Central Bureau for Astronomical Telegrams
IAUC 8074: 2003at; 2003ai; V2275 Cyg; C/2002 V1
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Circular No. 8074
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 2003at IN MCG +11-20-23
Further to IAUC 7955, M. Armstrong reports his discovery of an
apparent supernova (mag 17.2) on unfiltered CCD images taken on
Feb. 15.150 and 17.062 UT. The new object is located at R.A. =
= 16h38m47s.81, Decl. = +66o01'23".7, which is approximately 3"
east and 13" north of the center of MCG +11-20-23. Nothing was
visible at this position on Armstrong's images taken on 2002 Apr.
23 and May 18 or on Palomar Sky Survey plates.
SUPERNOVA 2003ai
Further to IAUC 8071, T. Matheson et al. report that a
spectrum (range 370-750 nm) of SN 2003ai (IAUC 8068), obtained by
P. Berlind on Feb. 10.38 UT with the 1.5-m telescope, shows it to
be a type-Ia supernova before maximum. A weak, narrow H-alpha
emission line superposed on the spectrum of the supernova indicates
a recession velocity of 10600 km/s for the host galaxy. Using this
value, the supernova expansion velocity is about 10400 km/s for Si
II (rest 635.5 nm). The silicon line appears to be weaker in
comparison with typical type-Ia supernovae at a similar phase. The
spectral-feature age of the supernova is 7 +/- 2 days before
maximum light.
V2275 CYGNI
S. Balman and A. Yilmaz, Middle East Technical University; A.
Retter, University of Sydney; T. Ak, T. Saygac, and H. Esenoglu,
Istanbul University; and Z. Aslan, Turkish National Observatory,
Turkish National Research Council (TUBITAK), report that R-band CCD
photometry, obtained with the new Russian-Turkish 1.5-m telescope
at TUBITAK National Observatory, Antalya, during 2002 June 10, 12,
Oct. 1, 2, 3, 5, Dec. 1, and 22 reveals the presence of large
variations in the light curve of this classical nova (IAUC 7686),
with a period of either 0.463 +/- 0.014 day or the 1-day alias at
0.316 +/- 0.007 day. The semi-amplitude of the variations is about
0.5 mag. If the 0.463-day modulation is the correct period, the
system has wide eclipses. Further observations are encouraged.
COMET C/2002 V1 (NEAT)
Visual m_1 estimates (B = binoculars): Jan. 18.73 UT, 6.7
(B. H. Granslo, Fjellhamar, Norway, 7x50 B); 30.12, 5.6 (C. S.
Morris, Fillmore, CA, 10x50 binoculars); Feb. 11.76, 3.0 (J.
Shanklin, Ombersley, England, 10x50 B); 12.97, 2.3 (J. Bortle,
Stormville, NY, 15x70 B); 14.72, 1.5 (Granslo, 12x50 B); 16.29,
-0.5 (J. Gonzalez, Asturias, Spain, 11x80 B).
(C) Copyright 2003 CBAT
2003 February 16 (8074) Daniel W. E. Green
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