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Date: 24 Jul 2006 21:56:53
From: Stephen Paul
Subject: Delta Scorpii
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Is it me (of course not) or is Delta Scorpii less bright this year than
last?
I just stepped out to check the sky conditions and upon seeing Scorpius
got to thinking about something I thought I read about Delta being a
variable star.
Is it? And is it at or near minimum now? Or am I having poor recollection?
Stephen
Shirley, MA
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Date: 24 Jul 2006 21:32:12
From: canopus56
Subject: Re: Delta Scorpii
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"Stephen Paul" <smarshallpaul@gmail.com > wrote in message
news:xsWdnfII6MvD51jZnZ2dnUVZ_qudnZ2d@omcast.com...
>[I]s Delta Scorpii less bright this year than last?
Yes, it is about 1/2 magnitude dimmer since about 640 days ago at JD2453200.
The AAVSO does not give a fixed period for it.
From this page at the AAVSO -
http://www.aavso.org/data/
You can generate a light curve and look at recent data on delta Sco. Enter
"delta Sco" in the AAVSO search boxes. Generate an 800 day curve - see the
curve fitting green diamonds.
Light curve generator:
http://www.aavso.org/data/lcg/
Quick look recently observations:
http://www.aavso.org/cgi-bin/newql.pl?name=delta%20Sco&output=html
Sam gave you some description of this key type of long-period pulsating
variable star. The AAVSO has more info at:
http://www.aavso.org/observing/aids/typelist.txt
http://www.aavso.org/vstar/outline.shtml
- Canopus56
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Date: 25 Jul 2006 19:09:04
From: Stephen Paul
Subject: Re: Delta Scorpii
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canopus56 wrote:
> "Stephen Paul" <smarshallpaul@gmail.com> wrote in message
> news:xsWdnfII6MvD51jZnZ2dnUVZ_qudnZ2d@omcast.com...
>> [I]s Delta Scorpii less bright this year than last?
>
> Yes, it is about 1/2 magnitude dimmer since about 640 days ago at JD2453200.
> The AAVSO does not give a fixed period for it.
>
Thanks guys...
(I liked it better when it was brighter ;-).
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Date: 25 Jul 2006 03:04:37
From: Chris L Peterson
Subject: Re: Delta Scorpii
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On Mon, 24 Jul 2006 21:56:53 -0400, Stephen Paul
<smarshallpaul@gmail.com > wrote:
>Is it me (of course not) or is Delta Scorpii less bright this year than
>last?
Delta Scorpius is variable, but not with a fixed period. I recall
reading that it stopped brightening in 2005, so maybe now it is simply
dropping back down to the magnitude it has normally been at?
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
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Date: 25 Jul 2006 02:56:14
From: Sam Wormley
Subject: Re: Delta Scorpii
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Stephen Paul wrote:
> Is it me (of course not) or is Delta Scorpii less bright this year than
> last?
>
> I just stepped out to check the sky conditions and upon seeing Scorpius
> got to thinking about something I thought I read about Delta being a
> variable star.
>
> Is it? And is it at or near minimum now? Or am I having poor recollection?
>
> Stephen
> Shirley, MA
From Jim Kaler's http://www.astro.uiuc.edu/~kaler/sow/dschubba.html
Dschubba, usually a bright second magnitude star (previously measured
at 2.32) that is 400 light years away, is undergoing a remarkable
change. In July 2000, the star began to brighten, and during 2001 and
2002 began to close in on first magnitude as it turned itself into a
"B-emission" star rather like Gamma Cassiopeiae, one with a
surrounding disk produced in part by rapid rotation (which is at
least 181 kilometers per second at the equator, 90 times that of the
Sun).
Dschubba received Bayer's Delta designation, and originally in fifth
place in brightness it is close to the mark, but beat out not by Beta
(Graffias) and Gamma, but by Lambda (Shaula), Theta, Epsilon, and of
course Antares. Currently, the star is number two right after
Antares. Dschubba is also remarkable for its complexity, and is most
likely quadruple.
Some other interesting sources
http://www.mindspring.com/~feez/Star.htm
There are many light curves on line, but none that I saw for the last
two years.
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Date: 25 Jul 2006 03:20:25
From: Sam Wormley
Subject: Re: Delta Scorpii
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Sam Wormley wrote:
> Stephen Paul wrote:
>
>> Is it me (of course not) or is Delta Scorpii less bright this year
>> than last?
>>
>> I just stepped out to check the sky conditions and upon seeing
>> Scorpius got to thinking about something I thought I read about Delta
>> being a variable star.
>>
>> Is it? And is it at or near minimum now? Or am I having poor
>> recollection?
>>
>> Stephen
>> Shirley, MA
>
>
> From Jim Kaler's http://www.astro.uiuc.edu/~kaler/sow/dschubba.html
>
> Dschubba, usually a bright second magnitude star (previously measured
> at 2.32) that is 400 light years away, is undergoing a remarkable
> change. In July 2000, the star began to brighten, and during 2001 and
> 2002 began to close in on first magnitude as it turned itself into a
> "B-emission" star rather like Gamma Cassiopeiae, one with a
> surrounding disk produced in part by rapid rotation (which is at
> least 181 kilometers per second at the equator, 90 times that of the
> Sun).
>
> Dschubba received Bayer's Delta designation, and originally in fifth
> place in brightness it is close to the mark, but beat out not by Beta
> (Graffias) and Gamma, but by Lambda (Shaula), Theta, Epsilon, and of
> course Antares. Currently, the star is number two right after
> Antares. Dschubba is also remarkable for its complexity, and is most
> likely quadruple.
>
> Some other interesting sources
> http://www.mindspring.com/~feez/Star.htm
>
> There are many light curves on line, but none that I saw for the last
> two years.
AAVSO Quick Look Data
http://www.aavso.org/cgi-bin/newql.pl?name=delta%20sco&output=html
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Date: 25 Jul 2006 03:16:34
From: Sam Wormley
Subject: Re: Delta Scorpii
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Sam Wormley wrote:
> Stephen Paul wrote:
>
>> Is it me (of course not) or is Delta Scorpii less bright this year
>> than last?
>>
>> I just stepped out to check the sky conditions and upon seeing
>> Scorpius got to thinking about something I thought I read about Delta
>> being a variable star.
>>
>> Is it? And is it at or near minimum now? Or am I having poor
>> recollection?
>>
>> Stephen
>> Shirley, MA
>
>
> From Jim Kaler's http://www.astro.uiuc.edu/~kaler/sow/dschubba.html
>
> Dschubba, usually a bright second magnitude star (previously measured
> at 2.32) that is 400 light years away, is undergoing a remarkable
> change. In July 2000, the star began to brighten, and during 2001 and
> 2002 began to close in on first magnitude as it turned itself into a
> "B-emission" star rather like Gamma Cassiopeiae, one with a
> surrounding disk produced in part by rapid rotation (which is at
> least 181 kilometers per second at the equator, 90 times that of the
> Sun).
>
> Dschubba received Bayer's Delta designation, and originally in fifth
> place in brightness it is close to the mark, but beat out not by Beta
> (Graffias) and Gamma, but by Lambda (Shaula), Theta, Epsilon, and of
> course Antares. Currently, the star is number two right after
> Antares. Dschubba is also remarkable for its complexity, and is most
> likely quadruple.
>
> Some other interesting sources
> http://www.mindspring.com/~feez/Star.htm
>
> There are many light curves on line, but none that I saw for the last
> two years.
AAVSO Quick Look Data
http://www.aavso.org/cgi-bin/newql.pl?name=delta%20sco&output=html
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Date: 25 Jul 2006 14:48:27
From: Llanzlan Klazmon
Subject: Re: Delta Scorpii
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Stephen Paul <smarshallpaul@gmail.com > wrote in
news:xsWdnfII6MvD51jZnZ2dnUVZ_qudnZ2d@comcast.com:
> Is it me (of course not) or is Delta Scorpii less bright this year than
> last?
I am sure that it was brighter a couple of years ago. From what I have
read, its' outbursts are not periodic so I am not sure that minumum is the
right term - maybe you should say it is more or less back to normal.
Klazmon.
>
> I just stepped out to check the sky conditions and upon seeing Scorpius
> got to thinking about something I thought I read about Delta being a
> variable star.
>
> Is it? And is it at or near minimum now? Or am I having poor
> recollection?
>
> Stephen
> Shirley, MA
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