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IAUC 7945: P/2002 O5; V4741 Sgr; 2002ef

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IAUC number 

                                                  Circular No. 7945
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)


COMET P/2002 O5 (NEAT)
     The following orbital elements from MPEC 2002-P06 are very
uncertain:

     T = 2002 Aug.  2.873 TT          Peri. =  15.130
     e = 0.64137                      Node  = 281.707   2000.0
     q = 1.18274 AU                   Incl. =  21.102
       a =  3.29795 AU     n = 0.164566     P =   5.99 years


V4741 SAGITTARII
     S. Mazuk, C. C. Venturini, R. J. Rudy, D. K. Lynch, The
Aerospace Corporation; R. C. Puetter, Center for Astrophysics
and Space Sciences, University of California at San Diego; and
R. B. Perry, NASA Langley Research Center, report 0.8-2.5 micron
spectroscopy of the nova V4741 Sgr using the Lick Observatory
3-meter telescope and Aerospace Corporation Near-Infrared Imaging
Spectrograph on July 19.29 UT (about 95 days after discovery):
"He I at 1.0830 micron is the strongest emission line in the
spectrum and the H I Paschen and Brackett series are prominent.
O I lines excited by Lyman-beta fluorescence are still present
although He II lines are starting to appear. The emission lines
are broad (FWHM ranging from 2600-3600 km/s) and have peculiar,
flat topped profiles.  No coronal lines are detected. The relative
strengths of the He I and H I lines suggest that helium abundance
is enhanced relative to the solar value."


SUPERNOVA 2002ef IN NGC 7761
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum
(range 370-750 nm) of SN 2002ef (cf. IAUC 7943), obtained by
M. Calkins on Aug. 1.43 UT with the F. L. Whipple Observatory
1.5-m telescope (+ FAST spectrograph), shows it to be a Type Ia
supernova near maximum.  Adopting the NASA/IPAC Extragalactic
Database recession velocity of 7080 km/s for the host galaxy, the
supernova expansion velocity is about 11 700 km/s for Si II (rest
635.5 nm).  The spectral-feature age of the supernova is 1 +- 2
days before maximum light.

                      (C) Copyright 2002 CBAT
2002 August 2                  (7945)          Carl W. Hergenrother

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