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SleepIsWrong
sage
Reged: 12/07/05
Posts: 442
Loc: Baltimore, MD
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Here's a plot from last night's run looking at TT Ari. This is a very interesting star that I'm just learning about, having read an AAVSO "Variable Star of the Month" article earlier today. The observations were taken as part of the fall campaigne on this star for the Center for Backyard Astrophysics (CBA), but I see that the AAVSO has just issued an alert asking for observations of TT Ari during it's current low state.
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14" Celestron CGE (two of 'em)
Soupy, orange, mag 4. skies (woof!)
ST9-XE, ST8-XME
ssp-3 photometer
Mira Pro UE7 & ProScript, IDL v7.1, AIP4Win, MaxIm DL, TheSky6 Pro, PC-IRAF 2.14.1
Way too many white squares in the graphic, below
Edited by SleepIsWrong (10/20/09 11:06 PM)
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MtnGoat
Pooh-Bah
Reged: 02/18/07
Posts: 1212
Loc: Columbia Gorge, WA
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wow, is that cool. that would be something to see up close...not too close! What an unimagineable scene must be unfolding there when there's a magnitude jump in a few minutes...
very nice work. the bottom line is a reference star in the field?
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"Ignorant people think it's the noise which fighting cats make that is so aggravating, but it ain't so; it's the sickening grammar they use." Mark Twain
Edited by MtnGoat (10/21/09 12:36 AM)
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SleepIsWrong
sage
Reged: 12/07/05
Posts: 442
Loc: Baltimore, MD
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Quote:
the bottom line is a reference star in the field?
Yes - it's a star within an arcminute or so of TT Ari that I use as a comparison. The "ensemble" refers to the combined brightness of four other comparison stars. Both the variable star and comp#1 were compared to the ensemble magnitude - the latter as a control point to determine the likely photometric precision of the data. A standard deviation of 0.014 magnitudes isn't all that great - but it's often what we get here at the bottom of the east coast soup (elevation = 57 meters).
Mike
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14" Celestron CGE (two of 'em)
Soupy, orange, mag 4. skies (woof!)
ST9-XE, ST8-XME
ssp-3 photometer
Mira Pro UE7 & ProScript, IDL v7.1, AIP4Win, MaxIm DL, TheSky6 Pro, PC-IRAF 2.14.1
Way too many white squares in the graphic, below
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RLTYS
Carpal Tunnel
Reged: 12/18/04
Posts: 2137
Loc: New York (Long Island)
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Excellent work. Thanks for the view.
Rich (RLTYS)
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10" F4.8 Refl.
4" F5 Refr. (Genesis)
3" F4 Celestron FirstScope
50mm F12 Refr. (Tasco #6TE-5)
12x63 and 10x50 Binoculars.
"I want to do more then just look."
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MtnGoat
Pooh-Bah
Reged: 02/18/07
Posts: 1212
Loc: Columbia Gorge, WA
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what software are you running for analysis?
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"Ignorant people think it's the noise which fighting cats make that is so aggravating, but it ain't so; it's the sickening grammar they use." Mark Twain
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Hubert
super member
Reged: 09/26/06
Posts: 122
Loc: Belgium
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I have observed TT Ari for more than 10 years visually on many clear nights and always have seen it around mag 11. Now that's finally dropped its cloudy here for quite a while. 
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SleepIsWrong
sage
Reged: 12/07/05
Posts: 442
Loc: Baltimore, MD
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Quote:
what software are you running for analysis?
I use Mira Pro. I've written a number of scripts in Lua, which is what the ProScript interface is written in. I live under very bright skies and so need to include as little sky in my photometry apertures as possible. That means really tight star apertures (to keep s/n as high as possible) requiring accurate position, fwhm, and ellipticity information for each image. Mira has all the tools to do that - but those tools are scattered around a bit in the software, so I wrote a bunch of scripts that pull a lot of it together.
Once the photometric reductions are done I use Excel to organize the data and then plot it using DPlot.
Mike
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14" Celestron CGE (two of 'em)
Soupy, orange, mag 4. skies (woof!)
ST9-XE, ST8-XME
ssp-3 photometer
Mira Pro UE7 & ProScript, IDL v7.1, AIP4Win, MaxIm DL, TheSky6 Pro, PC-IRAF 2.14.1
Way too many white squares in the graphic, below
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SleepIsWrong
sage
Reged: 12/07/05
Posts: 442
Loc: Baltimore, MD
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Here are data from the pst two nights (Oct 20/21 and Oct 21/22) On both nights I was dodging clouds and on the second night there was slowly thickening cirrus.
Mike
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14" Celestron CGE (two of 'em)
Soupy, orange, mag 4. skies (woof!)
ST9-XE, ST8-XME
ssp-3 photometer
Mira Pro UE7 & ProScript, IDL v7.1, AIP4Win, MaxIm DL, TheSky6 Pro, PC-IRAF 2.14.1
Way too many white squares in the graphic, below
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SleepIsWrong
sage
Reged: 12/07/05
Posts: 442
Loc: Baltimore, MD
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And....
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14" Celestron CGE (two of 'em)
Soupy, orange, mag 4. skies (woof!)
ST9-XE, ST8-XME
ssp-3 photometer
Mira Pro UE7 & ProScript, IDL v7.1, AIP4Win, MaxIm DL, TheSky6 Pro, PC-IRAF 2.14.1
Way too many white squares in the graphic, below
Edited by SleepIsWrong (10/22/09 09:33 PM)
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ido
sage
Reged: 06/29/06
Posts: 366
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Lovely ! Can you post one of the images as well ?
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http://bareket-astro.com/en.htm
Bareket observatory, Israel.
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SleepIsWrong
sage
Reged: 12/07/05
Posts: 442
Loc: Baltimore, MD
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Here's an image of the field - TT Ari is marked. In this image TT Ari is around V=16.6 - faintest stars in the image are around 19th.
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14" Celestron CGE (two of 'em)
Soupy, orange, mag 4. skies (woof!)
ST9-XE, ST8-XME
ssp-3 photometer
Mira Pro UE7 & ProScript, IDL v7.1, AIP4Win, MaxIm DL, TheSky6 Pro, PC-IRAF 2.14.1
Way too many white squares in the graphic, below
Edited by SleepIsWrong (11/18/09 11:45 PM)
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