David's Astronomy - Images 2008-06-08 (S00290)

Objects Session Notes

V2491 Cyg - nova

HAT-P-5 (GSC 2634:1087) - Parent Star to exosolar planet

EV Lac - variable star

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.




V2491 Cyg - Reference Stars (earlier 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)

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)

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)