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IAUC 4824: Sats OF NEPTUNE; 1989M; PU Vul; V482 Cyg

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                                                  Circular No. 4824
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


SATELLITES OF NEPTUNE
     The Voyager Imaging Team reports that three new satellites of
Neptune, 1989 N 2, 1989 N 3 and 1989 N 4, have been discovered in
Voyager 2 narrow-angle imaging data.  Each has been observed in at
least ten frames over a time span of five days, during which the
measurement error was about 400 km per narrow-angle pixel.  The
root-mean-square post-fit residuals are a few pixels.  The orbits are
all prograde and appear to be nearly circular and equatorial, although
there are suggestions of either nonzero eccentricity or inclination for
1989 N 3 and 1989 N 4.  The periods of the satellites are 0.56, 0.34
and 0.43 day, respectively.  They move at mean radial distances of
about 73 000, 52 000 and 62 000 km from the planet's center.  Very
preliminary calculations indicate that 1989 N 2 is about 1.5 mag
fainter than 1989 N 1 in the Voyager 2 narrow-angle clear filter, and
that 1989 N 3 and 1989 N 4 are 2.5-3.0 mag fainter than 1989 N 1.


SUPERNOVA 1989M IN NGC 4579
     Visual magnitude estimates: July 11.12 UT, 12.5 (J. Bryan,
Georgetown, TX); 14.49, 12.5 (T. Kato, Kyoto, Japan); 15.14, 12.3 (R.
D. Bunge, Columbus, OH); 29.85, [12.9 (A. Boattini, Florence,
Italy).


PU VULPECULAE
     Visual magnitude estimates: June 4.93 UT, 9.9 (A. Boattini,
Florence, Italy); 12.04, 10.5 (A. Pereira, Cabo da Roca, Portugal);
18.07, 10.2 (P. Schmeer, Bischmisheim, West Germany); 26.1, 10.3 (J.
Bortle, Stormville, NY); July 5.07, 10.5 (Pereira); 13.92, 10.2
(Schmeer); 27.10, 10.4 (Pereira).


V482 CYGNI
     Visual magnitude estimates: June 4.92 UT, 12.2 (A. Boattini,
Florence, Italy); 9.93, 13.0 (A. Pereira, Cabo da Roca, Portugal);
14.07, 12.0 (M. Verdenet, Bourbon-Lancy, France); 24.90, 12.5
(Boattini); 29.1, 12.4 (J. Bortle, Stormville, NY); July 9.1, 12.4
(Bortle); 16.00, 12.6 (P. Schmeer, Bischmisheim, West Germany); 29.94,
12.7 (Boattini).


1989 August 2                  (4824)              Brian G. Marsden

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