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IAUC 2815: 1975h

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                                                  Circular No. 2815
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
Western Union: RAPID SATELLITE CAMBMASS


COMET KOBAYASHI-BERGER-MILON (1975h)
     Dr. A. C. Danks, Department of Astronomy, University of Texas
at Austin, writes: "The following molecular bands have been identified
in a spectrogram of comet 1975h obtained with the coude scanner
of the 210-cm telescope at the McDonald Observatory on July 28.
The spectrograph slit was 7" x 42" centered on the nucleus.  The
spectral resolution was 8 A; the scan duration was 5 min and
covered the spectral region 3000-6000 A.  The emissions are: OH (0,0)
3095.6 A; OH (1,1) 3153.2 A; NH (0,0) 3358.9 A; CN (0,0) 3883 A; C3
4050 A band; CN (0,1) 4216 A; CH (0,0) 4280.7 A; C2 Delta-v = +2, +1, 0, -1
and -2 at 4383, 4131, 5165, 5635 and 5961.5 A, respectively; NH2
(0,11,0), (0,10,0) and (0,9,0) at 5538, 5100 and 6000 A, respectively.
Two weak unidentified bands were seen at 4841 and 4964 A.
The observations and identifications were made by A. Danks, A.
Grauer, L. Trafton, R. Tull and J. Woodman."

     The following precise positions have been reported:

     1975 UT             R. A. (1950) Decl.        m1    Observer
     July 15.64314    20 37 42.82   +21 55 16.6    6.5   Kurosaki
          15.85841    20 35 19.12   +22 45 49.3    6     Chernykh
          15.81896    20 35 05.11   +22 50 43.8            "
          11.64093    20 12 12.62   +30 12 36.5          Kurosaki
          11.66038    20 11 55.32   +30 17 40.8            "
          25.94065    16 32 20.22   +58 06 16.2    8.0   Debehogne
          25.98226    16 30 54.30   +58 08 36.1            "
          21.99336    15 25 45.85   +58 51 44.9    8.0     "
          28.01466    15 25 07.11   +58 51 30.0          Milet
          28.02245    15 24 53.13   +58 51 26.7          Debehogne
          28.03024    15 24 40.26   +58 51 21.4          Milet
          28.96145    14 58 20.14   +58 32 39.5    7.5   Debehogne
          28.99168    14 51 41.79   +58 31 54.4            "
          29.93813    14 34 08.52   +51 56 54.7            "
          29.98190    14 32 59.81   +51 54 43.4            "
          30.85410    14 14 01.92   +51 13 08.1          Milet
          30.81591    14 13 40.95   +51 11 51.3            "
          30.91094    14 12 58.12   +51 10 07.6          Debehogne
          30.93941    14 12 23.62   +57 08 34.2            "
     Aug.  1.91635    13 31 41.51   +55 15 46.8            "
           1.95029    13 31 10.80   +55 13 42.4            "
           2.88488    13 23 58.09   +54 11 34.6            "
           2.91812    13 23 31.94   +54 15 29.6            "
           3.86846    13 11 46.11   +53 18 38.6          Milet
           3.88651    13 11 34.14   +53 17 33.1            "

T. Kurosaki (Utsunomiya).  20-cm f/6.2 reflector.  From Orient.
   Astron. Assoc. Comet Bull. No. 109.
N. S. Chernykh (Crimean Astrophysical Observatory).  Reduced at
   I.T.A., Leningrad.  Communicated by G. R. Kastel'.
H. Debehogne (Royal Observatory, Uccle).  40-cm f/5 double astrograph.
   Measurers: Debehogne and G. Roland.
B. Milet (Nice Observatory).  40-cm double astrograph.

     The following continuation to the ephemeris is from the orbital
elements on IAUC 2813:

     1975 ET     R. A. (1950) Decl.     Delta     r      m1
     Aug. 26    11 16.34    +36 54.3    0.955   0.503    4.4
          31    11 01.18    +32 57.9
     Sept. 5    10 48.01    +28 11.6    1.168   0.426    4.1
          10    10 38.20    +22 39.8
          15    10 31.99    +16 45.3    1.320   0.494    5.0
          20    10 28.80    +10 50.1
          25    10 27.71    + 5 05.6    1.416   0.653    6.4
          30    10 21.93    - 0 24.8
     Oct.  5    10 28.95    - 5 41.3    1.483   0.837    7.6
          10    10 30.37    -10 44.8
          15    10 31.95    -15 36.7    1.542   1.022    8.5
          20    10 33.49    -20 18.1
          25    10 34.84    -24 49.8    1.598   1.204    9.3
          30    10 35.85    -29 12.4
     Nov.  4    10 36.38    -33 26.3    1.658   1.319   10.0
           9    10 36.21    -31 31.3
          14    10 35.35    -41 21.3    1.723   1.548   10.6
          19    10 33.43    -45 13.9
          24    10 30.31    -48 50.4    1.796   1.712   11.1

     Further selected total visual magnitude estimates, coma diameters
and tail information: Aug. 1.94 UT, 4.8, 10', 60' in p.a. 95o-110o
(G. E. D. Alcock, Peterborough, England, 25 x 105 binoculars);
2.95, 4.8, 6', 60' in 85o (N. A. v.d. Mey, Soesterberg, The Netherlands,
8 x 30 binoculars); 3.95, 4.5, 10', ~ 10' (K. Andersson and
T. Jurisoo (Stockholm, Sweden, 12 x 80 binoculars); 4.2, 4.7, -, 60'
(R. Keen, Boulder, Colorado, 6 x 30 binoculars); 1.11, 4.9, 13',
270' (C. Morris, West Lafayette, Indiana, 8 x 52 elbow telescope);
8.14, 4.9, 10', 180' (Morris); 9.1, 4.7, 9', 255' in 70o (J. Bortle,
Brooks Observatory, 10 x 50 binoculars); 10.1, 4.8, 9', 285' in 67o
(Bortle); 11.19, 4.0, -, 360' (N. J. Mayo and J. Truxton, Agoura,
California, 7 x 35 binoculars).


1975 August 13                 (2815)              Brian G. Marsden

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