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IAUC 4098: 1985 PA

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                                                  Circular No. 4098
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 617-495-7244/7440/7444


1985 PA
     Further precise positions have been reported as follows:

1985 UT           R.A.  (1950.0)  Decl.     Mag.   Observer

Aug. 18.17665   22 28 06.86   -12 52 38.1   16.5   Schwartz
     19.03212   22 26 20.33   -13 57 38.4          Barthelemy
     19.03906   22 26 19.55   -13 58 09.0            "
     19.38958   22 25 34.54   -14 25 01.7          Singer-Brewster
     20.44514   22 23 18.26   -15 46 34.6            "
     21.26493   22 21 30.04   -16 50 43.7            "
     24.38659   22 14 10.45   -20 58 13.6   16.0   Gehrels
     24.40392   22 14 07.80   -20 59 36.8            "
     25.50625   22 11 24.28   -22 27 34.5          Tokunaga
     27.34451   22 06 43.10   -24 54 00.8          Gehrels
     27.35559   22 06 41.28   -24 54 53.5            "
     27.36802   22 06 39.30   -24 55 52.3            "

G. Schwartz and C.-Y. Shao (Oak Ridge).  Correction to IAUC 4093.
A. Barthelemy (Caussols).  Measurer: C. Pollas.
S. Singer-Brewster, D. Schneeberger, M. Rudnyk and M. Gallup (Palomar).
   0.46-m Schmidt.  Measurer: Rudnyk (who also assisted with
   the 0.46-m Schmidt measures on IAUC 4093).  The Aug. 19 position
   refers to the beginning of the trail.  Communicated by E. Helin.
T. Gehrels (Kitt Peak).  SPACEWATCH camera 0.91-m telescope.
   Measurement and reduction by J. V. Scotti.
A. Tokunaga, D. M. Griep and W. F. Golisch (Infrared Telescope
   Facility, Mauna Kea).  Communicated by D. J. Tholen.

     Tholen also reports that his photometry showed 1985 PA on
Aug. 24 near V = 15.3 and steady; on Aug. 25 at V = 15.3, 15.5 and
15.6 (fading); and on Aug. 26 at V = 16.2 and 16.0 (brightening).
The amplitude is presumably close to 1.0 mag, and preliminary
analysis suggests that the period might be 8 days, although a period
of just under 1 day cannot be ruled out.  Further photometry from
southern-hemisphere observers would be useful.

     Improved orbital elements from 14 observations Aug. 15-27:

          T = 1986 Feb. 5.327 ET
      Peri. = 310.633                    e =   0.30067
      Node  = 147.392   1950.0           a =   1.43123 AU
      Incl. =  56.300                    n =   0.575626
          q =   1.00090 AU               P =   1.71 years


1985 August 28                 (4098)              Brian G. Marsden

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