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IAUC 2949: V616 Mon (A0620-00); NEPTUNE; NEPTUNE II (NEREID)

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IAUC number 

                                                  Circular No. 2949
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


V616 MONOCEROTIS (A0620-00)
     T. Matilsky, Massachusetts Institute of Technology, reports
that the SAS-3 Group has observed evidence for a 7d.8 +/- 0d.7
periodicity in the 1.3-5 keV flux of A0620-00.  The 150 data points are
spaced at approximately equal intervals over 32 days beginning Jan.
7, when the source brightness was 0.2 that of the Crab.  The
50-percent-amplitude modulation is approximately sinusoidal, with the
first minimum occurring on Jan. 14.


NEPTUNE
     R. R. Joyce, Kitt Peak National Observatory, reports that the
infrared brightness of Neptune has increased considerably during
the past year, especially in the L band.  He provides the observations:
1975 Feb. 25, J = 9.91, H = 9.79, K = 11.40, L > 11.2; June
2, 9.61, 9.47, 11.09, > 11.0; 1976 Mar. 16, 9.03, 8.81, 9.60, 9.69.


NEPTUNE II (NEREID)
     K. Aksnes, Center for Astrophysics, provides the following
continuation to the ephemeris on IAUC 2771:

     1976 ET     R. A. (1950) Decl.      dR.A.  dDecl.
     May   2    16 47.19    -20 47.8    - 76"3  + 56"0
          12    16 46.18    -20 45.8    - 94.0  + 56.7
          22    16 45.07    -20 43.8    -111.0  + 57.0
     June  1    16 43.92    -20 41.7    -127.1  + 56.9
          11    16 42.75    -20 39.7    -141.7  + 56.3
          21    16 41.63    -20 37.8    -154.6  + 55.0
     July  1    16 40.57    -20 36.1    -165.3  + 53.1
          11    16 39.64    -20 34.7    -173.2  + 50.4
          21    16 38.86    -20 33.7    -177.6  + 46.8
          31    16 38.26    -20 33.1    -177.6  + 42.0
     Aug. 10    16 37.86    -20 32.9    -171.5  + 35.9
          20    16 37.70    -20 33.2    -156.6  + 27.9
          30    16 37.77    -20 34.1    -126.7  + 17.4
     Sept. 9    16 38.12    -20 35.4    - 65.8  +  3.0
          19    16 38.74    -20 37.2    + 40.5  - 10.9
          29    16 39.54    -20 39.1    +110.6  - 12.3
     Oct.  9    16 40.50    -20 41.3    +140.8  -  8.6


1976 May 11                    (2949)              Brian G. Marsden

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