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IAUC 6615: C/1995 O1; 1997bo; 46P

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                                                 Circular No. 6615
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/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)

     R. Meier, University of Hawaii; H. Matthews, Joint Astronomy
Centre (JAC), Hilo, and National Research Council of Canada; T.
Owen and D. Jewitt, University of Hawaii; D. Gautier, N. Biver, D.
Bockelee-Morvan, and J. Crovisier, Observatoire de Paris, Meudon,
report the first detection of HDO in comet C/1995 O1 (see IAUC 6604)
with the James Clerk Maxwell Telescope at Mauna Kea on Apr. 4.8 UT:
"The integrated line intensity of the 101-000 HDO line at 464.925
GHz was (0.64 +/- 0.11) K km/s on the antenna temperature scale.
We also detected two weak lines of methanol at 464.835 GHz (92-91
transition, TA = 1.21 +/- 0.11 K km/s) and 457.000 MHz (112-111
transition, TA = 2.37 +/- 0.11 K km/s).  Assuming a rotational
temperature of 80 K, we derive a preliminary HDO production rate of
4 x 10E26 molecules/s.  This makes the HDO/H2O ratio about 2 x
10E-4, assuming a water-production rate Q(H2O) = 2 x 10E30
molecules/s (IAUC 6589).  The corresponding D/H about 10E-4 is
consistent with other values for hydrogen in condensed matter in
the outer solar system and in seawater on earth, and is well above
the values reported for H2 in the interstellar medium or in outer-
planet atmospheres."

     W.-d. Li, Beijing Astronomical Observatory (BAO), reports that
the field of SN 1997bo (cf. IAUC 6612) was observed numerous times
in the past two months by the BAO Supernova Survey with the BAO
0.6-m reflector (+ unfiltered CCD), yielding the following
estimated magnitudes:  Feb. 10, [17.5; 15, [18.0; Mar. 1, 15.7 +/-
0.2; 5, 15.8 +/- 0.2; 15,15.9 +/- 0.2; 27, 16.0 +/- 0.2; Apr. 3,
16.1 +/- 0.2; 4, 16.1 +/- 0.2.  The host galaxy is faint and
irregular, making it difficult to determine the position of its
nucleus; there is a relatively bright H II region east of its
nucleus, close to SN 1997bo.  A precise measurement of the
supernova from an Apr. 4 CCD frame yields R.A. = 12h19m52s.66,
Decl. = +7o43'49".7 (equinox 2000.0), which is 2".4 east and 0".7
north of the galaxy's center.

     Visual m1 magnitude estimates:  Mar. 6.80 UT, 9.6 (R. J. Bouma,
Groningen, The Netherlands, 0.25-m reflector); 31.84, 10.0 (Bouma);
Apr. 2.79, 10.0 (K. Sarneczky, Raktanya, Hungary, 0.44-m reflector);
6.84, 9.6 (A. Kammerer, Ettlingen, Germany, 0.20-m reflector).

                      (C) Copyright 1997 CBAT
1997 April 7                   (6615)            Daniel W. E. Green

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