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Observing >> Variable Star Observing and Radio Astronomy

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jgraham
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T Gem – 3/9/2013 1h56m UT – DSLR Photometry new
      #5731181 - 03/13/13 09:35 PM Attachment (25 downloads)

T Gem – 3/9/2013 1h56m UT
Telescope: Meade SC8 @ f/10, Orion Atlas EQ-G
Guider: Orion Deluxe Off-axis Guider, DSI Pro III, PHD
Camera: Canon Rebel T2i
Exposure: 10x60sec, ISO 800 saved as RAW
Darks: Internal
Flat: Synthetic
Software: Backyard EOS, Nebulosity, Deep Sky Stacker, Autostar Suite Image Processing, Photoshop

While R Gem is about to start fading from its most recent maximum T Gem is approaching its minimum at about magnitude 15. This is a good example of a long-period variable that I enjoy watching visually as they slowly fade, dropping out of sight for all but my largest telescopes, then gradually brightening to reappear and to eventually become the brightest star in the field, in this case reaching about magnitude 8, similar to R Gem. I also find it neat how T Gem stands out in this field as a tiny red ember and is the only red star in this frame.

Neat stuff.


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jgraham
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Reged: 12/02/04

Loc: Miami Valley Astronomical Soci...
Re: T Gem – 3/9/2013 1h56m UT – DSLR Photometry new [Re: jgraham]
      #5731183 - 03/13/13 09:35 PM Attachment (20 downloads)

This is the same image annotated with the magnitudes of selected reference stars based on the AAVSO reference chart (1071tyd).

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Astrodj
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Re: T Gem – 3/9/2013 1h56m UT – DSLR Photometry new [Re: jgraham]
      #5733385 - 03/15/13 01:37 AM

Wow, what a nice capture! The deep red color is exquisite. And it does appear as bright as the 14th magnitude star nearby.

Your image must reach down close to the 17th magnitude. Really striking!


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jgraham
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Re: T Gem – 3/9/2013 1h56m UT – DSLR Photometry [Re: Astrodj]
      #5734029 - 03/15/13 12:26 PM

17th magnitude is fairly typical for this type of exposure, but I gotta start working at it to go much fainter. The faintest that I've gone in the past was down around 18th, beyond that I start to get seriously skyglow limited.

Fun stuff...


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