by Ann » Sat Mar 06, 2021 6:23 am
Thank you, Si Ji Tario and Knight of Clear Skies, for your informative posts!
I was about to say something about this APOD, but I didn't get around to it. But I like it quite a lot.
It's fascinating that the two brightest-looking stars in the sky, Sirius and Canopus, are located so relatively close to one another - but I, in Sweden, can never see Canopus!
Canopus, an F-type star, looks interestingly blue. Yes, and it
is interestingly blue. Its B-V index is 0.16, which is bluer than well-known A-type star Altair of the Summer Triangle, not seen in this APOD. At least I can't find it. But I'm not sure of the faint blue and yellow stars seen below the tiny Earth in teh APOD.
Reddish Gum Nebula looks glorious next to Canopus. Can you see two small but distinctive-looking blue stars inside the Gum Nebula? They are Zeta Puppis (the topmost one) and Gamma Velorum (the bottom one). Both Zeta Puppis and Gamma Velorum are magnificent O-type stars, but
Gamma Velorum is a multiple star that also contains the nearest Wolf-Rayet star in the sky.
Ann
Thank you, Si Ji Tario and Knight of Clear Skies, for your informative posts! :D
I was about to say something about this APOD, but I didn't get around to it. But I like it quite a lot.
It's fascinating that the two brightest-looking stars in the sky, Sirius and Canopus, are located so relatively close to one another - but I, in Sweden, can never see Canopus!
Canopus, an F-type star, looks interestingly blue. Yes, and it [b][i]is[/i][/b] interestingly blue. Its B-V index is 0.16, which is bluer than well-known A-type star Altair of the Summer Triangle, not seen in this APOD. At least I can't find it. But I'm not sure of the faint blue and yellow stars seen below the tiny Earth in teh APOD.
Reddish Gum Nebula looks glorious next to Canopus. Can you see two small but distinctive-looking blue stars inside the Gum Nebula? They are Zeta Puppis (the topmost one) and Gamma Velorum (the bottom one). Both Zeta Puppis and Gamma Velorum are magnificent O-type stars, but [url=https://en.wikipedia.org/wiki/Gamma_Velorum]Gamma Velorum[/url] is a multiple star that also contains the nearest Wolf-Rayet star in the sky.
Ann