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IAUC 2818: 1975h; 1974f

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                                                  Circular No. 2818
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)
     C. Lillie and G. Emerson, Laboratory for Atmospheric and Space
Physics, University of Colorado, report that observations during
July 19-Aug. 5 using the 61-cm reflector at Mount Evans Observatory
and a scanning spectrometer (covering the range 3000-5800 A) show
strong emission from the OH (0,0) band at 3090 A.  When the results
are rectified, this band was found to be four times as intense as
the CN (0,0) 3883 A band on July 27 and twice as intense as CN on
Aug. 5.  On the latter date the CN band was four times as intense
as NH (0,0) 3360 A, which was in turn 20 times as intense as OH
(1,1) 3140 A.  The C3 group at 4050 A, CN (0,1) 4216 A, CH (0,0) 4300 A,
the C2 Swan bands at 4380, 4737 and 5165 A, and possibly [O I]
5577 A, were also observed.  The weak continuum reached its peak
near 4000 A but could be detected down to 3300 A.

     P. A. Wehinger and S. Wyckoff, Wise Observatory, write:
"Strongly exposed image-tube spectra (dispersions 150 and 240 A/mm)
covering the range 3000-9000 A were obtained on Aug. 8.7 and 9.7 UT
(r ~ 0.8 AU, Delta ~ 0.6 AU) using the 100-cm reflector.  Superimposed
on a very weak solar continuum are very strong emission bands of C2
(Delta-v = +1, 0 and -1 Swan sequences) and CN (3883 A) that extend
symmetrically on either side of the nucleus for more than 3 x 10**5 km.
Also present were strong emission bands of CN (3590, 4216 A), C3
(4050 A), C2 (Delta-v = +2 and -2 Swan sequences) and NH (3360 A); while
emission bands of OH (3090, 3138 A), CH (4315 A), NH2 (12,0 through
5,0) and CN (red system: 2,0 and 3,1) were present with moderate
strength.  Lines of the H2O+ 8,0 (6158, 6199, 6210 A) and 6,0
(6987, 7040, 7054 A) sub-bands were weakly present and were the
only tail features observed."

     Further precise positions have been reported as follows:

     1975 UT             R. A. (1950) Decl.        m1    Observer
     July 13.57118    20 57 23.01   +14 29 07.5          Suzuki
          14.58646    20 48 28.08   +17 57 59.8            "
          14.62257    20 48 07.20   +18 05 46.2            "
          15.61007    20 38 05.01   +21 47 28.6            "
          17.70104    20 11 18.52   +30 28 19.9            "
          18.71285    19 54 57.65   +34 56 52.3          Taguchi
          18.72873    19 54 41.11   +35 01 03.8            "
          26.57361    16 10 49.90   +58 35 36.9    5     Urata
          26.57685    16 10 43.47   +58 35 44.0            "
          27.93087    15 27 38.38   +58 52 20.6    4.5   Aarnio
          29.13438    14 53 57.52   +58 27 37.4          Bojanowski
          29.22257    14 51 40.64   +58 24 43.8          Giclas
          29.24618    14 51 04.03   +58 23 55.4            "
          30.53958    14 20 41.76   +57 29 00.4          Kasahara
          30.54236    14 20 38.33   +57 28 53.6            "
          30.54514    14 20 35.48   +57 28 44.4          Odagiri
          30.54792    14 20 31.50   +57 28 36.2            "
          31.22882    14 06 40.00   +56 53 09.6          Giclas
     Aug.  2.09514    13 35 01.40   +55 05 12.6          Bojanowski
           4.51748    13 04 33.71   +52 40 19.4    5     Urata
           4.52237    13 04 30.51   +52 40 01.0            "
           6.17378    12 48 34.70   +51 05 51.9          Giclas

K. Suzuki (JCPM Oi) and T. Urata (Nihondaira Observatory).  Measurer:
   Urata.  From Nihondaira Obs. Circ. No. 677.
T. Taguchi (JCPM Sapporo).  Measurer: M. Takeishi.  Long. = -141o22'52",
   Lat. = +43o05'25", h = 10 m.  From Nihondaira Obs. Circ. No. 677.
J. J. Aarnio and R. L. Waterfield (Woolston Observatory).  Measurer:
   Waterfield.  A plate by G. H. Rutter on Aug. 4.0 shows a 7o tail
   in p.a. 86o; one on Aug. 10.0 shows an 11o tail in p.a. 70o.
Jo-Ann Bojanowski and P. Collins (Harvard College Observatory).
   41-cm Metcalf astrograph.  Measurer: Bojanowski
H. L. Giclas (Lowell Observatory).  33-cm photographic telescope.
   Measurer: Mary Lou Kantz.  A 30-min exposure on Aug. 6.2 shows a
   tail > 6o long in p.a. 76o.
S. Kasahara and S. Odagiri (Sendai Astronomical Observatory).  From
   Nihondaira Obs. Circ. No. 677.

     Further selected total visual magnitude estimates, coma diameters
and tail information: Aug. 4.87, 5.0, -, - (M. Antal, Skalnate
Pleso Observatory, 25 x 100 binoculars); 6.05, 5.0, -, - (K.
Simmons, Switzerland, Florida, 7 x 50 binoculars); 7.27, 4.2, 6', 4o
in p.a. 75o (J. Mikolas, Chico, California, 10 x 50 binoculars);
8.11, 4.2, 17', 105' in 70o (C. Sherrod, North Little Rock, Arkansas,
7 x 50 binoculars); 9.12, 4.5, 18', 90' in 65o (Sherrod);
10.08, 4.6, -, - (P. Collins, Harvard Observatory, 7 x 50 binoculars);
11.06, 5.1, -, - (Simmons); 12.21, 4.0, 10', > 7o (M. J.
Mayo, Lockwood Valley, California, 7 x 35 binoculars); 15.12, 4.9,
10', > 2o.5 in 55o (P. Maley, Houston, Texas, 7 x 35 binoculars);
17.11, 4.9, 10', > 1o in 50o (Maley); 18.11, 4.9, 10', - (Maley).


PERIODIC COMET HONDA-MRKOS-PAJDUSAKOVA (1974f)
     C. Torres, University of Chile, provides the following precise
position, obtained with the Maksutov astrograph at the Cerro El
Roble Station:

     1974 UT             R. A. (1950) Decl.
     Dec. 13.04676    20 03 47.93   -14 37 33.9


1975 August 19                 (2818)              Brian G. Marsden

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