Central Bureau for Astronomical Telegrams
IAUC 2905: 1976 AA; 1975n; theta1 Ori A; CI Cyg
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Read IAUC 2906
Circular No. 2905
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
1976 AA
The following precise positions have been reported:
1976 UT R. A. (1950) Decl. Mag. Observer
Jan. 8.24983 6 49 55.43 +17 12 48.6 Burkhead
9.25174 6 44 07.50 +19 30 27.6 "
10.08685 6 39 05.95 +21 26 47.5 Bulger
10.15833 6 38 38.03 +21 36 54.3 "
11.16164 6 32 18.82 +23 58 22.0 McCrosky
11.25240 6 31 41.57 +24 11 08.2 Shao
11.73981 6 28 29.30 +25 20 07.8 13.5 Urata
11.74271 6 28 28.11 +25 20 29.7 "
12.75071 6 21 42.31 +27 42 50.4 "
12.75856 6 21 39.10 +27 43 54.2 13.5 "
13.13237 6 19 09.16 +28 36 34.8 "
13.15763 6 18 57.99 +28 40 06.5 McCrosky
13.78142 6 14 31.08 +30 06 58.7 Shao
13.78356 6 14 30.05 +30 07 17.1 13.5 Urata
14.14931 6 12 01.20 +30 58 13.2 "
14.27084 6 11 05.84 +31 15 06.1 Young
19.41782 5 31 18.31 +42 08 45.1 "
19.41933 5 31 17.45 +42 08 54.0 14 Urata
M. S. Burkhead (Palomar Mountain Observatory) 122-cm Schmidt
telescope. Measurer: J. Sanders. Communicated by E. Helin.
J. H. Bulger, R. E. McCrosky and C. Y. Shao (Harvard College
Observatory). 155-cm reflector. Measurer: Shao.
T. Urata (JCPM Jakiimo Station). 20-cm f/5.5 reflector.
J. Young (Table Mountain Observatory). Measurer: S. J. Bus.
The following improved orbital elements, by the undersigned,
are from 27 observations Jan. 7 to 19:
T = 1976 May 20.269 ET
Peri. = 147.866 e = 0.18158
Node = 108.099 1950.0 a = 0.96600 AU
Incl. = 18.758 n = 1.0381
q = 0.79059 AU P = 0.949 year
1976 ET R. A. (1950) Decl. Delta r Mag.
Jan. 27 4 27.57 +53 25.1 0.149 1.071 15.2
29 4 11.16 +55 26.6
31 3 55.32 +57 09.1 0.164 1.062 15.5
Feb. 2 3 40.21 +58 35.3
4 3 25.90 +59 47.9 0.180 1.052 15.8
6 3 12.44 +60 49.4
8 2 59.83 +61 41.9 0.196 1.042 16.1
10 2 48.02 +62 26.9
12 2 36.96 +63 06.0 0.212 1.031 16.4
14 2 26.58 +63 40.1
16 2 16.80 +64 10.0 0.228 1.020 16.6
18 2 07.56 +64 36.5
20 1 58.79 +64 59.8 0.243 1.008 16.8
22 1 50.43 +65 20.5
Mag. = 18.0 + 5 log Delta + 5 log r + 0.023 (phase angle)
COMET WEST (1975n)
The following precise positions have been reported:
1975/76 UT R. A. (1950) Decl. m2 Observer
Dec. 24.78333 20 57 01.39 -36 06 04.1 Hers
27.76736 21 01 32.89 -35 42 37.2 "
Jan. 4.39847 21 14 14.42 -34 37 12.9 11.0 Gilmore
9.76701 21 24 10.68 -33 45 15.7 Hers
J. Hers (Randburg, near Johannesburg). 20-cm reflector.
A. C. Gilmore (Carter Observatory). 41-cm reflector. Measurer:
P. M. Kilmartin. The values of m2 given on IAUC 2894 should
be amended to: Nov. 28.39, 14.5; 30.38, 14.1; Dec. 5.40, 13.8.
Total visual magnitude estimates: 1975 Dec. 23.43 UT, 9.5 (A.
Jones, Nelson, New Zealand, 7.8-cm refractor); 30.42, 8.7 (Jones);
1976 Jan. 7.47, 7.5-8 (M. Owada, Japan, 6.5-cm refractor, 12 x).
theta1 ORIONIS A
J. Bortle, Brooks Observatory, reports that a preliminary
reduction of over 100 visual magnitude estimates provided by members
of the AAVSO, RASNZ and Sky and Telescope yields the time of
mid-minimum of the recent eclipse (cf. IAUC 2859, 2881) as 1975 Dec.
5.51 +/- 0.03 UT; the eclipse probably lasted for about 0.8 day.
CI CYGNI
Recent visual magnitude estimates (cf. IAUC 2881): 1975 Dec.
6.01 UT, 9.9 (J. Bortle, Brooks Observatory); 12.1, 9.6 (Bortle);
15.2, 9.4 (R. Annal, Barstow, California); 21.9, 9.3 (J. Bauer,
West Germany); 24.7, 9.1 (Bauer); 1976 Jan. 2.00, 9.4 (Bortle);
11.00, 9.4 (Bortle); 15.00, 9.4 (Bortle); 20.1, 9.2 (Annal).
1976 January 23 (2905) Brian G. Marsden
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