéis solares principais são bem possíveis de distinguir na imagem. Com o tamanho angular de 43,10″ (segundos de arco), a ISS passou a uma distância de 644 km e uma velocidade de 7,38 km/s, cruzando a lua num piscar de olhos, durante cerca de 1,10 segundos. A Estação Espacial Internacional (ISS) completa uma órbita inteira ao redor da Terra a cada 90 minutos, mas eventos como este não acontecem com tanta frequência. Para captar esta imagem, usei uma Nikon D810a na máxima velocidade (6 fotografmas por segundo) e uma lente Sigma Sport de 600 mm, com um conversor de 1,4x (850 mm) e um factor crop de 1,5x aplicado. Foi ainda usada uma montagem portátil, Star Adventure, afim de garantir o seguimento permanente da Lua. ISO 800 e exposição de 1/400s.
Below is available a time lapse video and a circular fish-eye image captured during this event. Click on each image below to entering in each dedicated page.
PT: Em baixo é possível aceder a uma sequência video time lapse e a uma imagem circular fish-eye captada durante este evento. Click em cada imagem para aceder à respectiva página.
BUY THIS PRINT | COMPRAR ESTA IMPRESSÃO
Buy a Fine Art Print or Wall Decor of this Image – Make your order Now!
You can choose the best style of print do you preffer to decorate in a fashion way your walls. Metal Prints with durable and vivid colors, Acrylic, Canvas or the highest quality Gallery Print – a 6 colour UV direct printing on acrylic glass (2mm) including light colours and reinforced by an aluminium dibond plate (3mm). Those type of Prints can highlight the final work in an artistic way, showing the photograph as a piece of art. I work with two high quality specialized Labs in US and in Europe, using Kodak Professional Endura Premier Metallic papers and Fujifilm Crystal Archive DP II Professional. You can select the image above or freely navigate to more than 800 photographs available in my gallery – each one with their own story and magic – and choose the photograph you would love to have in your home or office.
How to Order – Simple and easy, just “copy and paste” the link of this page or the image you choosed and fill it in the form below, with the size you want and any detail you wish to include on the message, like your country, name and postal address. Free Shipping included to all prints (except frames). For US and Europe the delivery is 4-8 working days, while to Portugal and Spain is normally 2-6 working days. After submitting the order through the form, I will contact you for the payment method (Paypal available or bank transfer) and with other questions related to your print(s) or requests. Once payment is confirmed, your order is shipped within 24h. In case you wish, I can send you separtely with no additional cost, a postcard autographed and numbered of the same image you have just bought, as a seal and proof of art work authenticity from the author. Let me know what is your wish.
ISS Crosses the Sky above Prehistoric Paintings of Pala Pinta Rock Shelter
The image reveals a starry trailed sky while the International Space Station ISS was crossing the background sky in front of Pala Pinta rock shelter in Alijó, in the newly created Dark Sky Vale do Tua. Experts believe that this paintings can date back to the Chalcolithic (Copper Age), and they invoke the real sighting of a comet, thus being able to constitute the oldest human record of an astronomical event of this type. According to an article published in May 2014 issue of National Geographic Portugal, “the search for a suspicious comet constituted Tiago Pessoa’s master’s work. Accepting Paulo Lima’s conjectures as valid and based on the orbital parameters of comets known, mathematically reversed their orbits, taking into account the window of the firmament that can be seen from the shelter, and identified more than a thousand comets that would pass through there, in the defined chronological interval: from 5500 BC to year 0 – an extended period due to the inexistence of a reference date for the paintings. “Excluding those where there is no information about their absolute magnitudes (brightness), I reached 680 comets. Finally, I identified four suspects: the comet Kowal-Vavrova, visible under the sky from the shelter for 59 days in 1421 BC, comet Biela, visible for 63 days in 2365 BC, comet Väisälä 1 visible for 61 days in 3784 BC and comet P / 2004 VR8 which, en among all, is the one whose trajectory is most similar to that inferred from the paintings of the shelter that will have remained visible for 143 days in 4626 B.C. ”, says Tiago Pessoa.” However, it could have been one of these four comets, but may also have been another that we do not know or that is even extinct. Currently, the thesis has been proposed that the engravings allude to the real sighting of a comet.
PT: A imagem revela um céu estrelado arrastado enquanto a Estação Espacial Internacional ISS cruza o céu em frente ao abrigo rupestre de Pala Pinta, em Alijó, no recém criado Dark Sky Vale do Tua. Especialistas acreditam que estas gravuras poderão remontar ao Calcolítico (Idade do Cobre), e que as mesmas fazem a invocação ao real avistamento de um cometa, podendo assim constituir o mais antigo registo humano de um evento astronómico deste tipo. De acordo com um artigo publicado na edição de Maio de 2014, na revista National Geographic Portugal, “a procura de um cometa suspeito constituiu o trabalho de mestrado de Tiago Pessoa. Aceitando como válidas as conjecturas de Paulo Lima e baseando-se nos parâmetros orbitais dos cometas conhecidos, reverteu matematicamente as suas órbitas, tendo em conta a janela do firmamento que se avista do abrigo, e identificou mais de mil cometas que por aí transitariam no intervalo cronológico definido: de 5500 a.C. ao ano 0 – um período alargado em virtude da inexistência de uma datação de referência para as pinturas. “Desses, excluindo aqueles onde não há informação sobre as suas magnitudes absolutas (brilho), cheguei a 680 cometas. Identifiquei, por fim, quatro suspeitos: o cometa Kowal-Vavrova, visível sob o céu do abrigo por 59 dias em 1421 a.C., o cometa Biela, visível por 63 dias em 2365 a.C., o cometa Väisälä 1 visível por 61 dias em 3784 a.C. e o cometa P/2004 VR8 que, entre todos, é aquele cuja trajectória mais se assemelha à inferida a partir das pinturas do abrigo que se terá mantido visível por 143 dias em 4626 a.C.”, refere Tiago Pessoa.” No entanto, apesar de pode ter sido um destes quatro cometas, também poderá ter sido outro que não conhecemos ou que até já se encontre extinto. Actualmente, já foi proposta a tese de que as gravuras aludem ao real avistamento de um cometa.
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How to Order – Simple and easy, just “copy and paste” the link of this page or the image you choosed and fill it in the form below, with the size you want and any detail you wish to include on the message, like your country, name and postal address. Free Shipping included to all prints (except frames). For US and Europe the delivery is 4-8 working days, while to Portugal and Spain is normally 2-6 working days. After submitting the order through the form, I will contact you for the payment method (Paypal available or bank transfer) and with other questions related to your print(s) or requests. Once payment is confirmed, your order is shipped within 24h. In case you wish, I can send you separtely with no additional cost, a postcard autographed and numbered of the same image you have just bought, as a seal and proof of art work authenticity from the author. Let me know what is your wish.
International Space Station Crossing a Solar Prominence
Our Sun is now entering in a relatively quiet cycle of 11 years, featuring only a small sunspot, but an interesting group of prominences in the upper limb of suns disk, this image shows some extra activity, with the dark silhouette of ISS crossing the sun´s disc at a distance of 426km from us and a speed of about 28,000km/h, the International Space Station (ISS) completes an entire orbit around Earth each 90 minutes. This large artificial satellite with a width of 108.5 meters seems although very small when compared with the Solar disc with an angular size of 31.5′ is actually 29.2 times larger than the ISS in the moment of the passage. Hard to see it even with a special telescope equipped with Ha filters, only the camera shutter of a fast sequence of shots could capture this rare moment that happens in a blink of an eye, as it was seen from Mourão, Dark Sky® Alqueva Reserve, Portugal, on June 14, 2017, at 13h53m10s with a total duration of only 0,54 seconds. Its very interesting to recognise on the picture the ISS structure with the solar panels and main body well distinct, remembering that this celestial object have astronauts on board permanently, with a privileged view from our beautiful “Pale Blue Dot”.
PT: O nosso Sol encontra-se agora mum ciclo relativamente calmo de 11 anos, com apenas uma pequena mancha solar visível mas um interessante grupo de protuberâncias no limbo superior do disco, esta fotografia revela-nos alguma atividade incomum, com a silhueta escura da ISS atravessando o sol a uma distância de 426km de nós e uma velocidade média de cerca de 28,000 km/h, a Estação Espacial Internacional (ISS) completa uma órbita em torno da Terra a cada 90 minutos. Este grande satélite artificial com uma envergadura de 108,5 metros parece muito pequeno quando comparado com o disco solar com um tamanho angular de 31,5 ‘ é na verdade 29,2 vezes maior do que a ISS no momento da passagem. Difícil de observá-la mesmo com um telescópio especial equipado com filtros de protecção Ha, só o obturador da câmara fotográfica numa sequência de disparos rápidos tem a capacidade de captar e eternizar este momento raro que acontece num um piscar de olhos, com a curta duração de apenas 0.54 segundos, como foi visto a partir de Mourão, Reserva Dark Sky® Alqueva, Portugal, em 14 de junho de 2017, às 13h53m10s. Na fotografia é possível reconhecer a estrutura da ISS com os seus painéis solares e o corpo principal bem distinto, lembrando que este objeto celestial tem astronautas a bordo em permanência com acesso a uma visão privilegiada do nosso “Pequeno Ponto Azul”.
Technical details | Detalhes Técnicos
LUNT LS100T Ha | AZ-HEQ5GT | Nikon D810a (DX) | F/7 | ISO1600 – Exp. 1/6400 | Median Sum of 80 images Disk + 80 images Solar Flares. Mourão, Dark Sky® Alqueva, Portugal. 14/06/2017 13h53m10s.
ISS Details | Detalhes da ISS:
ISS angular size: 64.80″; distance: 426 km
Angular separation: 1° 09′; azimuth: 196.2°; altitude: 73.5°
Center line distance: In the center; visibility path width: 3.93 km
R.A.: 05h 35m; Dec: +22° 25′; parallactic angle: -16.5°
ISS velocity: 58.1 ′/s (angular); 7.20 km/s (transverse)
ISS velocity: -1.63 km/s (radial); 7.39 km/s (total);
Direction of motion relative to zenith: -31.6°
Sun angular size: 31.5′; 29.2 times larger than the ISS
