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CCD Images - Session 291 (2008-06-20)

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Objects Session Notes
Bullet V2491 Cyg - nova
Bullet C/2008 J1 (Boattini) - Comet
Bullet WZ Sge - variable star
Bullet Astrometric & Photometric Monitoring
- SS Cyg (dwarf nova)
- SS Her, U Her (mira variable)
- BL Lac (blazar)
- Z And, R CrB, U Sge (variables)
- V2491 Cyg (nova)
- Barnard's Star, Ross 248, Groombridge 34, 61 Cyg (Nearby Stars)

 

- Late evening/night session (2.4hr) - operated under automated control (problem encountered with remote control /remote monitoring) 
- Shortest night of the year / surprisingly cold
- CCD operation of -20 degC 
(at 66% average cooling).  
- main objective was to acquire images of certain selected stars for ongoing photometric and astrometric analysis

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)

Images of the Nova have been taken since a point 4 days after discovery.

CCD Images showing decline in V2491 Cyg since initial image
Nova is marked by white indicators

V2491 Cyg 
(2008-06-20.99 UT)

71.3 days after nova discovery.
Estimated magnitude +14.4 (C)

V2491 Cyg 
Earlier Image (2008-04-14.98 UT)

 4.25 days after nova discovery.
Estimated magnitude +8.5 (C)
Image Image
3 x 120s exposure (average combine), 
2x2 binning, C Filter 
2008-06-20 23:47hUT (#291042-44)
3 x 20s exposure (average combine), 
2x2 binning, C Filter 
2008-04-14 23:48hUT (#281164-66)
Photometric data for the nova have been compiled into a Light Curve.

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C/2008 J1 (Boattini) - Comet

C/2008 J1 (Boattini) 
passing through starfield in Cepheus
Image
Annotated CCD Image
60s, 2x2 binning, C Filter
2008-06-21 00:02hUT (#291052)
C/2008 J1 (Boattini)  - motion over 5 minute period
Image
Image
Annotated CCD Images (250% size, cropped)
60s, 2x2 binning, C Filter
Top: 2008-06-21 00:02hUT (#291052)
Bot: 2008-06-21 00:07hUT (#291056)

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WZ Sge - Variable Star

WZ Sge (Sagitta)
WZ Sge has been described as the King of Cataclysmics. 
Although outbursts are rare they are understood to be spectacular 
when they do occur, with rapid nova-like brightening and interestingly 
superhumps, eclipses and a long decay profile
[ VSNet  WZ Sge Page ]

GCVS Catalog details :UGSU+E+ZZ (+7.0 to +15.53)
Outbursts in  1978, 2001
Star field surrounding WZ Sge (Sagitta)
Image
CCD Image 
3 x 30 sec exposure (average combine), 2x2 binning, C Filter
2008-06-21 01:13h UT (#291126-30)
 
WZ Sge - detail 
WZ Sge est.mag +15.0
Image
Annotated CCD Image (200% size, cropped)
Image details as above

[for comparison see outburst image of WZ Sge by G. Masi ]

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Astrometric and Photometric Monitoring

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This Web Page: CCD Images - Session 291  (2008-06-20)
Last Updated : 2015-05-16
Site Owner : David Richards
Home Page : David's Astronomy Web Site