Re: Variable or Nova?
- From: Greg Crinklaw <theskyhoundyoureye@xxxxxxxxx>
- Date: Fri, 27 Jul 2007 22:57:31 -0600
Rob Johnson wrote:
I estimate the star to be about magnitude 12.3, at RA 19:59:41.9
Dec +22:33:50.4 (2000.0); very close to the same as the Hubble Guide
Star GSC2 N0312032-155635, a variable, aka V418 Vulpeculae, which
goes from 13.6 to 16.0, so unless I have misestimated the magnitude,
what I saw is 3.3x brighter.
It's rather easy to be off by 1.3 magnitudes unless you do your photometry carefully. Did you do accurate V-magnitude photometry? Not only that, by the magnitudes listed in the GCVS can be in error (for instance it might incorrectly identify the filter used) or this Mira variable may simply be brighter than usual.
Sorry--but I think you likely just caught this variable at maximum.
--
Greg Crinklaw
Astronomical Software Developer
Cloudcroft, New Mexico, USA (33N, 106W, 2700m)
SkyTools: http://www.skyhound.com/cs.html
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