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THE ASTRONOMER Electronic Circular No 2642      2010 May.01 16.39UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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POSSIBLE CATACLYSMIC VARIABLE: SDSS J182142.83+212153.5
Hitoshi Yamaoka, Japan reports that Itagaki-san noticed a possible new 
variable (mag 14.9) during his survey.  A confirmation image taken on 
Apr. 24.706 UT with his 0.60-m reflector yields the position of a new 
object as:
RA 18h 21m 42s.83 DEC +21 21' 53.8"(2000).  It seems to be an outburst 
of a star SDSS J182142.83+212153.5 (u=20.195, g=20.260, r=20.198, 
i=19.895, z=19.438), which is also catalogued in the USNO-B1.0 and the 
GSC 2.3. The amplitude suggests that it may be a new dwarf nova 
outburst. Time-resolved photometry and/or spectroscopic classification 
is urged.

In a further message on VSNET [vsnet-alert 11956] the Osaka Kyoiku U. 
team (Ryo Noguchi, Shinichi Nakagawa, Katsura Matsumoto) report that 
they succeeded in observing this object. Two superhumps with amplitude 
of ~0.3 mag were recorded, confirming the SU UMa-type nature of this 
object.  The period is around 0.08 d. Further observations are 
encouraged!

NOVA SCORPII NO 2
Further to the announcement on TA E-Circular 2641, K. Kinugasa, H. 
Takahashi, and O.Hashimoto, Gunma Astronomical Observatory report on 
this object which they confirm is a He/N nova. They add that
a low-dispersion spectrum (range 420-850 nm, resolution about 500) of 
this object on Apr. 29.745 with the GAO 1.5-m telescope (+GLOWS), shows 
broad (FWHM about 4000 km/s) Balmer and O I (777.4, 822.7 and 844.6 nm) 
emission lines. Both H-alpha and H-beta have asymmetric line profiles 
with a blue peak. Several emission lines of He I and N II are also seen. 
It indicates that this object is a He/N nova at a decline phase. This 
spectrum is at website URL:
http://www.astron.pref.gunma.jp/~kinugasa/nsco2010-2_100429.png .
(VSNET-Alert 11961)

SUPERNOVA 2010ay IN ANONYMOUS GALAXY
Discovery by Catalina Sky Survey of a possible supernova (CBET 2224):
SN      2010 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2010ay  Mar 17.38   12 35 27.19  +27 04 02.8  17.5     -       -
A. V. Filippenko et. al., University of California, Berkeley, report 
that inspection of CCD spectra of Mar. 22UT with the 3-m Shane reflector 
shows it is a type-Ic supernova similar to SN 1998bw. Given that such 
supernovae are sometimes associated with long-duration gamma-ray bursts 
a search for a possibly corresponding GRB should be conducted.

SUPERNOVA 2010az IN ANONYMOUS GALAXY
Discovery by Catalina Sky Survey of a possible supernova (CBET 2225):
SN      2010 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2010az  Feb 16.48   12 56 59.62  -17 37 35.5  17.7    3.9"W  12.6"N

SUPERNOVA 2010ba IN ANONYMOUS GALAXY
Discovery by Catalina Sky Survey of a possible supernova (CBET 2225):
SN      2010 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2010ba  Mar 21.33   11 58 20.68  +15 20 10.8  15.2    1.1"W,  1.3"S

Guy Hurst