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Old 25-12-2017, 02:26 AM
skysurfer's Avatar
skysurfer
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What colors of the stars do you see ?

Many textbooks, internet sites tell that e.g. Betelgeuse is red, Canopus is 'yellowish white', but what are the actual colors ?
It depends on the circumstances, how high is the object in the sky or even the observer.
When a star is low in the sky (< 10 degrees) the object turns redder, which is also the case with hazy air.

For example, the 'yellowish white' Canopus appears bluish white for me and 'white' Deneb just bluish white. Capella or Alpha Centauri appear indeed yellowish white to me, but in daylight more than at night. In daylight it is possibly the contrast to the blue sky background.
But the (much brighter) Sun appears just plain white.

What are your opinions ?
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Old 25-12-2017, 05:36 PM
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Tinderboxsky (Steve)
I can see clearly now ...

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I find my eyes give me quite a wide variation in apparent colours to those reported by others even after allowing for low elevation and othe variables.
Even just on your comments, I definitely cannot see any yellow in Alpha Centauri.
One of my enduring mysteries is Antares and its companion. Traditionally it is reported the companion looks greenish against Antares. But try as I might, I have not been able to see any hint of green on the many times I have observed the companion.
I quite enjoy picking out colour variation in double stars and othe multiple star systems and open clusters.

Last edited by Tinderboxsky; 25-12-2017 at 05:36 PM. Reason: Correction
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Old 12-01-2018, 07:11 PM
bigjoe (JOSEPH)
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Quote:
Originally Posted by Tinderboxsky View Post
I find my eyes give me quite a wide variation in apparent colours to those reported by others even after allowing for low elevation and othe variables.
Even just on your comments, I definitely cannot see any yellow in Alpha Centauri.
One of my enduring mysteries is Antares and its companion. Traditionally it is reported the companion looks greenish against Antares. But try as I might, I have not been able to see any hint of green on the many times I have observed the companion.
I quite enjoy picking out colour variation in double stars and othe multiple star systems and open clusters.
Had a look at this recently Steve ...Alpha Centauri A, B has some yellow to me, though not much and nearby ..

Beta Centauri A,B .. both definitely yellow /orange, though difficult to separate at 1.3".

Antares companion definite green to me many times ; did this in 5" Mak recently... tough more so than in a 6 inch doublet .Have not tried the colour contrasts in the 10 " reflector yet , or in a 91/4 SCT...Will see.

USED A 6mm and 3.5 DELOS and 3.2 TS ED..the latter more vibrant colours for an only $100 EP.
bigjoe.
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Old 15-01-2018, 05:43 PM
el_draco (Rom)
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Easy... go take a pick in the "Jewel Box" They are all there...
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Old 15-01-2018, 06:23 PM
bigjoe (JOSEPH)
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Originally Posted by el_draco View Post
Easy... go take a pick in the "Jewel Box" They are all there...
Or even the GEM cluster N3293 lots of White, Blue , Yellowish and Red Supergiants of mag 6.5...Located in Carina just above Crux...A fantastic cluster
bigjoe

Last edited by bigjoe; 15-01-2018 at 06:24 PM. Reason: Add
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