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IAUC 2909: 1976 AA

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                                                  Circular No. 2909
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


1976 AA
     The following precise positions have been reported:

     1976 UT             R. A. (1950) Decl.       Mag.   Observer
     Jan. 12.74413     6 21 45.22   +27 41 57.0   14     Seki
          12.75212     6 21 41.97   +27 43 03.2            "
          20.13021     5 25 25.87   +43 27 52.4          Giclas
          20.14896     5 25 15.95   +43 29 57.9            "
          21.17431     5 16 42.64   +45 18 08.4            "
          21.18611     5 16 36.34   +45 19 20.4            "
          21.90988     5 10 29.43   +46 31 22.5          Milet
          21.92027     5 10 24.02   +46 32 22.5            "
          23.18577     4 59 43.65   +48 30 32.2          Young
          24.64891     4 47 14.79   +50 33 40.8   14     Tomita
          24.65307     4 47 12.60   +50 34 03.1            "

T. Seki (Geisei).  From Orient. Astron. Assoc. Comet Bull. No. 119.
H. L. Giclas (Lowell Observatory).  Measurer: M. L. Kantz.
B. Milet (Nice Observatory).
J. Young (Table Mountain Observatory).  Measurer: S. J. Bus.
K. Tomita (Tokyo Astronomical Observatory, Okayama Station).

     D. Morrison, Lunar and Planetary Laboratory, reports that
preliminary photometric and polarimetric observations by J. C. Gradie
during Jan. 13-23 indicate V(1,0) = 17.6, B-V = +0.8, U-B = +0.5
and visual geometric albedo ~ 0.21 (confirmed by 10-um radiometry).
The resulting diameter is about 0.8 km.  The amplitude of the light
curve is probably less than 0.2 magnitude.  1976 AA appears to be
physically similar to previously studied earth-approaching asteroids.

     Extension of the ephemeris on IAUC 2905:

     1976 ET     R. A. (1950) Decl.     Delta     r     Mag.
     Feb. 12     2 36.96    +63 06.0    0.212   1.031   16.4
          17     2 12.12    +64 23.7
          22     1 50.43    +65 20.5    0.250   1.002   16.8
          27     1 30.96    +66 01.7
     Mar.  3     1 12.90    +66 29.5    0.283   0.971   17.2
           8     0 55.63    +66 43.3
          13     0 38.85    +66 40.6    0.308   0.939   17.4
          18     0 22.67    +66 18.0
          23     0 07.57    +65 32.0    0.325   0.907   17.6


1976 February 5                (2909)              Brian G. Marsden

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