Betel­geuse set­ting

AMANDA CROSS, LAN­CASHIRE, 4 APRIL 2017

Sky at Night Magazine - - HOTSHOTS -

Amanda says: “This shot is made of a se­ries of sin­gle images taken 25 sec­onds apart, slightly out of fo­cus with a high ISO and a low shut­ter speed to pick out colour vari­a­tions. Our at­mos­phere re­fracts the star’s light just like a prism splits sun­light. When a star is close to the hori­zon we are look­ing at it through a thicker part of the at­mos­phere, which re­sults in more colour flashes that we can see. This im­age is sim­i­lar to Steve Brown’s win­ning en­try from IAPY 2016. I think we were both do­ing the same thing at the same time with Sir­ius be­cause we tweeted each other. Then I used the same tech­nique on some other stars to see the dif­fer­ence!”

Equip­ment: Canon EOS 7D Mk II DSLR cam­era, 300mm lens.

BBC Sky at Night Mag­a­zine says: “We have to give Amanda top marks for artis­tic cre­ativ­ity, for hav­ing the fore­sight to come up with the project and hav­ing the pa­tience and know-how to see it through!”

About Amanda: “I en­joy tak­ing images of ob­jects to present them in dif­fer­ent ways, or cap­tur­ing them over time to show how they change. I par­tic­u­larly like to take star trails and I also pho­to­graph the In­ter­na­tional Space Sta­tion. I’m a big fan of Star Trek and my love of as­tron­omy comes from my grand­dad, who had a tele­scope when I was grow­ing up.”

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