[AZ-Observing] Re: Delta Sco Fading

Thanks for the information on Del SCO.

I looked over the web site. There is a great scatter of data which is 
very surprising for such a bright star.

I assume the observers are using calibrated systems. The stars 
proposed as comparison stars, (Alpha SCO and Alpha ARA) are both 
variable stars and also Alpha SCO is not a good color match. Perhaps 
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


At 14:00 -0700 4/27/05, Tom Polakis wrote:
>Argentinian variable-star observer Sebastian Otero has noted that 
>Dschubba (Delta Scorpii) has been fading rapidly of late.  This is 
>the 2nd-magnitude star "at 2 o'clock from Antares" in the head of 
>the Scorpion.
>
>It brightened unexpectedly from its usual magnitude 2.2 by a half 
>magnitude late in 2002, and has fluctuated around magnitude 1.7 
>since.  In brightness it rivalled the rival of Mars.  Now it appears 
>to be fading back to its original level, but who knows for how long.
>
>More information on Otero's site at:
>
>http://ar.geocities.com/varsao/delta_Sco.htm
>
>The English version is about half way down the page.
>
>When I see Dschubba in print, it looks like a combination of the 
>unflattering nicknames for the current and most recent presidents: 
>Dubya + Bubba = Dschubba.  No?  Okay, maybe I've been working a bit 
>too hard lately.
>
>Tom

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

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