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IAUC 3523: 1980o; (201); COMMUNICATIONS BREAKDOWN

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IAUC number 

                                                  Circular No. 3523
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


PERIODIC COMET RUSSELL 2 (1980o)
     K. S. Russell, U.K. Schmidt Telescope Unit, communicates the
following positions, derived from plates exposed by A. Savage:

     1980 UT             R. A. (1950) Decl.
     Oct.  3.40961    21 45 08.09   -31 20 33.3
           6.43113    21 45 44.37   -30 50 49.6

     The following elliptical orbital elements have been derived by
the undersigned from observations Sept. 28-Oct. 6:

       T = 1980 May 12.810 ET
   Peri. = 242.58                     e =   0.4262
   Node  =  44.44   1950.0            a =   3.7252 AU
   Incl. =  12.55                     n =   0.13708
      q  =   2.1374 AU                7.19 years

     1980 ET     R. A. (1950) Decl.     Delta     r      m1
     Sept.28    21 44.67    -32 11.2
     Oct.  8    21 46.15    -30 35.0    1.720   2.408   17.0
          18    21 50.20    -28 49.6
          28    21 5&.46    -26 58.2    1.995   2.476   17.4
     Nov.  7    22 04.54    -25 02.7
          17    22 14.10    -23 04.5    2.303   2.549   17.9


(201) PENELOPE
     J. V. Lambert, New Mexico State University; and J. Africano,
Cloudcroft Observatory, write: "Observations of (201) Penelope on
Aug. 23 and 24 and Sept. 2 and 13 from the Cloudcroft Observatory
have revealed an unusually short rotation period and high lightcurve
amplitude.  The rotation period of 3.747 hours is the second
shortest yet observed for a main-belt minor planet.  Observed
lightcurve amplitudes were 0.75 mag on Aug. 24, 0.6 mag on Sept. 2 and
0.3 mag on Sept. 13.  The light-curve amplitude is expected to
increase with increasing phase angle after opposition (Sept. 24)."


COMMUNICATIONS BREAKDOWN
     A change in Western Union's TWX system caused the Central Bureau's
TWX machines to be inoperative for an interval of at least 36
hours on Oct. 5-7.  The problem seems now to have been rectified.


1980 October 8                 (3523)              Brian G. Marsden

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