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CCD Images - Session 281 (2008-04-14)

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Objects Session Notes
V2491 Cyg - nova
Astrometric & Photometric Monitoring
  - U Gem (dwarf nova)
- SS Her, U Her (mira variable)
- KR Aur, AQ CMi, AV CMi, AM CVn, AM Her, RZ LMi, 
- CY Lyr, U Mon, DY Per, ER UMa (variables)
- V2491 Cyg (nova)

 
- Evening session (4.1hr)
- CCD operation of -25 degC 
(at 66% average cooling). 
- main objective was to acquire images of certain selected stars for ongoing photometric and astrometric analysis
- opportunity taken to acquire images of a new nova in Cygnus

V2491 Cyg - nova

V2491 Cyg (Cygnus) 
Nova 'V2491 Cyg' was discovered in Cygnus by 
Koichi Nishiyama, Kurume, Fukuoka-ken, Japan, 
and Fujio Kabashima, Miyaki-cho, Saga-ken, Japan, 
on unfiltered CCD images taken 2008-04-10.728 UT 
at magnitude 7.7 (IAU Circular No. 8934)
(AAVSO Special Notice #103)

Image below (2008-04-14.98 UT) was taken 
4.25 days above discovery.
Estimated magnitude +8.9 (C)
Annotated CCD Image 
20s exposure, 2x2 binning, C Filter 
2008-04-14 23:30hUT (#281142)
CCD Image 
(Image details as above)

V2491 Cyg - detail
Nova is marked by white indicators 
CCD Image 
3x20s exposure (average combine), 2x2 binning, C Filter 
2008-04-14 23:48hUT (#281164-66)

DSS Reference Image
(same fov as above image)
 [ image from http://archive.stsci.edu/cgi-bin/dss_form ]

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Astrometric and Photometric Monitoring

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This Web Page: CCD Images - Session 281  (2008-04-14)
Last Updated : 2008-04-27
Site Owner : David Richards
Home Page : David's Astronomy Web Site