by Ann » Mon Jul 02, 2018 8:43 am
BDanielMayfield wrote: ↑Mon Jul 02, 2018 6:45 am
Awesome spectacle! One question though, is Antares really that yellow? I'm used to seeing it appear red to my eyes.
Bruce
I can so rarely see Antares from my latitude, but I have observed Betelgeuse through a telescope many times. In my opinion, the "optical appearance" of Betelgeuse (and therefore probably of Antares) is golden-yellow. Admittedly, Antares looks almost lemon-yellow in today's APOD, which I think is a mistake. Then again, Antares is probably overexposed, which makes it look white. And the surrounding reflection nebula is indeed yellow.
I deeply, deeply admire Rogelio Bernal Andreo for his incredible wide-angle and terrifically detailed images -
his portrait of the Big Dipper and surrounding deep-sky objects simply blew me away.
In today's APOD, I think that the colors are not always "true". For example, Tau Scorpii, to the lower left of Antares, looks white to golden-white in this image. Tau Scorpii is really quite blue, and it typically looks blue in almost all RGB images.
In this APOD from 2015, Tau Scorpii (at right) looks very blue, while Antares looks downright white.
In this picture, however, Antares is certainly golden-yellow, and Tau Scorpii (at top) is a pale blue sapphire sitting in a ruby sea.
Ann
[quote=BDanielMayfield post_id=283748 time=1530513918 user_id=139536]
Awesome spectacle! One question though, is Antares really that yellow? I'm used to seeing it appear red to my eyes.
Bruce
[/quote]
I can so rarely see Antares from my latitude, but I have observed Betelgeuse through a telescope many times. In my opinion, the "optical appearance" of Betelgeuse (and therefore probably of Antares) is golden-yellow. Admittedly, Antares looks almost lemon-yellow in today's APOD, which I think is a mistake. Then again, Antares is probably overexposed, which makes it look white. And the surrounding reflection nebula is indeed yellow.
I deeply, deeply admire Rogelio Bernal Andreo for his incredible wide-angle and terrifically detailed images - [url=https://apod.nasa.gov/apod/ap110624.html]his portrait of the Big Dipper[/url] and surrounding deep-sky objects simply blew me away.
In today's APOD, I think that the colors are not always "true". For example, Tau Scorpii, to the lower left of Antares, looks white to golden-white in this image. Tau Scorpii is really quite blue, and it typically looks blue in almost all RGB images.
[url=https://apod.nasa.gov/apod/ap150706.html]In this APOD from 2015[/url], Tau Scorpii (at right) looks very blue, while Antares looks downright white. [url=https://www.skyandtelescope.com/wp-content/uploads/2017-06-28_5953e339a672e_antares2semajustes1-5Mini.jpg]In this picture[/url], however, Antares is certainly golden-yellow, and Tau Scorpii (at top) is a pale blue sapphire sitting in a ruby sea.
Ann