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IAUC 5621: 1737 II = 1862 III = 1992t

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                                                  Circular No. 5621
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


PERIODIC COMET SWIFT-TUTTLE (1737 II = 1862 III = 1992t)
     Total visual magnitude estimates: Sept. 27.41 UT, 9.1 (D. Machholz,
Colfax, CA, 29 x 127 binoculars; 4' coma); 27.47, 9.1 (C. S. Morris, Pine
Mountain Club, CA, 0.260m reflector; diffuse and uncondensed, coma 5'.2);
27.48, 10.2 (A. Hale, Las Cruces, NM, 0.20-m reflector; coma 4').

     Ephemeris from the orbital elements on IAUC 5620:

1992 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Sept.25    11 37.16    +58 52.3    1.837    1.595   60.1   33.0      9.3
     27    11 49.18    +59 03.5    1.791    1.571   61.0   33.9      9.2
     29    12 01.95    +59 12.2    1.744    1.548   61.8   34.8      9.1
Oct.  1    12 15.47    +59 17.8    1.699    1.524   62.6   35.7      9.0
      3    12 29.78    +59 19.6    1.654    1.501   63.4   36.6      8.9
      5    12 44.86    +59 16.7    1.610    1.478   64.1   37.5      8.7
      7    13 00.69    +59 08.2    1.567    1.455   64.7   38.4      8.6
      9    13 17.22    +58 53.0    1.525    1.432   65.3   39.3      8.5
     11    13 34.37    +58 30.2    1.484    1.409   65.8   40.3      8.3
     13    13 52.05    +57 58.7    1.445    1.386   66.3   41.2      8.2
     15    14 10.11    +57 17.5    1.407    1.364   66.6   42.1      8.1
     17    14 28.39    +56 25.5    1.372    1.342   66.9   43.1      8.0
     19    14 46.72    +55 22.1    1.338    1.320   67.0   44.0      7.8
     21    15 04.94    +54 06.5    1.307    1.299   67.1   44.9      7.7
     23    15 22.86    +52 38.6    1.278    1.277   67.0   45.8      7.6
     25    15 40.35    +50 58.2    1.253    1.256   66.9   46.7      7.5
     27    15 57.26    +49 05.6    1.230    1.236   66.6   47.5      7.4
     29    16 13.49    +47 01.3    1.210    1.216   66.1   48.3      7.3
     31    16 28.98    +44 46.2    1.194    1.196   65.6   49.1      7.2
Nov.  2    16 43.69    +42 21.4    1.182    1.177   64.9   49.7      7.1
      4    16 57.59    +39 48.3    1.173    1.158   64.1   50.3      7.0

     Further reports, mainly from P. Brown and J. Rendtel of the
International Meteor Organization and referring to visual Perseid
observations this year in Okinawa, China and eastern Europe, as well as
to radio monitoring in Japan and Europe, confirm the peak as having
occurred around 1992 Aug. 11.81 UT (cf. IAUC 5586).  Although this may
indicate the next peak as occurring on 1993 Aug. 12.05 UT, observers are
cautioned that the behavior of the peaks in 1991 and 1992 with respect
to the comet's nodal longitude and now the recovery of the comet suggest
that the 1993 peak may be up to 0.1 day earlier than this.


1992 September 27              (5621)              Brian G. Marsden

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