Central Bureau for Astronomical Telegrams
IAUC 2800: 1975h
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Circular No. 2800
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)
Further precise positions have been reported as follows:
1975 UT R. A. (1950) Decl. m2 Observer
July 7.58160 21 31 31.22 - 0 19 10 7.5 Seki
7.59063 21 31 29.14 - 0 18 15 "
8.67743 21 26 59.10 + 1 46 07.2 7 Kojima
8.78576 21 26 29.23 + 1 59 27.1 7.2 Seki
11.07804 21 14 43.04 + 7 14 09.5 6 Milet
11.10124 21 14 34.54 + 7 17 42.9 "
12.32645 21 06 44.59 +10 38 52.9 Helin
12.43582 21 05 57.98 +10 57 54.8 "
14.65521 20 47 48.16 +18 12 48.0 6 Tomita
16.40573 20 28 51.48 +24 58 17.5 Giclas
16.41285 20 28 46.08 +25 00 01.9 "
T. Seki (Kochi Observatory, Geisei Station).
N. Kojima (Ishiki). Measurer: H. Kosai. Comet diffuse with
condensation. Communicated by K. Osawa.
B. Milet (Nice Observatory). Comet diffuse with condensation, tail
< 1o.
E. Helin (Palomar Mountain Observatory). 46-cm Schmidt telescope.
Measurer: S. J. Bus. 20-min and 3-min exposures.
K. Tomita (Tokyo Astronomical Observatory). Comet diffuse with
condensation. Communicated by K. Osawa.
H. L. Giclas (Lowell Observatory). 33-cm photographic telescope.
Measurer: Mary Lou Kantz. Tail ~ 20' long in p.a. 200o.
The following improved parabolic elements, by the undersigned,
are based on 19 observations July 6 to 16:
T = 1975 Sept. 5.341 ET Peri. = 116.968
Node = 295.652 1950.0
q = 0.42568 AU Incl. = 80.774
1975 ET R. A. (1950) Decl. Delta r m1
July 19 19 49.88 +36 14.0 0.264 1.180 5.3
21 19 07.37 +44 54.3
23 18 11.62 +52 10.1 0.265 1.108 5.1
25 17 05.01 +56 53.3
27 15 56.84 +58 47.2 0.306 1.035 5.1
29 14 57.55 +58 32.1
31 14 11.24 +57 05.8 0.373 0.961 5.2
Aug. 2 13 36.48 +55 11.3
4 13 10.31 +53 11.3 0.453 0.887 5.3
6 12 50.15 +51 16.0
8 12 34.14 +49 28.7 0.540 0.812 5.3
10 12 21.03 +47 49.8
12 12 09.94 +46 18.4 0.631 0.738 5.2
14 12 00.30 +44 52.9
16 11 51.69 +43 31.9 0.723 0.665 5.0
18 11 43.82 +42 13.6
20 11 36.47 +40 56.4 0.817 0.596 4.8
22 11 29.51 +39 38.6
24 11 22.83 +38 18.6 0.909 0.532 4.6
26 11 16.38 +36 54.7
28 11 10.13 +35 25.4 1.001 0.478 4.3
30 11 04.12 +33 49.3
Sept. 1 10 58.39 +32 05.4 1.088 0.441 4.1
3 10 53.03 +30 13.0
5 10 48.11 +28 12.3 1.168 0.426 4.1
The following selected total visual magnitude estimates and
coma diameters have been reported: July 8.17 UT, 6.6, 14' (J. E.
Bortle, Brooks Observatory, 10 x 50 binoculars); 8.27, 6.9, 20'
(C. Morris, West Lafayette, Indiana, 8 x 52 elbow telescope); 8.77,
8.1, - (V. L. Matchett, Indooroopilly, Queensland, 7 x 50 binoculars);
9.56, 7.2, 16' (B. Sumner, Brisbane, Queensland, 7 x 50 binoculars);
10.20, 6.3, 12' (K. Simmons, Jacksonville, Florida, 14 x
100 binoculars); 10.30, 5.7, 25' (D. Milon, Yellowstone National
Park, Wyoming, 7 x 35 binoculars); 10.52, 7.1, 18' (Sumner); 10.79,
6.7, - (Matchett); 12.58, 5.8, 16' (J. Mikolas, near Weaverville,
California, 10 x 50 binoculars); 13.4, 6.1, - (J. Young, Table
Mountain, California, 10 x 50 binoculars, tail 0o.25; tail 1o in p.a.
205o photographically); 14.09, 5.6, 25'-30' (Bortle); 14.4, 5.8, -
(Young); 15.24, 7.0, 8' (C. Sherrod; North Little Rock, Arkansas,
15-cm reflector); 15.35, 5.9, - (Simmons); 16.21, 5.7, 10'-12' (P.
Maley, Houston, Texas, 7 x 35 binoculars); 16.28, 6.1, - (Sherrod);
17.2, 6.4, 15' (Sherrod).
Dr. W. Schlosser, Eumpean Southern Observatory, reports the
following photoelectric observations, obtained with a 45" diaphragm
on the 61-cm Bochum reflector:
1975 UT V B - V U - B 1975 UT V B - V U - B
July 9.32 10.34 +0.57 -0.08 July 11.25 10.10 +0.59 -0.01
10.28 10.25 +0.56 -0.01 13.28 9.89 +0.58 -0.05
With a 28" diaphragm the values were systematically shifted by dV =
+0.64, d(B - V) = +0.01, d(U - B) = +0.05.
1975 July 18 (2800) Brian G. Marsden
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