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IAUC 7620: 2001bf; 2001bb; V445 Pup; C/2001 A2

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                                                  Circular No. 7620
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVA 2001bf IN MCG +04-42-22
     G. M. Hurst, Basingstoke, England, reports the discovery of an
apparent supernova (mag 16.5) by M. Armstrong, Rolvenden, on an
unfiltered CCD frame (limiting mag 18) taken on May 3.020 UT with a
0.30-m Schmidt-Cassegrain reflector in the course of the U.K.
Nova/Supernova Patrol.  Armstrong measured the new object's
position to be R.A. = 18h01m33s.99, Decl. = +26o15'02".3 (equinox
2000.0), which is 5" east and 8" south of the center of MCG
+04-42-22.  An image taken by Armstrong on May 4.965 shows that SN
2001bf had brightened to mag 15.9.  An image taken on May 5.001 by
T. Boles, Coddenham, also confirms the presence of the new object.
A master patrol image taken by Armstrong on 2000 June 8 showed
nothing at this position (limiting mag 18.5), and nothing appears
on Palomar Sky Survey images from 1991 May 14 (limiting red mag
20.8) and 1991 July 12 (limiting blue mag 22.5).


SUPERNOVA 2001bb IN IC 4319
     Regarding his discovery (cf. IAUC 7614), R. Chassagne adds
that a prediscovery CCD image shows SN 2001bb at mag 16.5-17.0 on
Apr. 27.8.


V445 PUPPIS
     A. C. Gilmore and P. M. Kilmartin report photometry obtained
with the 0.6-m f/16 Cassegrain telescope at the Mt. John
Observatory, indicating that this novalike variable is fading after
varying around mag 10 for the past two months:  Apr. 12.41 UT, V =
9.80, U-B = -0.40, B-V = +0.56, V-R = +0.46, V-I = +1.03; 13.36,
9.97, -0.39, +0.56, +0.47, +1.05; 14.37, 10.13, -0.39, +0.55,
+0.50, +1.07; 16.38, 10.21, -0.39, +0.54, +0.50, +1.04; 18.50,
10.33, -0.40, +0.53, +0.53, +1.09; 21.41, 10.64, -0.33, +0.56,
+0.54, +1.13; 22.40, 10.61, -0.26, +0.59, +0.56, +1.17; 23.45,
10.74, -0.26, +0.62, +0.60, +1.22; 24.35, 10.86, -0.32, +0.60,
+0.62, +1.27; 26.33, 11.04, -0.14, +0.62, +0.63, +1.29.  The
uncertainties are generally < 0.02 mag (but Apr. 24 observations
affected by cloud).


COMET C/2001 A2 (LINEAR)
     Visual m_1 estimates:  May 1.46 UT, 5.9 (M. Mattiazzo,
Wallaroo, S. Australia, 7x50 binoculars); 3.49, 6.2 (A. Pearce,
Nedlands, W. Australia, 20x80 binoculars); 4.38, 5.6 (D. A. J.
Seargent, The Entrance, N.S.W., 10x50 binoculars); 5.25, 5.8 (M.
Linnolt, Honolulu, HI, 10x50 binoculars).

                      (C) Copyright 2001 CBAT
2001 May 5                     (7620)            Daniel W. E. Green

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