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Observing >> Variable Star Observing and Radio Astronomy

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jgraham
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Reged: 12/02/04

Loc: Miami Valley Astronomical Soci...
S Gem – 3/9/2013 1h14m UT – DSLR Photometry
      #5741879 - 03/18/13 09:57 PM Attachment (32 downloads)

Telescope: Meade SC8 @ f/10, Orion Atlas EQ-G
Guider: Orion Deluxe Off-axis Guider, DSI Pro III, PHD
Camera: Canon Rebel T2i
Exposure: 16x60sec, ISO 800 saved as RAW
Darks: Internal
Flat: Synthetic
Software: Backyard EOS, Nebulosity, Deep Sky Stacker, Autostar Suite Image Processing, Photoshop

Ack! It’s cloudy, been cloudy, nut’n but clouds in the forecast. Might as well post another image of a long-period variable near minimum. This is S Gem right around its most recent minimum at about magnitude 14.4. I really enjoy looking at the image on a good monitor. Like the image that I posted of T Gem, S Gem is a beautiful red ember, the only red star in the field. Now is a good time to start keeping an eye on S Gem as it has begun a relatively rapid rise in brightness that will peak somewhere between 8th and 9th magnitude. In modest size scopes it’ll slowly appear against the background sky eventually brightening to be comparable to the brightest stars in the field.


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jgraham
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Re: S Gem – 3/9/2013 1h14m UT – DSLR Photometry new [Re: jgraham]
      #5741882 - 03/18/13 09:58 PM Attachment (32 downloads)

This is the same image annotated with the magnitudes of selected reference stars based on the AAVSO reference chart (10814CFQ).

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Astrodj
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Loc: Missouri
Re: S Gem – 3/9/2013 1h14m UT – DSLR Photometry new [Re: jgraham]
      #5761600 - 03/28/13 12:27 AM

Very nice again, John. How long does this one take to rise to maximum? Hopefully still well placed for viewing then, eh?

Thanks for sharing!


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Hubert
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Loc: Belgium
Re: S Gem – 3/9/2013 1h14m UT – DSLR Photometry new [Re: Astrodj]
      #5762324 - 03/28/13 12:34 PM

According the bulletin 76 it will be at maximum around 30 may.

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jgraham
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Re: S Gem – 3/9/2013 1h14m UT – DSLR Photometry new [Re: Astrodj]
      #5762356 - 03/28/13 12:59 PM

It looks like it'll take about 3 months. S Gem does a fairly steady rise from minimum to maximum. Some of these pause about halfway up as they brighten, but not S Gem, so it'll be fun to watch... if the weather ever clears!

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