Comparing Star Colours

Comparing star colours of Rigel, Betelgeuse and Sirius, by Amanda Cross.

This mosaic of stars Rigel, Betelgeuse and Sirius was created by capturing images 60 seconds apart to compare the differences in colour, caused by Earth’s atmosphere splitting the starlight and the process being picked up by the DSLR camera. Credit: Amanda Cross

Amanda Cross


Canon 7D mk II 300mm lens

I took individual images of each star 60 seconds apart with ISO 16000 and speed 1/50, stacked them with StarStaX and presented them together to compare the differences in colours of the stars. The images are taken slightly out of focus to show the colours. The variations of colour are from the earth’s atmosphere which splits the light from the stars and the camera picks up the colour flashes.