ISS Transiting the Sun´s Disc Over Portugal
Taken by Miguel Claro on June 6, 2017 @
Corroios, Almada, Portugal
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Details:
Our Sun is now entering in a relatively quiet cycle of 11 years, featuring only a shy group of sunspots AR2661, and a little solar flare in the lower right limb, this image shows some extra activity, with the dark silhouette of ISS crossing the sun´s disc at a distance of 770km 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 52.8 times larger than the ISS. 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 Corroios, Portugal, on June 6, 2017, at 17h36m11s with a total duration of only 1,05 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”.
Technical details | Detalhes Técnicos
LUNT LS100T Ha | AZ-HEQ5GT | Canon 6D | F/7 + Barlow2x | ISO1250 – Exp. 1/500 | Median Sum of 27 images. Corroios, Almada, Portugal. 06/06/2017 17h36m11s.
ISS Details | Detalhes da ISS:
ISS angular size: 42.32″; distance: 771 km
Angular separation: 7° 12′; azimuth: 277.3°; altitude: 29.3°
Center line distance: Close to; visibility path width: 7.67 km
R.A.: 04h 28m; Dec: +23° 00′; parallactic angle: -48.7°
ISS velocity: 26.1 ′/s (angular); 5.85 km/s (transverse)
ISS velocity: -4.47 km/s (radial); 7.36 km/s (total);
Direction of motion relative to zenith: -47.9°
Sun angular size: 31.5′; 52.8 times larger than the ISS
Photographer's website:
http://www.miguelclaro.com
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