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CCD Images - Session 215 (2007-09-21)

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Objects Session Notes
Bullet Gliese 725 (HIP 91768) - Nearby Star
Bullet Astrometric & Photometric Monitoring
- SS Cyg (Dwarf Nova)
- BL Lac (Blazar)
- U Her (Mira variables)
- SZ Her (Variable)
- short session (1.5 hour duration) - sky conditions rapidly deteriorating towards end with cloud
- CCD operation of -20 degC (at 85% average cooling). 
- main objectives were to acquire images of selected variable stars and nearby stars for ongoing photometry and astrometry
-

Gliese 725 (HIP 91768) - Nearby Star,  11.39 light years

Gliese 725 (Draco)
a pair of red dwarf stars (Struve 2398)
 located 11.52 light years away
(15th closest star system to the Sun)

Image
Annoated CCD Image (50% size)
7 x 30s exposure (median combine),  1x1 binning,  C Filter
2007-09-21 21:08 hUT (#215066-72)

 

Gliese 725 - detail
showing A and B components
catalog separation 13 arc secs, PA 003 deg
measured separation 12.1 arc secs, PA 356 deg,

catalog proper motion -  A: 2.28 arc sec/year, B: 2.31 arc sec/year

Image
Annotated CCD Image (cropped)
30s exposure (median combine),  1x1 binning,  C Filter
2007-09-21 21:08 hUT (#215069)

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This Web Page: CCD Images - Session 215 (2007-09-21)
Last Updated : 2015-05-16
Site Owner : David Richards
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