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IAUC 6228: 1995 S1; 6P

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                                                  Circular No. 6228
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

COMET 1995 S1
     Word has been received from Japan of the independent visual
discoveries by Yuji Nakamura, Masaaki Tanaka, and Shougo Utsunomiya
of a comet, with the following information available:

     1995 UT           R.A. (2000) Decl.        m1       Observer
     Sept.17.792       9 03.5      - 2 28       7.0      Nakamura
          17.802       9 03        - 2 30       7        Utsunomiya
          17.80635     9 03.4      - 2 27                Tanaka

Y. Nakamura (Suzuka, Mie).  20x120 binoculars.  Comet diffuse; coma
   diameter 2'.  Motion noted as 1'.5 northward in 50 min.
   Communicated by T. Nakamura, National Astronomical Observatory,
S. Utsunomiya (Minamioguni, Kumamoto).  25x150 binoculars.  Coma
   diameter 5'; central condensation present.  Possible slight
   eastward motion in 40 min.  Communicated by A. Nakamura, Kuma,
M. Tanaka (Iwaki, Fukushima).  Discovered on Sept. 17.795 with
   25x150 binoculars, visual m1 = 7.5, coma diameter 5', strong
   central condensation.  Above position was from a 2-min exposure
   with a 0.20-m f/1.5 Schmidt camera (+ TP2415 film) that shows an
   ion tail 25' long in p.a. 260 deg and a dust tail 5' long in
   p.a. 320 deg.  Communicated by T. Hirayama, National
   Astronomical Observatory, Tokyo.

     M. J. Mumma, Goddard Space Flight Center (GSFC), NASA; M. A.
DiSanti, Universities Space Research Association and GSFC; and X.
Xie, National Academy of Sciences, National Research Council, and
GSFC, report the detection of water vapor in 6P/d'Arrest using the
NASA Infrared Telescope Facility (+ CSHELL) with the comet at r =
1.42 AU and Delta = 0.47 AU:  "The 202-303 ortho rotational line
(5083.93 cmE-1, rest) of the 111-100 vibrational hot-band was
detected in emission on Sept. 5 and 6 UT at the correct doppler-
shifted frequency (5083.81 cmE-1) and with the expected intensity.
A fluorescence model based on solar pumping in the 000-111
vibrational band, and assuming a rotational temperature of 50 K,
leads to a water-production rate of 8 x 10E27 molecules/s on Sept.

1995 September 18              (6228)            Daniel W. E. Green

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