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IAUC 8511: 2005bi, 2005bj; (5905); V2361 Cyg; 2005be

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IAUC number 

                                                  Circular No. 8511
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)


SUPERNOVAE 2005bi AND 2005bj
     T. Boles, Coddenham, England, reports the discovery of two
apparent supernovae on unfiltered CCD images:  SN 2005bi (mag 18.5)
was observed on Apr. 11.015 and 12.004 UT at R.A. = 16h27m21s.27,
Decl. = +39o06'43".2 (equinox 2000.0), which is approximately 10".0
west and 8".0 north of the center of MCG +07-34-36; nothing was
visible at this location on his images taken on 2004 Aug. 6 and May
27 (limiting mag 19.5) or on Digitized Sky Survey plates from 1993
(limiting red mag 20.5) and 1989 (limiting blue mag 20.5).  SN
2005bj (mag 17.7) was observed on Apr. 11.096 and 12.014 at R.A. =
16h49m44s.74, Decl. = +17o51'48".7, which is approximately 12".0
east and 3".5 south of the center of MCG +03-43-5; nothing was
visible at this location on his images taken on 2004 July 5 and May
22 (limiting mag 19.5) or on DSSplates from 1992 (limiting red mag
21.0) and 1991 (limiting blue mag 20.5).


(5905) JOHNSON
     B. Warner, Colorado Springs, CO; P. Pravec and P. Kusnirak,
Ondrejov Observatory; D. Pray, Coventry, RI; A. Galad and S. Gajdos,
Modra Observatory; and P. Brown and Z. Krzeminski, Department of
Physics and Astronomy, University of Western Ontario, report that
photometric observations obtained during 2005 Apr. 1-11 show that
(5905) is a binary system with an orbital period of 21.78 hr.  The
primary rotates with a period of 3.783 hr, and its lightcurve
amplitude of 0.11 mag is indicative of a nearly spheroidal shape.
Mutual events 0.15-0.18 mag deep indicate a secondary-to-primary
mean-diameter ratio of 0.4.


V2361 CYGNI
     M. Bode, R. Zamanov, and J. Marchant, Liverpool John Moores
University; and T. J. O'Brien, Jodrell Bank Observatory, report the
following CCD magnitude estimates of this nova, obtained with the
2-m Liverpool telescope on La Palma:  Mar. 17.229 UT, V = 18.80, r'
= 17.25, i' = 16.64; 18.210, 18.80, 17.25, 16.65; 29.181, 18.55,
16.77, 16.51; 30.179, 18.30, 16.72, 16.40; Apr. 2.170, 18.38,
16.67, 16.53.  Uncertainties due to nearby star are about 0.10 mag
in Johnson V, and 0.05 mag in Sloan r' and i'.


SUPERNOVA 2005be
     T. Puckett writes that he has revised the unfiltered magnitudes
of SN 2005be reported on IAUC 8506 as follows:  Apr. 5.27 UT, 16.1;
6.21, 16.4.

                      (C) Copyright 2005 CBAT
2005 April 13                  (8511)            Daniel W. E. Green

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