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IAUC 4164: Sats OF URANUS; R Leo; NOVAE

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                                                  Circular No. 4164
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


SATELLITES OF URANUS
     B. A. Smith, on behalf of the Voyager Imaging Science Team,
reports the discovery of six more new satellites of Uranus.
Revolution periods  P  (in hr), orbital semimajor axes  a  (in km) and
estimated satellite radii  R  (in km) are as follows:

  Object      P       a      R     Object      P       a      R

  1986 U1   12.32   66 090   50    1986 U4   13.41   69 920   30
  1986 U2   11.83   64 350   40    1986 U5   14.93   75 100   30
  1986 U3   11.13   61 750   40    1986 U6   11.39   62 700   30

Discovery dates were Jan. 3 for 1986 U1 and U2, Jan. 9 for 1986 U3
and Jan. 13 for the remainder.  For 1985 U1 (IAUC 4159; discovered
1985 Dec. 30) P = 18.284 hr, and refinements yield a = 85 980 km.


R LEONIS
     A. M. le Squeren and P. Sivagnanam, Observatoire de Paris,
Meudon, telex: "Using the Nancay radio telescope, we have detected
an unusual intensity variation of the emission from the Mira-type
variable R Leo since 1981.  A strong feature at 1665 MHz, without
the OH 1667-MHz counterpart, was suddenly detected in 1985 Sept.
This feature is circularly polarized, and its velocity is not very
different (within ~ 1 km/s) from the stellar velocity measured
from the thermal molecular line.  Its intensity has decreased by
a factor of nearly ten in three months.  This is the first
instance of a sudden, strong OH variation during monitoring of 15
Mira-type stars.  Observations in the infrared and other maser
lines should be useful to explore the strange behavior of R Leo."


NOVAE
     Recent visual magnitude estimates:

     PW Vul = Nova Vul 1984 No. 1: 1985 Aug. 7.23 UT, 11.4 (R.
Ducoty, Capitola, CA); 30.83, 11.7 (E. Schweitzer, Strasbourg,
France); Sept. 6.89, 11.7 (Schweitzer); Oct. 4.82, 12.2 (Schweitzer);
10.88, 12.2 (Schweitzer); Nov. 9.85, 12.1 (G. M. Hurst,
Basingstoke, England); Dec. 29.74, 12.1 (Hurst).

     Nova Vul 1984 No. 2: Aug. 30.83, 10.4 (Schweitzer); Sept.
6.93, 10.2 (Schweitzer); Oct. 4.86, 10.4 (Schweitzer); 10.90, 10.4
(Schweitzer); Nov. 9.84, 10.7 (Hurst); Dec. 29.75, 10.4 (Hurst).


1986 January 16                (4164)              Brian G. Marsden

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