Central Bureau for Astronomical Telegrams

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IAUC 7596: 2001ac; 2001ad; C/1999 T1

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                                                  Circular No. 7596
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 2001ac IN NGC 3504
     S. Beckmann and W. D. Li, University of California at
Berkeley, on behalf of LOTOSS (cf. IAUC 7514), report the
discovery of an apparent supernova (mag about 18.2) on
unfiltered CCD images taken on Mar. 12.4 and 13.3 UT with the
0.8-m Katzman Automatic Imaging Telescope (KAIT).  SN 2001ac is
located at R.A. = 11h03m15s.37, Decl. = +27 58'29".5 (equinox
2000.0), which is 55".3 east and 9".1 north of the nucleus of
NGC 3504.  A KAIT image taken on Feb. 4.4 UT showed nothing at
this position (limiting mag about 19.0).


SUPERNOVA 2001ad IN NGC 6373
     Li also forwards the report by X. Y. Dong, Y. L. Qiu, and
J. Y. Hu, on behalf of the Beijing Astronomical Observatory
(BAO) Supernova Survey, of the discovery of an apparent supernova
(mag about 17.4) on an unfiltered CCD image taken with the BAO
0.6-m telescope on Mar. 11.8 UT.  SN 2001ad is located at R.A.
= 17h24m02s.45, Decl. = +58 59'52".2 (equinox 2000.0), which
is 43".2 west and 10".3 north of the nucleus of NGC 6373.
SN 2001ad was confirmed at mag 18.4 on an unfiltered KAIT image
taken on Mar. 13.5, from which Li measured the position end
figures to be 02s.40, 52".0, which is 44".3 west and 9".6 north
of the galaxy nucleus.  Images taken with the BAO 0.6-m
telescope on Mar. 8.8 (limiting mag about 17.5) and with KAIT
on 2000 Sept. 9 (limiting mag about 19.5) showed nothing at
this position.


COMET C/1999 T1 (McNAUGHT-HARTLEY)
     E. A. Bergin, Harvard-Smithsonian Center for Astrophysics
(CfA); D. A. Neufeld, Johns Hopkins University; and S. C.
Kleiner, Z. Wang, and G. J. Melnick, CfA, write:  "The
1(10)-1(01) transition of water vapor near 557 GHz was
detected toward comet C/1999 T1 by the Submillimeter Wave
Astronomy Satellite.  During the periods Feb. 2.01-11.06 and
23.01-28.95 UT, the average integrated antenna temperatures
were 0.58 +/- 0.02 and 0.39 +/- 0.03 K km s**-1, respectively,
within a 3'.3 x 4'.5 (FWHM) elliptical beam.  For a spherical
outflow model with an assumed water lifetime of 7.3 x 10**4 s
and an assumed water ortho-para ratio of 3, the inferred total
water production rates (x 10**28 molecules/s) are 5.7 and
4.4, respectively."

                      (C) Copyright 2001 CBAT
2001 March 13                  (7596)            Daniel W. E. Green

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