Central Bureau for Astronomical Telegrams

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IAUC 7898: 2002ct; 2002cu NEAR NGC 6575; C/1999 F3, C/1999 W2

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IAUC number

                                                  Circular No. 7898
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)

     M. Schwartz, Cottage Grove, OR; and W. Li, University of
California at Berkeley, report the LOTOSS (cf. IAUC 7514) discovery
of an apparent supernova (mag about 20.1) on unfiltered images
taken with the 0.81-m Tenagra II telescope on May 10.3 and 12.2 UT.
The new object is located at R.A. = 12h47m22s.53, Decl. =
+28o00'13".9 (equinox 2000.0), which is about 13" west and 8" south
of the nucleus of the apparent host galaxy.  A Tenagra II image
taken on Apr. 14.3 showed nothing at this position (limiting mag
about 22).

     Li reports the LOTOSS discovery of a possible supernova on
unfiltered CCD images taken with the 0.8-m Katzman Automatic
Imaging Telescope (KAIT) on May 11.5 (mag about 17.6) and 12.5 UT
(mag about 17.3).  Located at R.A. = 18h10m50s.40, Decl. =
+31o06'32".3 (equinox 2000.0), SN 2002cu is 91".3 west and 26".0
south of the nucleus of NGC 6575.  A KAIT image taken on May 5.5
showed nothing at this position (limiting mag about 18.5).
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum (range
370-750 nm) of SN 2002cu, obtained by M. Calkins on May 13.45 UT
with the F. L. Whipple Observatory 1.5-m telescope (+ FAST
spectrograph), shows it to be a type-Ia supernova near maximum.
The spectrum appears very similar to that of SN 1999ac at maximum.
The Si II (rest 635.5 nm) line is fairly broad (FWHM 11400 km/s)
and would indicate an exceptional expansion velocity of 17400 km/s
if the host galaxy is NGC 6575 (adopting the NASA/IPAC
Extragalactic Database recession velocity of 6992 km/s).

COMETS C/1999 F3 AND C/1999 W2 (SOHO)
     Further to IAUC 7897, D. Hammer reports his measurements for
additional comets found by R. Kracht on SOHO archival C2 images
(C/1999 F3 was also visible in C3 coronagraph images).  The reduced
astrometry and orbital elements by B. G. Marsden appear on the
MPECs cited below.  Comet C/1999 W2 is a member of the Kreutz
group; C/1999 F3 belongs to the Meyer group (cf. IAUC 7832).

  Comet         1999 UT          R.A. (2000) Decl.       MPEC
  C/1999 F3     Mar. 17.238      23 50.8   + 0 08       2002-H26
  C/1999 W2     Nov. 26.439      16 07.0   -22 34       2002-G45

                      (C) Copyright 2002 CBAT
2002 May 13                    (7898)            Daniel W. E. Green

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