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IAUC 5604: 1992r; FG Sge

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                                                  Circular No. 5604
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 TUTTLE (1992r)
     G. Tancredi and M. Lindgren report their recovery of this comet
on CCD exposures with the Nordic Optical Telescope, La Palma.  The
object is of stellar appearance, and the magnitudes are V.

     1992 UT             R.A. (2000) Decl.        m2
     July 29.06250   20 05 39.19   +31 35 56.8   21.2
          29.14236   20 05 36.12   +31 35 59.6   21.3
          29.97188   20 05 01.70   +31 35 49.9   21.4
          30.89896   20 04 23.08   +31 35 30.9   21.2
          31.19896   20 04 10.51   +31 35 23.5   21.4

     The prediction on MPC 18257 requires correction by delta T = -1.7
days.  The following orbital elements, by the undersigned, satisfy 49
observations 1980-1992 with mean residual 1".0:

                    Epoch = 1994 June 17.0 TT
     T = 1994 June 25.2907 TT         Peri. = 206.7030
     e = 0.824089                     Node  = 270.5485  2000.0
     q = 0.997732 AU                  Incl. =  54.6923
       a =  5.671812 AU    n = 0.0729661    P =  13.508 years

1992 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m2
Aug. 26    19 47.58    +30 37.5    5.504    6.140  125.0    7.7     21.2
Sept. 5    19 42.49    +29 53.8    5.507    6.085  120.8    8.2     21.2
     15    19 38.53    +29 01.9    5.527    6.029  115.5    8.7     21.2
     25    19 35.82    +28 04.9    5.561    5.973  109.6    9.1     21.2
Oct.  5    19 34.45    +27 05.7    5.606    5.916  103.3    9.5     21.2
     15    19 34.42    +26 07.0    5.659    5.859   96.7    9.7     21.2
     25    19 35.67    +25 11.4    5.716    5.801   90.0    9.9     21.2
Nov.  4    19 38.15    +24 20.9    5.774    5.743   83.3    9.9     21.2


FG SAGITTAE
     J. Papousek, Brno University Observatory, reports: "In contrast
to the relatively small light changes over V = 9.0-9.3 during the past
20 years, recent photometry shows this variable to be sharply
declining in brightness: Sept. 2.88 UT, V = 10.05 +/- 0.01, B-V =
+1.80 +/- 0.01."  Visual magnitude estimates by B. H. Granslo,
Fjellhamar, Norway (also provided by the AAVSO): Aug. 7.03 UT, 9.2;
19.00, 9.3; 24.91, 9.4; 31.95, 9.6.


1992 September 4               (5604)              Brian G. Marsden

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