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IAUC 6942: JUPITER; C/1995 O1

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                                                 Circular No. 6942
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/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


JUPITER
     J. Lecacheux and P. Drossart, Meudon Observatory; F. Colas,
Bureau des Longitudes; G. Orton and B. Fisher, Jet Propulsion
Laboratory; A. Sanchez-Lavega, R. Hueso, and J. F. Rojas,
University of Pais Vasco; and I. Miyazaki write:  "Jupiter's 58-
year-old white ovals known as BC and DE are now a single white oval
located at planetographic latitude -34 deg.  Pic-du-Midi
observations in the red continuum on 1998 Jan. 17 show a distinct,
very close pair of ovals, but infrared observations made with the
NASA Infrared Telescope Facility on Mar. 27 (after Jupiter emerged
from solar conjunction) show only a single oval.  This aspect was
confirmed via red and methane-band (890-nm) filters obtained since
May 7 at Pic-du-Midi.  The new oval 'BE' drifts at a rate of -0.20
deg/day relative to the System III rotation rate of the interior,
and the oval's corresponding longitude can be represented (from
data May 7-June 6) by 10338.2 deg - 0.2025 deg (JD - 2400000).
Extrapolation of the new oval position back to the 1997 Dec.-1998
Jan. time frame places it at the location of BC, but further
observations are needed the better to constrain the dynamics of the
new oval.  The collision event took place in Feb. 1998, when
Jupiter was close to conjunction.  The visible and infrared images
show the new oval 'BE' larger by about 20 percent than either BC or
DE was.  White oval FA is unchanged, drifting at a rate of -0.158
deg/day and separated westward from 'BE' by 24 deg on June 12."


COMET C/1995 O1 (HALE-BOPP)
     Ephemeris extension to IAUC 6799 (orbital elements MPC 31204):

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
June 16     6 06.41   -49 57.7   5.780   5.578   73.6   10.1    9.3
     26     6 16.41   -50 25.7   5.870   5.671   73.8    9.9    9.4
July  6     6 26.33   -51 05.6   5.957   5.764   74.2    9.8    9.5
     16     6 36.05   -51 56.6   6.041   5.856   74.7    9.6    9.6
     26     6 45.46   -52 58.3   6.122   5.947   75.4    9.5    9.7
Aug.  5     6 54.43   -54 09.8   6.200   6.038   76.1    9.4    9.8
     15     7 02.82   -55 30.3   6.277   6.128   76.9    9.3    9.9
     25     7 10.47   -56 58.7   6.354   6.217   77.7    9.1   10.0
Sept. 4     7 17.18   -58 33.9   6.429   6.306   78.5    9.0   10.0
     14     7 22.75   -60 14.4   6.505   6.394   79.3    8.9   10.1
     24     7 26.91   -61 58.9   6.580   6.482   80.0    8.8   10.2

                      (C) Copyright 1998 CBAT
1998 June 17                   (6942)            Daniel W. E. Green

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