(cba:news) FW: AAVSO Special Notice #208: Optical transient in Pegasus]
jop at astro.columbia.edu
Sat May 8 15:59:33 EDT 2010
This is potentially a SENSATIONAL object, if it is a dwarf nova, not a
classical. Probably pretty damn interesting if it's some third class of
object, too. Anything that erupts violently to 8th magnitude
frantically deserves our attention... and in particular OUR attention.
You might have to do aperture photometry to include both stars in the
double. I'd consider that the safe approach, although if you're well
acquainted with your local capabilities re psf fitting, telescope drive,
etc., make your own judgment. Also check all available news sources for
the doubtless rapidly evolving information on this star.
Could this be a true challenger to WZ Sagittae's supremacy? GW Lib and
V455 And were mighty impressive, but fell somewhat short. The heart
starts to beat faster...
Great follow-on to CR Boo in the night-time sky. BTW I hope that
southerners will consider this target, too. +21 doesn't look good, but
the nights are long, so maybe?
Subject: AAVSO Special Notice #208: Optical transient in Pegasus
AAVSO Special Notice #208
Optical transient in Pegasus
May 8, 2010
CBET 2273 (D.W.E. Green, editor) reports the discovery of a bright
transient in Pegasus by Dae-Am Yi (Yeongwol-kun, Gangwon-do, Korea).
The object was discovered at magnitude 10.8 on 2010 May 6.77 (JD
2455323.27) on an image taken with a Canon 5D + 93-mm camera lens. The
object brightened to magnitude 8.4 as observed on 2010 May 7.76
(2455324.26) on an image taken with a 400-mm lens. The transient object
appears to be concident with GSC 2197:886 on discovery images, but this
identification is not yet proven. The GSC star has a NOMAD catalog V
magnitude of 13.84 and is a close double with a separation of about 3
arcseconds. Based upon an examination of the POSS-I and POSS-II plates
by Arne Henden, it is possible that the double is composed of two
unassociated stars, one with a high proper motion. Observations of this
field are strongly encouraged both to obtain astrometry of the source
and to follow the progress of this outburst. It was noted by H. Yamaoka
(Kyushu University) that there is a bright ROSAT X-ray source within
seven arcseconds of the GSC star, and so the object may be a cataclysmic
variable of some kind.
CBET 2273 gives the coordinates of the GSC star for the object, which are
RA: 21 38 06.571 , Dec: +26 19 57.33
Charts for this object may be plotted using AAVSO VSP:
Please promptly submit all observations to the AAVSO using the name
This AAVSO Special Notice was prepared by M. Templeton.
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