Central Bureau for Astronomical Telegrams
IAUC 3012: 1936 CA (ADONIS); 1976 UA; 1975n
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Circular No. 3012
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
1936 CA (ADONIS)
The following prediction, by B. G. Marsden, is based on 24
observations 1936 Feb. 12 to Apr. 11, perturbations by all nine
planets being taken into account. The search ephemerides cover the
anticipated uncertainty in T (see also Minor Planet Circ. No. 4012).
If Delta-T = +12d there will be (as in l936) a very close approach to
the earth on Feb. 8.
T = 1976 Dec. 12.9484 ET Epoch = 1977 Jan. 17.0 ET
Peri. = 40.4234 e = 0.764162
Node = 351.8333 1950.0 a = 1.872618 AU
Incl. = 1.3609 n = 0.3846186
q = 0.441635 AU P = 2.563 years
(1950) R.A. Decl. mpg R.A. Decl. mpg R.A. Decl. mpg
1977 ET Delta-T = -16 d Delta-T = -12 d Delta-T = -8 d
Jan. 17 13 53 -10.0 20 14 10 -11.2 20 14 37 -13.0 20
22 13 39 - 8.8 13 50 - 9.5 14 09 -10.8
27 13 24 - 7.5 20 13 30 - 7.8 20 13 42 - 8.4 19
Feb. 1 13 08 - 6.0 13 10 - 5.9 13 15 - 6.0
6 12 51 - 4.3 20 12 49 - 3.9 20 12 48 - 3.4 19
11 12 33 - 2.6 12 28 - 1.8 12 22 - 0.9
16 12 15 - 0.8 20 12 08 + 0.2 20 11 58 + 1.5 19
21 11 58 + 1.0 11 48 + 2.2 11 36 + 3.7
26 11 41 + 2.7 20 11 30 + 4.0 20 11 16 + 5.6 20
Mar. 3 11 25 + 4.2 11 13 + 5.5 11 00 + 7.1
8 11 11 + 5.5 20 11 00 + 6.9 20 10 46 + 8.4 20
1977 ET Delta-T = -4 d Delta-T = 0 d Delta-T = +4 d
Jan. 27 14 03 - 9.7 19 14 44 -11.9 18 16 13 -15.7 18
Feb. 1 13 24 - 6.2 13 44 - 7.0 14 34 - 9.1
6 12 48 - 2.8 19 12 50 - 2.1 18 12 58 - 0.9 17
11 12 15 + 0.4 12 05 + 2.2 11 48 + 5.3
16 11 46 + 3.2 19 11 29 + 5.6 18 11 02 + 9.1 18
21 11 21 + 5.6 11 01 + 8.0 10 32 +11.4
26 11 00 + 7.5 19 10 39 + 9.8 19 10 12 +12.7 18
Mar. 3 10 43 + 8.9 10 23 +11.1 9 59 +13.5
8 10 30 +10.0 20 10 12 +11.9 20 9 50 +14.0 20
1977 ET Delta-T = +8 d Delta-T = +12 d Delta-T = +16 d
Feb. 6 13 38 + 2.3 16 (21 34 +10.3 16) 23 28 + 4.0 18
11 11 12 +12.4 8 12 +36.2 2 08 +23.0
16 10 16 +15.0 16 8 37 +24.6 16 5 33 +29.9 17
21 9 50 +15.9 8 43 +21.7 7 03 +26.6
26 9 36 +16.2 18 8 47 +20.3 18 7 41 +24.0 18
Mar. 3 9 28 +16.3 8 50 +19.4 8 03 +22.3
8 9 24 +16.3 19 8 53 +18.7 19 8 17 +21.1 19
13 9 22 +16.2 8 56 +18.2 8 27 +20.2
18 9 21 +16.1 20 9 00 +17.7 20 8 36 +19.4 20
1976 UA
Further precise positions have been reported as follows:
1976 UT R. A. (1950) Decl. Observer
Oct. 28.10184 0 09 40.54 - 1 52 12.5 West
28.10877 0 09 41.06 - 1 52 34.0 "
28.31944 0 10 03.33 - 2 05 54.4 Roemer
28.33750 0 10 04.95 - 2 06 47.9 "
29.23763 0 11 47.66 - 2 44 13.9 West
29.24594 0 11 48.24 - 2 44 32.7 "
29.36204 0 12 08.71 - 2 48 54.0 Gilmore
29.40512 0 12 12.04 - 2 50 28.9 "
30.18018 0 13 20.78 - 3 17 26.9 West
30.20598 0 13 22.16 - 3 18 13.8 "
30.32431 0 13 32.50 - 3 23 51.0 Roemer
30.34792 0 13 33.94 - 3 24 32.3 "
31.07219 0 14 39.58 - 3 42 49.5 West
31.07911 0 14 39.93 - 3 42 58.1 "
Nov. 1.09854 0 15 53.99 - 4 06 24.9 "
1.10408 0 15 54.18 - 4 06 32.0 "
11.04977 0 24 35.20 - 5 31 48.0 Schuster
12.02419 0 25 20.68 - 5 33 03.0 "
R. M. West and H.-E. Schuster (European Southern Observatory).
E. Roemer (Lunar and Planetary Laboratory). Measurer: C. D. Vesely.
Image elongated on first Oct. 28 exposure. 154-cm reflector.
A. C. Gilmore and P. M. Kilmartin (Carter Observatory).
COMET WEST (1975n)
The following positions of nucleus A have been measured by
C. Y. Shao from exposures by G. Schwartz with the 155-cm reflector
at Harvard Observatory's Agassiz Station. The separation and position
angle of nucleus B (relative to A) were: May 29, 50".7, 295o;
Sept. 25, 33".2, 334o. Those of nucleus D (also relative to A) were:
May 29, 22".8, 304o; Sept. 25, 17".6, 338o.
1976 UT R. A. (1950) Decl.
May 29.23861 19 04 45.52 +17 36 46.0
Sept.25.02014 17 24 48.36 - 4 38 32.0
1976 December 1 (3012) Brian G. Marsden
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