Central Bureau for Astronomical Telegrams
IAUC 2884: 1975q; P/GUNN; 1975d
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Read IAUC 2885
Circular No. 2884
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 SATO (1975q)
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. m1 Observer
Dec. 10.4896 12 18 16.0 + 7 34 29 Harlan
10.53333 12 18 18.09 + 7 25 54.3 Giclas
10.80660 12 18 31.00 + 6 31 36.2 10 Koishikawa
10.82141 12 18 31.68 + 6 28 49.4 "
11.42294 12 19 01.77 + 4 23 18.4 McCrosky
11.52569 12 19 07.47 + 4 01 01 Jones
12.36950 12 19 54.08 + 0 47 34.9 Schwartz
13.23295 12 20 46.56 - 2 50 26.8 8 Waterfield
E. A. Harlan (Lick Observatory). 10-cm f/3 camera. Measurer:
A. R. Klemola.
H. L. Giclas (Lowell Observatory). Measurer: M. L. Kantz.
M. Koishikawa (Sendai Observatory, Ayashi Station).
R. E. McCrosky and G. Schwartz (Harvard Observatory, Agassiz Station).
155-cm reflector. Measurer: C. Y. Shao. Strong condensation.
Tail ~ 4' in p.a. ~ 295o on Dec. 11; m2 ~ 14 on Dec. 12.
B. Jones (Lick Observatory). 51-cm double astrograph. Measurer:
Klemola. Declination somewhat uncertain.
R. L. Waterfield (Woolston Observatory). Comet diffuse with
condensation, no tail. Communicated by S. W. Milbourn.
The following improved elements, determined by the undersigned
from 9 observations Dec. 9-13, closely confirm those by Z. Sekanina
on IAUC 2883:
T = 1976 Jan. 3.936 ET Peri. = 215.487
Node = 280.785 1950.0
q = 0.86393 AU Incl. = 93.969
1975/76 ET R. A. (1950) Decl. Delta r m1
Dec. 18 12 28.38 -29 18.6 0.286 0.918 7.9
19 12 30.96 -35 55.4
20 12 34.13 -42 36.8 0.282 0.907 7.8
21 12 38.10 -49 12.0
22 12 43.18 -55 31.0 0.294 0.896 7.9
23 12 49.83 -61 25.9
24 12 58.84 -66 51.4 0.319 0.887 8.0
25 13 11.6 -71 44.5
26 13 30.5 -76 03.8 0.354 0.880 8.2
27 14 00.9 -79 47.0
28 14 53.9 -82 48.2 0.397 0.873 8.4
29 16 28.8 -84 48.6
30 18 42 -85 16.7 0.445 0.869 8.6
31 20 28.4 -84 19.6
Jan. 1 21 29.1 -82 45.9 0.497 0.866 8.9
2 22 03.3 -81 04.6
3 22 24.3 -79 25.9 0.551 0.864 9.1
m1 = 11.0 + 5 log Delta + 10 log r
PERIODIC COMET GUNN
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. Observer
Jan. 13.27810 12 52 48.86 + 6 36 58.5 Torres
14.28360 12 53 19.48 + 6 36 49.3 "
Apr. 15.21608 12 26 02.24 +11 22 21.8 "
18.21347 12 23 56.02 +11 25 23.2 "
20.21580 12 22 35.31 +11 26 31.3 "
June 12.03409 12 14 37.22 + 7 56 54.3 "
12.12904 12 14 39.54 + 7 56 08.8 Schwartz
12.99846 12 15 00.89 + 7 49 35.9 Torres
C. Torres (University of Chile, Cerro El Roble Station).
G. Schwartz (Harvard Observatory, Agassiz Station). Measurer: Shao.
COMET BRADFIELD (1975d)
C. Torres, University of Chile, provides the following precise
positions, obtained with the Maksutov astrograph at Cerro El Roble.
Observers were Torres, S. Barros and H. Moreno.
1975 UT R. A. (1950) Decl.
Mar. 15.01539 1 15 45.63 -21 49 24.4
16.01444 1 19 40.52 -21 42 09.8
17.01595 1 23 37.29 -21 34 32.4
Apr. 18.00063 3 42 08.12 -14 26 36.8
20.00054 3 51 10.40 -13 49 04.8
May 7.01872 5 06 17.34 - 8 09 51.0
7.99957 5 10 27.00 - 7 50 13.0
June 12.97590 7 23 08.48 + 1 50 11.3
1975 December 16 (2884) Brian G. Marsden
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