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CCD Images - Session 290 (2008-06-08)

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Objects Session Notes
Bullet V2491 Cyg - nova
Bullet HAT-P-5 (GSC 2634:1087) - Parent Star to exosolar planet
Bullet EV Lac - variable star
Bullet Astrometric & Photometric Monitoring
- SS Cyg (dwarf nova)
- SS Her, U Her (mira variable)
- BL Lac (blazar)
- Z And, R CrB (variables)
- V2491 Cyg (nova)
- Barnard's Star, Ross 248, Groombridge 34, 61 Cyg (Nearby Stars)

 

- Late evening/night session (2.3hr) - operated & monitored under remote control
- CCD operation of -20 degC 
(at 78% average cooling). 
- main objective was to acquire images of certain selected stars for ongoing photometric and astrometric analysis
- opportunity taken to acquire images of the exosolar planet host star HAT-P-5 and the flare star variable EV Lac.

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, 
but have only now been analysed to produce a light curve.

V2491 Cyg - Light Curves 
showing decline from discovery (+7.7) to today's measurement (+14.0)
and further decline beyond.

Image

Image

Image

V2491 Cyg - Reference Stars (earlier image)

Image
Annotated CCD Image 
15s exposure, 2x2 binning, V Filter 
2008-04-14 23:51hUT (#281171)
CCD Images showing decline in V2491 Cyg since initial image
Nova is marked by white indicators

V2491 Cyg 
(2008-06-08.99 UT)

59.3 days after nova discovery.
Estimated magnitude +14.0 (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 1 20s exposure (average combine), 
2x2 binning, C Filter 
2008-06-08 23:56hUT (#290054-56)
3 x 20s exposure (average combine), 
2x2 binning, C Filter 
2008-04-14 23:48hUT (#281164-66)

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HAT-P-5 (GSC 2634:1087) - Parent Star to Exosolar Planet

Baseline images of HAT-P-5 parent star (GSC 2634:1087) were acquired as part of a a future project to attempt to detect the transit of an exosolar planet using my 8" LX200 scope. HAT-P-5 was only recently discovered (reference) . It rotates around its host star in ~ x,x days, and has a reported transit time of x.xx hours.

HAT-P-5 Parent Star / GSC GSC 2634:1087 (Lyra)
Image
Annotated CCD Image 
3 x 60 sec exposure (average combine), 2x2 binning, C Filter
2008-06-08 23:36h UT (#290040-44)
 
HAT-P-5  - Reference Stars 
Image
Annotated CCD Image 
2 x 60 sec exposure (average combine), 2x2 binning, R Filter
2008-06-08 23:42h UT (#290040-44)

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EV Lac - variable star

Baseline images of EV Lacerta were recorded.

EV Lac (Lacerta)
Image
Annotated CCD Image 
3 x 30 sec exposure (average combine), 2x2 binning, C Filter
2008-06-09 00:22 UT (#290078-82)
 
EV Lac - Reference Stars 
Image
Annotated CCD Image 
60 sec exposure, 2x2 binning, R Filter
2008-06-09 00:20 UT (#290079)

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Astrometric and Photometric Monitoring

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This Web Page: CCD Images - Session 290  (2008-06-08)
Last Updated : 2015-05-16
Site Owner : David Richards
Home Page : David's Astronomy Web Site