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Color Survey Gamma Delphini

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#1 asteroid7

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Posted 01 October 2007 - 02:16 PM

Mullaney calls this pair golden yellow & greenish-blue.
Haas calls this a grapefruit orange pair.
A few years ago I called this a yellow & blue pair in a Mak.
This time around, I see a bright, strong yellow pair

What colors do you see?

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  • 1878353-Gamma & STF 2725 (Delphinus).png


#2 Jeremy Perez

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Posted 01 October 2007 - 02:39 PM

Hi Rich, I saw Yellow and White for the Gamma Delphini pair...although A and F class stars usually give me fits with spurious color. If I observed it on a different night with a nice dinner of pasta resting in my gut, or the sound of coyotes yipping in the distance, I might end up seeing Mullaney's greenish-blue or something else on that secondary. Great sketch btw.

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  • 1878396-img2006072001_GammaDelph.jpg


#3 Cantankerously

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Posted 01 October 2007 - 02:49 PM

yellow green

#4 chrysalis

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Posted 01 October 2007 - 06:47 PM

Rich, I have always seen this pair as yellow and yellow, except one memorable night when I could have sworn the dimmer companion had a greenish tinge...

IF it ever clears here again, I'll check it out...

#5 SabiaJD

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Posted 02 October 2007 - 04:19 AM

I frequently showcase this star at public viewing nights. Did so last night. In the Clark refractor last night I did get a Yellow and blue-green color last night. I do want to qualify the sky was partly cloudy with patchy hazy in the sky. It was also on my local meridian ayt the time of observation.

#6 PJ Anway

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Posted 04 October 2007 - 01:22 PM

1)in my 80mm at 96X, I noted - yellow and blue.
2)Smyth - "yellow primary and a light emerald secondary"
3)Olcott - "a yellow primary and bluish-green secondary"
4)Flammarion - "orange and green"

The color difference is mentioned by Crossley in his "Handbook of Double Stars". He states that " B appears to vary in colour; it is given as yellow, green and blue, by different observers."

#7 JIMZ7

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Posted 05 October 2007 - 07:23 AM

It depends on what size scope you use. I usually see both golden stars. I sometimes have seen one of them with a light green color mixed-in.

#8 Rich (RLTYS)

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Posted 05 October 2007 - 10:26 AM

Rich

I've seen the two components as Pale Yellow and Greenish Blue. They should really be the same color. :question:

Clear Skies.
Rich (RLTYS)

#9 stevecoe

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Posted 05 October 2007 - 10:53 AM

I saw light yellow and very light blue in my old 13 inch at 100X on a great night.

Steve Coe

#10 chrysalis

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Posted 05 October 2007 - 01:16 PM

It's never gonna clear up here :( ...

#11 lunator

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Posted 05 October 2007 - 02:40 PM

I was viewing them last night and saw them as yellow but the primary had a warmer 'tint' to it.

I was viewing through an 8" newt & ortho eyepiece.

Cheers

ian

#12 chrysalis

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Posted 05 October 2007 - 08:39 PM

Tonight: 71X yellow and yellow with a hint of green or blue; 115X same colors; 500X (9mm Expanse + 3X Barlow) yellow and yellow-green.


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