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IAUC 7203: C/1999 H1; V382 Vel

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                                                  Circular No. 7203
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)
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Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1999 H1 (LEE)
     N. Biver, University of Hawaii; D. Bockelee-Morvan, P. Colom,
J. Crovisier, E. Gerard, and F. Henry, Observatoire de Paris-
Meudon; J. K. Davies and H. E. Matthews, Joint Astronomy Centre; D.
C. Lis and T. G. Phillips, California Institute of Technology
(Caltech); A. Sievers and D. Teyssier, Institut de Radioastronomie
Millimetrique (IRAM), Granada; L. Haikala, L. Nyman, and F.
Rantakyro, Swedish-ESO Submillimetre Telescope (SEST), La Silla;
and H. Weaver, Johns Hopkins University, report:  "The HNC J(3-2)
line at 272 GHz has been detected on June 6-7 at the James Clerk
Maxwell Telescope (JCMT) with a line area of 0.07 +/- 0.01 K km/s
in brightness temperature.  The HCN J(3-2) line observed on the
same dates yields a HNC/HCN mixing ratio of 0.12, a value close to
that found in comet C/1995 O1 at perihelion and twice higher than
that inferred in C/1996 B2, which provides further constraints on
the origin of HNC in comets.  From coordinated observations
undertaken at the SEST, Caltech Submillimeter Observatory, JCMT,
IRAM 30-m, and Nancay radio telescopes from May 4 to June 13,
several other species were observed, and their average abundances
relative to water were derived as follows:  HCN, 0.11 percent;
CH_3OH, 4 percent; H_2CO, 1.3 percent; CS, 0.09 percent; CO, < 6
percent.  The OH 18-cm transitions observed almost daily with the
Nancay radio telescope provide water-production rates of 5.5 x
10**28 s**-1 during May 19-23 and 1.2 x 10**29 s**-1 during June
4-13."


V382 VELORUM
     T. Napoleao, Sao Paulo, Brazil, reports that M. R. Mendes
(Dois Corregos, Brazil) obtained two prediscovery photographs of
V382 Vel = N Vel 1999 (cf. IAUC 7184) with a 50-mm f/1.8 camera
lens on Fuji Super G Plus (ISO 800) film as part of his monitoring
of eta Car.  The nova was at the following estimated magnitudes on
Mendes' photographs:  May 20.923 UT, about 7.0-7.5 (20-s exposure);
21.944, about 3.5 (30-s exposure).
     Further selected visual magnitude estimates, some communicated
via Napoleao:  June 8.022 UT, 5.9 (A. S. Barros, Maceio, Brazil);
8.946, 6.3 (J. G. de S. Aguiar, Campinas, Brazil); 9.895, 6.3 (W.
C. de Souza, Sao Paulo, Brazil); 10.456, 6.2 (A. Pearce, Nedlands,
W. Australia); 11.15, 6.4 (V. Buso, Rosario, Argentina); 12.042,
6.7 (Napoleao); 13.436, 6.6 (Pearce); 14.948, 6.8 (J. Garcia, Rama
Caida, Argentina); 15.448, 6.8 (Pearce); 15.917, 6.8 (Mendes).

                      (C) Copyright 1999 CBAT
1999 June 16                   (7203)            Daniel W. E. Green

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