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IAUC 3490: AM Her; 1980 LB

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IAUC number 

                                                  Circular No. 3490
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 617-864-5758


AM HERCULIS
     J. Mattei, American Association of Variable Star Observers,
provides the following visual magnitude estimates by AAVSO members:
Mar. 13.5 UT, 13.1 (J. Morgan, Prescott, AZ); 29.2, 13.3 (B. Bois,
Septilles, PQ); Apr. 24.5, 13.5 (Morgan); May 15.2, 13.6 (E. Mayer,
Barberton, OH); 16.3, 14.5 (J. Griese, Stamford, CT); June 4.2, 14.6
(Morgan); 6.2, 14.7 (Griese); 9.2, 15.2 (C. Scovil, Stamford, CT);
10.3,  15.2 (Morgan); 11.2, 15.3 (Scovil).


1980 LB
     E. Bowell, Lowell Observatory, provides the following precise
positions of an unusual minor planet that he has discovered:

     1980 UT             R. A. (1950) Decl.        Mag.
     June 11.37535    20 33 24.66   -20 14 16.0
          11.41771    20 33 24.18   -20 14 56.2
          14.37882    20 32 50.04   -21 00 01.8
          14.42188    20 32 49.33   -21 00 44.2    16.0
          17.32500    20 32 01.49   -21 47 24.7    16.0
          17.36111    20 32 00.67   -21 47 58.4
          18.31944    20 31 41.71   -22 03 56.9
          18.35556    20 31 40.84   -22 04 33.6    16.0

     Bowell also provides the following orbital elements, which
suggest that the object is a 2:1 librator with Jupiter.  The ephemeris
is from a similar computation by the undersigned, who confirms the
libration and finds a minimum Jupiter distance of ~ 2.5 AU.

       T = 1981 Feb. 20.94 ET
   Peri. = 260.52                     e =   0.3413
   Node  = 108.89  1950.0             a =   3.2352 AU
   Incl. =  42.08                     n =   0.16938
       q =   2.1310 AU                P =   5.82 years

     1980 ET     R. A. (1950) Decl.     Delta     r     Mag.
     June 10    20 33.59    -19 54.1    1.891   2.689   16.0
          20    20 31.07    -22 32.4
          30    20 25.70    -25 37.0    1.666   2.621   15.5
     July 10    20 17.51    -29 00.7
          20    20 06.93    -32 30.8    1.552   2.555   15.2


1980 June 26                   (3490)              Brian G. Marsden

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