Central Bureau for Astronomical Telegrams
IAUC 7957: 2001kf, 2001kg, 2001kh; 57P
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Circular No. 7957
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 2001kf, 2001kg, 2001kh
R. Ellis, California Institute of Technology; R. Pain, J.
Raux, G. Sainton, and K. Schahmaneche, Laboratoire de Physique
Nucleaire et de Hautes Energies, Universities of Paris 6 and 7; and
M. Sullivan, University of Durham, report the discovery of three
supernovae found on images from 2001 Oct. 10 with the CFH12k camera
at the Canada-France-Hawaii Telescope (CFHT) and confirmed four
nights later with the CFHT. Spectral identification was obtained
with a Keck telescope (+ ESI) on Oct. 20 and 23, with additional
spectroscopy and imaging obtained at CFHT on Nov. 12 and 16 and at
Keck on Nov. 16.
SN 2001 UT R.A. (2000) Decl. R z Type
2001kf Oct. 10 22 21 34.20 + 0 16 02.2 23.1 0.057 II-P
2001kg Oct. 10 22 20 52.51 + 0 43 05.8 22.7 0.280 Ia
2001kh Oct. 10 2 25 15.56 - 5 23 20.0 21.0 0.220 Ia
COMET 57P/DU TOIT-NEUJMIN-DELPORTE
Further to his report on IAUC 7946, Z. Sekanina writes: "Using
the code developed by P. W. Chodas and myself, I was able to link
the observations of the Aug. 7 secondary nucleus (MPEC 2002-P75)
with those of companion F on July 17 (MPEC 2002-P30). An excellent
fit (mean residual 0".26) suggests that F separated from nucleus A
most probably in the second half of May 2001, a little more than
400 days before perihelion at a heliocentric distance of about 3.6
AU. By contrast, all attempts to fit the offsets on the assumption
of a separation near the 1996 perihelion have failed, leaving
systematic residuals of a few arcsec. The 2001 solution is rather
insensitive to the adopted nongravitational deceleration, if it is
on the order of several units of 10**-4 solar attraction. The
derived separation velocity is then about 5 m/s, mostly in the
orbital plane. The predicted separation distances and position
angles (0h TT): 2002 Aug. 14, 401", 259.0 deg; 24, 398", 259.0 deg;
Sept. 3, 393", 259.0 deg; 13, 387", 258.8 deg; 23, 383", 258.4 deg;
Oct. 3, 381", 257.8 deg. Confirmation observations are needed to
understand the fragmentation sequence, because major deviations
from this ephemeris would indicate a different splitting scenario."
Total visual magnitude estimates: July 28.87 UT, 12.9 (M.
Reszelski, Szamotuly, Poland, 0.41-m reflector); Aug. 8.88, 13.9
(W. Hasubick, Buchloe, Germany, 0.44-m reflector); 12.94, 13.3
(R. J. Bouma, Groningen, The Netherlands, 0.31-m reflector).
(C) Copyright 2002 CBAT
2002 August 19 (7957) Daniel W. E. Green
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