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IAUC 5350: 1991 RC; AM Her

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IAUC number 

                                                  Circular No. 5350
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


1991 RC
     Further precise positions have been reported as follows:

     1991 UT             R.A. (1950) Decl.         V    Observer
     Sept.13.54492   21 57 13.22   -11 12 27.5   18.5   Hartley
          17.19326   21 49 19.90   -12 28 05.2          Scotti
          17.20201   21 49 18.81   -12 28 15.2            "
          17.21062   21 49 17.70   -12 28 25.0            "

M. Hartley (Siding Spring).  1.2-m U.K. Schmidt.  Beginning of
   faint trail.  Measurer R. H. McNaught.
J. V. Scotti (Kitt Peak).  0.91-m Spacewatch telescope.

     Improved elements, from the eight observations Sept. 3-17, show
that the orbit is very similar to that of (1566) Icarus:

     T = 1991 Apr. 23.613 ET          Peri. =   8.161
     e = 0.82871                      Node  = 160.645   1950.0
     q = 0.18536 AU                   Incl. =  23.543
       a =  1.08214 AU     n = 0.875551     P =   1.13 years

     1991 ET      R.A. (1950) Decl.     Delta      r        V
     Sept.11    22 03.27    -10 14.7    0.859    1.843    18.6
          16    21 51.81    -12 04.2
          21    21 42.09    -13 37.5    0.962    1.882    19.2
          26    21 34.14    -14 55.3
     Oct.  1    21 27.88    -15 59.1    1.090    1.914    19.7
           6    21 23.21    -16 50.3
          11    21 19.99    -17 30.6    1.234    1.940    20.1


AM HERCULIS
     H. Jessop, Sonoma State University; and P. A. Mason, Louisiana
State University, report that AM Her remains in its low accretion
state (cf. IAUC 5312).  Cooled CCD observations made with the Sonoma
State University 0.17-m telescope indicate that AM Her was at V = 15.1
(orbital average) and that it did not vary from this average by more
than 0.2 mag during 3.2 hr of 1-min integrations.  The observations
were centered on Sept. 5.24 UT, and the result is consistent with low-
state behavior.


1991 September 18              (5350)              Brian G. Marsden

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