FreeLists / az-observing / [AZ-Observing] Re: Delta Sco Fading

[Jeff Hopkins <phxjeff@xxxxxxxxxxx>]

Yeah, you are right. That's too low for me.

I see the infrared gang suggest alpha2 LIB (Dec= -16). While it's a 
double star is should still work fine as the separation is great 
enough to be handled by the diaphragm size. That looks like it may be 
a better match, however the Yale Bright Star Catalog indicates it is 
a suspected variable too. If I can find some information on it, that 
may be the best comparison star assuming it is not significantly 
variable. BTW, most if not all stars vary. It's a matter of how much 
you can live with and the periods. Finding good comparison stars is 
the hardest and most important part of photometry.

Jeff

At 12:23 -0700 4/28/05, Tom Polakis wrote:
>Jeff Hopkins wrote:
>
>>  Alpha ARA maybe best. If I have some time I will see if I can find a
>>  good comparison star that is not variable and a good color match.
>>  I'll try to get some UBV and possible J/H band data.
>
>Jeff,
>
>Alpha Arae is at a declination of -50 degrees (Ara is that 
>constellation below Scorpius), so you might want to hunt around for 
>a more northerly comparison star.
>
>Tom

-- 
Jeff Hopkins
HPO SOFT
http://www.hposoft.com/Astro/astro.html

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