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IAUC 7670: 2001dg; 2001dh; WZ Sge

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                                                  Circular No. 7670
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVA 2001dg IN CGCG 513-10
     G. M. Hurst, Basingstoke, England, reports the discovery by M.
Armstrong (Rolvenden, Kent) of a supernova (mag about 17.5) on an
unfiltered CCD image taken on July 22.023 UT in the course of the
U.K. Nova/Supernova Patrol.  SN 2001dg is located at R.A. =
22h10m13s.28, Decl. = +36o39'14".2 (equinox 2000.0), as determined
from a follow-up image obtained on July 23.024, when the new object
appeared at similar brightness; this is 19" west and 3" south of
the center of CGCG 513-10.  No stellar object appears at this
location on Armstrong's image of the galaxy from 2000 Sept. 23
(limiting mag about 19.0).  R. Arbour (South Wonston, Hampshire)
confirmed the presence of the new object on an exposure taken on
July 22.908.
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
2001dg, obtained by P. Berlind on July 24.40 UT with the Mt.
Hopkins 1.5-m telescope (+ FAST spectrograph), shows it to be a
type-II supernova near maximum light.  The spectrum exhibits a blue
continuum with P-Cyg lines of hydrogen.  Adopting the NASA/IPAC
Extragalactic Database recession velocity of 6143 km/s for the host
galaxy, the expansion velocity derived from the minimum of the
H-beta line is about 8600 km/s.

SUPERNOVA 2001dh IN MCG -06-44-26
     R. Chassagne, Ste. Clotilde, Ile de Reunion, reports the
discovery of an apparent supernova (mag about 15.5) on unfiltered
CCD images taken on July 22.88 and 24.85 UT with a 0.3-m reflector.
The new object is located at R.A. = 20h17m24s.16, Decl. =
-38o40'37".4 (equinox 2000.0), which is 38".7 east and 11".2 south
of the nucleus of MCG -06-44-26 (= ESO 340-G9).  Images taken on
June 18.1 and 26.1 show nothing at this position (limiting mag
about 19.0), and SN 2001dh does not appear on a Digital Sky Survey
image taken with the U.K. Schmidt 1.2-m telescope on 1978 Sept.
24.4 (limiting mag about 21.0).

     "Quick-look" magnitudes (accurate to about 2 percent) obtained
by A. U. Landolt, Louisiana State University, with the Cerro Tololo
1.5-m telescope:  July 25.17728 UT, V = 8.26, B-V = -0.12, U-B =
-0.99; 25.18021, 8.21, -0.11, -0.97, V-R = -0.02, R-I = -0.02;
25.23370, 8.31, -0.10, -0.96, -0.02, -0.04.

                      (C) Copyright 2001 CBAT
2001 July 25                   (7670)            Daniel W. E. Green

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