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IAUC 3102: 1977l; JUPITER XIII (LEDA); CH Cyg

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                                                  Circular No. 3102
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK     Telex: 921428
Telephone: (617) 864-5758


PERIODIC COMET CHERNYKH (1977l)
     The following precise positions have been reported:

     1977 UT             R. A. (1950) Decl.       m1     Observer
     Aug. 24.05278     0 19 58.39   - 3 25 57.3   14     Chernykh
          25.03912     0 19 49.54   - 3 29 53.3   14       "
     Sept. 2.63438     0 17 49.96   - 4 08 07.3   14     Jekabsons
           4.60417     0 17 12.12   - 4 17 46.4   14     Candy
           5.65938     0 16 50.22   - 4 23 03.0   14       "

N. S. Chernykh (Crimean Astrophysical Observatory).  Communicated
   by G. R. Kastel' (I.T.A., Leningrad) and E. P. Aksenov (Sternberg
   Astronomical Institute).  The name of Yu. P. Pskovskij was
   accidentally omitted as a communicator on IAUC 3100.
P. Jekabsons and M. P. Candy (Perth Observatory, Bickley).  33-cm
   astrograph.  Comet diffuse with condensation.

     Candy also communicates the following elliptical orbit, from
observations Aug. 24 to Sept. 5.  His ephemeris has been extended.

       T = 1978 Jan. 2.902 ET
   Peri. = 255.63                     e =   0.5228
   Node  = 132.23     1950.0          a =   5.5321 AU
   Incl. =   5.45                     n =   0.07575
       q =   2.6399 AU                P =  13.01 years

     1977 ET     R. A. (1950) Decl.     Delta     r      m1
     Aug. 25     0 19.85    - 3 29.6    1.913   2.820   13.9
     Sept. 4     0 17.41    - 4 14.8    1.834   2.795   13.8
          14     0 13.45    - 5 06.6    1.779   2.771   13.7
          24     0 08.54    - 5 59.5    1.750   2.749   13.6
     Oct.  4     0 03.42    - 6 47.2    1.747   2.729   13.6
          14    23 58.88    - 7 24.2    1.770   2.711   13.6

                   m1 = 8.0 + 5 log Delta + 10 log r


JUPITER XIII (LEDA)
     K. Aksnes, Center for Astrophysics, provides the following
continuation to the ephemeris on IAUC 2968:

     1977/78 ET  R. A. (1950) Decl.   dR.A.   dDecl.  Delta     r
     Aug. 25     5 58.80    +23 17.0  -2m77   +14'6   5.534   0.071
     Sept. 4     6 05.82    +23 11.9  -2.38   + 9.9   5.410   0.068
          14     6 12.12    +23 04.9  -1.79   + 3.9   5.275   0.065
          24     6 17.56    +22 56.5  -1.01   - 3.0   5.131   0.063
     Oct.  4     6 21.98    +22 48.0  -0.07   -10.2   4.979   0.062
          14     6 25.18    +22 40.7  +0.96   -16.9   4.822   0.062
          24     6 26.95    +22 35.7  +1.95   -22.0   4.666   0.064
     Nov.  3     6 27.15    +22 33.8  +2.82   -25.0   4.517   0.066
          13     6 25.68    +22 35.3  +3.45   -25.4   4.380   0.069
          23     6 22.57    +22 39.9  +3.78   -23.3   4.264   0.072
     Dec.  3     6 18.00    +22 47.0  +3.78   -19.1   4.172   0.076
          13     6 12.26    +22 55.6  +3.45   -13.2   4.112   0.079
          23     6 05.79    +23 04.6  +2.82   - 6.4   4.085   0.081
     Jan.  2     5 59.10    +23 13.2  +1.97   + 0.6   4.094   0.083
          12     5 52.74    +23 20.7  +0.99   + 7.3   4.139   0.085
          22     5 47.20    +23 26.9  -0.01   +13.1   4.217   0.086
     Feb.  1     5 42.87    +23 32.1  -0.96   +17.8   4.324   0.087
          11     5 40.01    +23 36.3  -1.77   +21.4   4.455   0.087
          21     5 38.76    +23 39.9  -2.43   +23.7   4.607   0.087
     Mar.  3     5 39.12    +23 42.9  -2.92   +24.9   4.772   0.086
          13     5 41.06    +23 45.3  -3.22   +25.0   4.945   0.084
          23     5 44.47    +23 46.8  -3.36   +24.1   5.122   0.082
     Apr.  2     5 49.20    +23 47.1  -3.34   +22.2   5.298   0.079
          12     5 55.13    +23 45.9  -3.16   +19.2   5.469   0.076
          22     6 02.10    +23 42.7  -2.85   +15.2   5.630   0.073


CH CYGNI
     Ch. Fehrenbach, Haute Provence Observatory, reports: "CH Cyg
was observed on Sept. 2, 3 and 4 by Y. Andrillat and R. Faraggiana
in the red and near infrared (range 5800-11 000 A, dispersion 230
A/mm, 193-cm and 120-cm telescopes) and in the blue-green (range
3400-5030 A, dispersion 12.4 A/mm, 152-cm telescope).  In the blue
region a continuum comparable to that observed in 1967 is present.
From visual inspection it appears that the Balmer series, detectable
to about H18, is present in absorption with emission wings,
broader on the violet side.  The emission wings of the H and K
lines of Ca II are broader on the red side.  He I 5016 A and 3888 A
(metastable levels) and [S II] 4068 A are present in emission.  Fe
II 4233 A emission has an intensity comparable to that of [Fe II]
4243 A.  Weak, sharp emission lines are visible on the violet side
of the Balmer jump.  The red and near-infrared regions are
dominated by the strong molecular bands of TiO at 8859, 8432, 8344,
7828, 7672, 7628, 7589, 7198, 7126, 7088, 7054, 6651, 6158 and
5809 A.  Only H-alpha is present in emission.  Two lines of the Ca II
triplet (8662 and 8542 A) are visible, the third being blended with
a TiO band.  It is interesting to remark that athough the metastable
lines are present, He I 10 830 A is not visible on our spectrograms.
No other lines of He I are visible, and they are probably
too faint to be detected on small-dispersion spectrograms."


1977 September 7               (3102)              Brian G. Marsden

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