First ISS Transit of Sun

[kirkster501]

From my Lunt 60Tha and ASI174MM about 4 miles from where I live in Nottingham at 15:05 this afternoon.  Very roughly processed.  I was not quite at exact diametric centre.

Edited June 12, 2021 by kirkster501

[TerryMcK]

Fantastic image

[Stephenstargazer]

Any idea why the ISS is not just a black shadow, as in transit of Mercury, Venus ?

[fwm891]

Earth shine ?

[Stephenstargazer]

Very likely, should have thought of that! Mind you with a solar filter that is still surprising. How about refraction?

[kirkster501]

I’m sure it’s some light reflected from the earth onto the dark side of the ISS. Hardly any processing done at all on this image. It’s just a stack of the aligned frames and some colorisation  applied to the solar disk.

[Rusted]

Adding artificial colouring often turns the umbra of sunspots brown.

[Stephenstargazer]

Could it also come from stacking? Check an individual frame and see what the ISS is like? I don't really believe earthshine given the miniscule transmission of a solar filter at ND 5. But that takes nothing away from a great photo!

2nd thought, what part of earthshine would be at H alpha wavelength? I just have a genuine interest in understanding what photos show, and what is artifact.

 

 

 

 

Edited June 13, 2021 by Stephenstargazer