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IAUC 6161: C/1994 G1; gamma-RAY FLARE FROM CTA 26; D/1931 R1

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                                                  Circular No. 6161
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     TWX 710-320-6842 ASTROGRAM CAM

     J. V. Scotti, Lunar and Planetary Laboratory, reports that
observations with the 0.9-m Spacewatch telescope on Apr. 5 and 6 show
a secondary nucleus of comet C/1994 G1 = 1994f, 2 mag fainter than
the primary and separated by 6".9 in p.a. 70 deg.  No companion was
noted in the previous Spacewatch images, obtained on Jan. 3.  Z.
Sekanina, Jet Propulsion Laboratory, finds that the observations
are consistent with splitting on 1994 Sept. 4 (+/- 15), 105 days
after perihelion, the companion's deceleration being 21.8 (+/- 6.8)
x 10**-5 solar attraction.  Ephemeris:  1995 Apr. 23, separation
7".2 in p.a. 68 deg; May 13, 7".3 in 67 deg; June 2, 7".2 in 65 deg.
During the Spacewatch January observation the separation would have
been only 1".1.

     J. R. Mattox, University of Maryland and Universities Space
Research Association; S. Wagner, Landessternwarte Heidelberg; T. A.
McGlynn, Compton Observatory Science Support Center; M. Malkan,
University of California, Los Angeles; J. F. Schachter, Harvard-
Smithsonian Center for Astrophysics; and P. Sreekumar, Goddard
Space Flight Center, on behalf of the Compton Observatory EGRET
Team, communicate:  "We report the EGRET detection of quasar CTA 26
(PKS 0336-019).  This optically-violently-variable object has z =
0.852.  The flux at energy >100 MeV during Apr. 4-11 was at least
an order of magnitude higher than the upper limits obtained in
previous observations.  EGRET is not currently observing this
source, but will observe CTA 26 again during May 9-June 6.
Observations at other wavelengths are of interest.  Unfortunately,
the sun is now only 35 deg from CTA 26, and approaching.  Contact
mattox@astro.umd.edu for more information."

COMET D/1931 R1
     MPC 24933 contains observations and MPC 25030 elliptical
orbital elements of a mag 15 comet discovered by C. W. Tombaugh on
exposures with the 0.3-m photographic telescope at the Lowell
Observatory in Sept. 1931.  As with C/1931 AN [cf. MPC 24423 and
24544; previously announced by Lampland and Newman (1933, A.N. 249,
105) as a minor planet], information about D/1931 R1 became
available in the late 1980s as the result of precise measurements
by B. A. Skiff following D. H. Levy's examination of the Lowell
Observatory plate archive.

1995 April 13                  (6161)            Daniel W. E. Green

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