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IAUC 7679: 2001dm; V1178 Sco; C/2001 A2

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                                                  Circular No. 7679
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)

     B. A. Beutler, M. Modjaz and W. D. Li, University of California at
Berkeley, report the discovery by LOTOSS (cf. IAUC 7514) of an apparent
supernova (mag about 15.4) in unfiltered images taken with the Katzman
Automatic Imaging Telescope on Aug. 7.5 and 8.5 UT.  The new
object is at R.A. = 1h55m40s.55, Decl. = -29d55'20".7 (equinox
2000.0), which is 6".9 west and 0".4 north of the nucleus of NGC 749.
A KAIT image of the field taken on 2000 Dec. 28.2 showed nothing
at this position (limiting mag about 18.0).

     S. Mazuk, C. Venturini, R. J. Rudy and D. K. Lynch, The Aerospace
Corporation; and R. C. Puetter, Center for Astrophysics and Space Science,
University of California at San Diego, report 0.8-2.5-micron spectrophotometry
using the Lick Observatory 3-m telescope and Aerospace Near Infrared
Imaging Spectrograph on July 11.16 UT, about 20 days past peak brightness:
"The spectrum was very low excitation and showed broad linewidths
of about 2500 km/s.  Many permitted recombination lines of C I and N I were
present, probably indicating an overabundance of these elements.  The
strongest lines in the spectrum were the Lyman beta-fluoresced O I lines at
0.8446 and 1.1287 micron.  He I 1.0831-micron, the line that frequently
dominates the mid- and late-time nova spectra, is only about one-third the
strength of H I Paschen gamma."

     M. Kidger, Instituto de Astrofisica de Canarias, reports: "Monitoring
of the inner coma by the Spanish Comet Observers Team reveals two small
photometric events that are possibly related to the ejection of small
fragments from the nucleus.  Representative CCD R magnitudes, using a 10"
aperture and the USNO A2.0 catalogue for reference stars: July 23.996 UT,
12.62 (R. Ferrando, Pla D'Arguines, 0.26-m Schmidt-Cassegrain); 24.889, 12.80
(P. Manteca, Begues, 0.26-m Schmidt-Cassegrain); 25.936, 12.4 (D. Rodriguez,
Madrid, 0.20-m Schmidt-Cassegrain); 29.853, 12.79 (Manteca); 30.933, 12.92
(Manteca); 31.881, 12.85 (Manteca); Aug. 2.896, 12.95 (Manteca); 3.844, 13.1
(Manteca); 7.84, 13.4 (R. Ligustri, Latisana, Italy, 0.2-m reflector); 7.852,
13.4 (Ferrando).  The lightcurve indicates events of amplitude 0.4 and 0.2 mag
initiating at approximately July 25.0 and 30.0 respectively.  For comparison,
the major event around July 12 (cf. IAUC 7659, 7676) had an amplitude of 1.5
mag (10" aperture).  This indicates that, if due to fragmentation, these later
events were probably caused by the separation of small, short-lived splinters
that may not have been directly observable."

                      (C) Copyright 2001 CBAT
2001 August 9                  (7679)              Brian G. Marsden

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