-------------------------------------------------------------------
THE ASTRONOMER Electronic Circular No 2395      2007 Nov 20 16.21UT
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
-------------------------------------------------------------------
NEW DWARF NOVA IN CANCER: OT_J080714.2+113812
Itagaki-san, Japan has detected a possible new variable in Cancer 
located at:
RA 08h07m14.25s DEC +11 38'12.7" (2000), which was mag 13.6 (unfiltered 
CCD) on 2007 Nov. 13.71 UT.
His survey image taken on Oct. 2.796 UT does not show any object 
brighter than mag about 17.  K. Kadota, Ageo, Saitama, Japan, confirmed 
the existence of the object (unfiltered mag 13.7 on Nov. 15.67 UT). 
Itagaki supplies additional photometry; Nov. 16.688 UT, 13.8; 19.619, 
14.1.

Following a request from the VSNET team, H. Naito, Nishi-Harima 
Astronomical Observatory, took a low-resolution (410 - 670 nm, R = 330 
at H_alpha) spectrum of this object on Nov. 16.77 UT with the 2.0-m 
NAYUTA telescope.  It shows a smooth blue continuum with Balmer lines in 
absorption. A core of the H_alpha absoption is filled by the emission 
component.  It suggests that it is a dwarf nova in outburst.

Patrick Schmeer, Germany comments that the new dwarf nova is probably 
identical with the following catalogue entries:

SDSS J080714.25+113812.5 08:07:14.26 +11:38:12.5 g=20.941 r=20.954
USNO-B1.0 1016-0154084 08:07:14.23 +11:38:11.6 B2=20.08 R2=20.08
GSC2.3 N89Z011023 08:07:14.32 +11:38:11.3 F=19.76 Bj=20.74

The photometry in quiescence indicates a blue object (the NW
component of a faint double star on DSS images). The outburst amplitude 
(7 magnitudes) and duration suggest a WZ Sge-type dwarf nova at 
supermaximum.

Tom Krajci, Cloudcroft, New Mexico reports that three hours of 
unfiltered CCD time-series data show that this star is super-humping at 
approx mag 15, amplitude of 0.1 mag, and a rough period (by casual 
visual inspection of the data) of 0.062 days.

SUPERNOVAE 2007nm, 2007nn, 2007no, AND 2007np
S. G. Djorgovski, etl. report on CBET 1105 the discovery of four 
apparent type-Ia supernovae from the real-time analysis of transients 
discovered in the PQ sky survey all magnitude 19.5 or fainter.

SUPERNOVA 2007nq IN UGC 595
Discovery by R. Quimby et. al., of a possible supernova (CBET 1106):
SN      2007 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2007nq  Oct 21.15   00 57 33.57  -01 23 19.0  17.6  20.2"W, 8.9"N
A spectrum obtained on Oct. 23.19 with the 9.2-m Hobby-Eberly Telescope 
shows it to be a type-Ia supernova.

SUPERNOVAE 2007nr-2007oa
Further Sloan Digital Sky Survey II supernova discoveries all fainter 
than magnitude 20 according to CBET 1109.

SUPERNOVA 2007ob
Discovery by ROTSE of a possible supernova (CBET 1112):
SN      2007 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2007ob  Oct 28.13   23 12 25.99  +13 54 49.3  17:    0.1"E, 0.7"S

Guy M Hurst