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IAUC 6681: C/1995 O1; C/1997 L1

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                                                 Circular No. 6681
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1995 O1 (HALE-BOPP)
     D. Reuter and D. Jennings, Goddard Space Flight Center, NASA;
P. Sada, Monterrey Astronomical Consulting; K. Hinkle, S. Ridgway,
and L. Wallace, Kitt Peak National Observatory; and P. Bernath and
J. Waller, University of Waterloo, report the measurement of
infrared molecular-line fluorescence in comet C/1995 O1:
"Observations were made on Feb. 26.7, Mar. 27.6-27.9, and Mar.
28.6-28.9 UT using the Kitt Peak 2.1-m telescope (+ Phoenix
cryogenic grating spectrometer; spectral resolving power about
50 000).  Lines ranging from P(7) to P(15) were observed in the
nu_1 band of OCS near 4.861 microns.  We also observed six Q
branches of the nu_7 band of C_2H_6 near 3.344 microns.
Preliminary analysis of the line intensities indicates a rotational
temperature of < 120 K for both species.  An emission feature at
about 3.354 microns was assigned to the R_1e(11.5) and R_2f(10.5)
lines of the 0-1 band of CH."


COMET C/1997 L1 (XINGLONG)
     Parabolic orbital elements by B. G. Marsden from MPEC 1997-L03:

     T = 1996 Nov. 17.181 TT          Peri. = 345.518
                                      Node  = 233.290   2000.0
     q = 4.87585 AU                   Incl. =  72.900

1997 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
June  1    15 33.46   - 6 56.1   4.149   5.107  158.7    4.1   16.7
      6    15 30.63   - 6 08.3   4.190   5.119  153.5    5.1   16.7
     11    15 28.01   - 5 23.2   4.239   5.130  148.3    6.0   16.7
     16    15 25.61   - 4 40.9   4.294   5.143  143.0    6.8   16.8
     21    15 23.47   - 4 01.6   4.356   5.155  137.8    7.6   16.8
     26    15 21.61   - 3 25.3   4.424   5.167  132.7    8.3   16.9
July  1    15 20.04   - 2 52.1   4.498   5.180  127.6    9.0   16.9
      6    15 18.78   - 2 21.9   4.575   5.193  122.5    9.5   17.0
     11    15 17.83   - 1 54.7   4.657   5.207  117.6   10.0   17.0
     16    15 17.19   - 1 30.2   4.743   5.220  112.7   10.3   17.1
     21    15 16.86   - 1 08.5   4.831   5.234  108.0   10.6   17.1
     26    15 16.83   - 0 49.2   4.921   5.248  103.3   10.9   17.2
     31    15 17.10   - 0 32.2   5.012   5.262   98.7   11.0   17.2

                      (C) Copyright 1997 CBAT
1997 June 13                   (6681)            Daniel W. E. Green

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