Central Bureau for Astronomical Telegrams
IAUC 2700: 1969 II; 1973f; 1974a
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Read IAUC 2701
Circular No. 2700
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
PERIODIC COMET GUNN (1969 II)
The following improved orbital elements, by B. G. Marsden, are
from 14 observations 1970 Oct. 21 to 1974 Mar. 28. Perturbations
by Mercury to Pluto were taken into account.
Epoch = 1969 Apr. 9.0 1976 Jan. 23.0 ET
T = 1969 Apr. 18.7770 1976 Feb. 10.9595 ET
Peri. = 197.1213 197.4835
Node = 68.0350 67.9745 1950.0
Incl. = 10.3937 10.3876
q = 2.441869 2.444931 AU
e = 0.319453 0.319011
a = 3.588097 3.590264 AU
n = 0.1450133 0.1448820
P = 6.797 6.803 years
1974/75 ET R. A. (1950) Decl. Delta r Mag.
Oct. 20 11 33.24 +12 14.8 4.219 3.544 18.7
30 11 44.79 +11 12.4
Nov. 9 11 56.01 +10 13.7 4.015 3.485 18.4
19 12 06.82 + 9 19.8
29 12 17.08 + 8 31.6 3.708 3.425 18.2
Dec. 9 12 26.69 + 7 50.4
19 12 35.48 + 7 17.3 3.371 3.365 17.9
29 12 43.27 + 6 53.4
Jan. 8 12 49.87 + 6 39.7 3.024 3.304 17.6
18 12 55.04 + 6 37.4
28 12 58.55 + 6 46.9 2.693 3.243 17.3
Feb. 7 13 00.20 + 7 08.2
17 12 59.80 + 7 40.6 2.405 3.182 16.9
27 12 57.28 + 8 21.8
Mar. 9 12 52.76 + 9 08.4 2.192 3.121 16.6
19 12 46.53 + 9 55.6
29 12 39.16 +10 37.6 2.082 3.060 16.4
Apr. 8 12 31.40 +11 09.0
18 12 24.05 +11 25.4 2.082 3.000 16.4
28 12 17.87 +11 24.2
May 8 12 13.43 +11 05.1 2.118 2.941 16.4
18 12 11.05 +10 29.0
28 12 10.87 + 9 37.8 2.339 2.884 16.4
June 7 12 12.83 + 8 33.7
17 12 16.81 + 7 18.5 2.535 2.828 16.5
27 12 22.62 + 5 54.3
July 7 12 30.06 + 4 22.5 2.739 2.774 16.6
17 12 38.96 + 2 44.6
27 12 49.13 + 1 01.7 2.935 2.723 16.7
Aug. 6 13 00.45 - 0 45.0
16 13 12.81 - 2 34.6 3.110 2.674 16.7
26 13 26.11 - 4 26.1
Sept. 5 13 40.29 - 6 18.5 3.257 2.629 16.8
15 13 55.28 - 8 10.9
25 14 11.05 -10 02.3 3.369 2.588 16.8
m2 = 10.0 + 5 log Delta + 10 log r
COMET KOHOUTEK (1973f)
Dr. L. Kohoutek, Hamburg Observatory, Bergedorf, provides the
following precise positions. The Jan. 13 and 26 plates were taken
by R. Wehmeyer, and the first of these is of lower accuracy because
of the comet's large coma. Measurer: M. Dieckvoss.
1973/74 UT R. A. (1950) Decl.
Oct. 22.19757 11 10 06.17 - 5 12 15.6
31.19410 11 31 52.89 - 7 39 44.0
31.20226 11 31 54.20 - 7 39 52.2
Nov. 1.19236 11 34 31.85 - 7 57 35.5
1.20208 11 34 33.47 - 7 57 45.8
4.19271 11 42 50.10 - 8 53 15.2
4.20330 11 42 51.61 - 8 53 26.4
Jan. 13.72529 22 03 03.51 - 8 01 35.2
26.71263 0 12 43.15 + 3 41 10.4
26.72338 0 12 48.42 + 3 41 38.8
Feb. 3.74132 1 09 58.75 + 8 37 11.6
19.79722 2 25 58.64 +14 11 52.8
19.83177 2 26 06.17 +14 12 21.7
23.82431 2 39 58.90 +15 04 22.1
PERIODIC COMET FORBES (1974a)
The following precise position, by K. Tsuchiya (Asahikawa), is
from Nihondaira Obs. Circ. No. 537. Measurer: T. Urata.
1974 UT R. A. (1950) Decl. m1
Aug. 20.74792 23 48 58.4 - 9 00 42 13.5-14
Mr. J. Bortle, Brooks Observatory, provides the following total
visual magnitude estimates, obtained with a 32-cm reflector: Aug.
15.31 UT, 12.9; 16.34, 12.9.
1974 September 20 (2700) Brian G. Marsden
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