Central Bureau for Astronomical Telegrams
IAUC 3142: 1976 AA; 1977k; 1975 II; 1975 VIII
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Read IAUC 3143
Circular No. 3142
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 Telex: 921428
Telephone: (617) 864-5758
1976 AA
Precise position measured by C.-Y. Shao from an exposure by G.
Schwartz with the Harvard Observatory's 155-cm reflector:
1977 UT R. A. (1950) Decl.
Nov. 18.35936 10 21 49.49 + 3 39 35.8
Orbital elements, by B. G. Marsden, from 58 observations 1976
Jan. 7 to 1977 Nov. 18, perturbations by Mercury to Pluto included:
T = 1978 Apr. 14.1933 ET Epoch = 1978 Apr. 2.0 ET
Peri. = 147.8259 e = 0.182468
Node = 108.0687 1950.0 a = 0.966246 AU
Incl. = 18.9355 n = 1.037702
q = 0.789937 AU P = 0.950 year
1977/78 ET R. A. (1950) Decl. Delta r Mag.
Dec. 23 12 44.77 + 4 53.8 0.564 1.067 18.4
28 13 09.80 + 5 16.7
Jan. 2 13 35.96 + 5 40.9 0.529 1.042 18.3
7 14 03.12 + 6 05.1
12 14 31.06 + 6 27.6 0.508 1.014 18.2
17 14 59.51 + 6 46.7
22 15 28.17 + 7 00.6 0.502 0.984 18.2
27 15 56.76 + 7 07.9
Feb. 1 16 24.99 + 7 07.6 0.512 0.952 18.2
6 16 52.66 + 6 59.3
11 17 19.59 + 6 43.1 0.535 0.919 18.3
16 17 45.72 + 6 19.2
21 18 11.07 + 5 48.3 0.569 0.888 18.4
26 18 35.70 + 5 11.4
Mar. 3 18 59.71 + 4 29.8 0.611 0.858 18.5
8 19 23.21 + 3 44.8
13 19 46.31 + 2 57.8 0.659 0.831 18.6
18 20 09.12 + 2 10.2
23 20 31.75 + 1 23.7 0.712 0.810 18.7
28 20 54.27 + 0 39.7
Apr. 2 21 16.75 - 0 00.1 0.769 0.796 18.8
7 21 39.21 - 0 34.5
12 22 01.64 - 1 02.5 0.828 0.790 18.8
17 22 24.01 - 1 23.1
22 22 46.29 - 1 35.9 0.890 0.793 18.9
Mag. = 18.0 + 5 log Delta + 5 log r + 0.023 (phase angle)
PERIODIC COMET AREND-RIGAUX (1977k)
The following precise positions have been reported:
1977 UT R. A. (1950) Decl. m2 Observer
Aug. 19.27890 2 11 23.82 -10 37 00.6 19.2 Pereyra
19.32195 2 11 26.41 -10 37 23.5 "
20.23576 2 12 21.33 -10 45 10.0 19.2 "
20.27880 2 12 23.77 -10 45 31.2 "
21.32455 2 13 25.56 -10 54 42.0 19.1 "
21.36551 2 13 27.82 -10 55 03.9 "
22.29806 2 14 22.33 -11 03 25.9 19.1 "
22.34181 2 14 24.72 -11 03 49.0 "
Nov. 17.49155 2 12 51.8 -26 13 53 17 Allen
17.56801 2 12 49.0 -26 13 31 "
Z. M. Pereyra (Cordoba Observatory, Bosque Alegre Station). 154-cm
reflector. Measurer: B. Oviedo de Zarate. Stellar appearance.
D. Allen (Anglo-Australian Observatory). Positions from the encoders
on the 390-cm reflector (accuracy +/- 3"). Bright, stellar
nucleus, small halo, tail 15" long in p.a. 310o.
Allen adds that the comet's spectrum is dominantly reflected
sunlight, but very weak CN 3883 A emission is present. A spectrogram
(dispersion 200 A/mm, range 3200-7500 A) obtained by W. G.
Tifft and J. Degewij with the Steward Observatory's 229-cm reflector
on Nov. 4 also shows a very strong continuum (including solar
Ca II in absorption) over half the 20" length of the slit; weak CN
and C3 (but not C2) emission extends across the length of the slit.
COMET SCHUSTER (1975 II)
Precise positions measured by P. M. Kilmartin from exposures
by A. C. Gilmore at Mount John University Observatory:
1977 UT R. A. (1950) Decl. m2
June 16.35602 8 17 23.11 -41 17 14.8
18.30867 8 17 47.80 -41 12 30.4 18.9
COMET LOVAS (1975 VIII)
The following precise positions were measured by Shao and
J. H. Bulger from exposures by Schwartz and Shao with the 155-cm
reflector at Harvard Observatory's Agassiz Station:
1977 UT R. A. (1950) Decl.
Aug. 15.28325 1 08 19.90 + 7 13 15.6
Sept. 11.28937 0 58 01.11 + 7 22 36.1
1977 November 28 (3142) Brian G. Marsden
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