Central Bureau for Astronomical Telegrams
IAUC 2964: 1975n; 1976e
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Read IAUC 2965
Circular No. 2964
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 WEST (1975n)
Further precise positions have been reported as follows:
1975/76 UT R. A. (1950) Decl. Observer
Nov. 7.49722 20 17 24.35 -40 55 10.5 Gans
10.51250 20 17 59.32 -40 39 54.8 Candy
13.50972 20 18 51.48 -40 24 19.9 Jekabsons
27.51944 20 26 32.49 -39 06 27.2 "
Dec. 10.55347 20 38 39.92 -37 46 09.4 "
28.55278 21 02 46.34 -35 36 14.9 Candy
Feb. 15.50417 22 59 36.39 -20 42 11.6 "
Apr. 3.33430 20 46 43.07 +13 55 29.3 Mourao
3.34461 20 46 41.88 +13 55 32.1 "
5.33845 20 44 25.11 +14 13 56.8 "
5.34399 20 44 24.68 +14 13 56.0 "
6.32949 20 43 16.82 +14 22 53.0 "
6.34195 20 43 15.93 +14 23 00.6 "
7.30495 20 42 08.77 +14 31 38.1 "
7.31360 20 42 08.21 +14 31 44.6 "
9.31229 20 39 45.52 +14 49 30.6 "
21.02338 20 24 20.61 +16 22 54.9 Dykes
26.02022 20 16 34.69 +16 56 51.5 Haddow
May 1.74372 20 06 37.52 +17 29 35.8 Gilmore
1.75071 20 06 36.74 +17 29 36.9 "
D. Gans, M. P. Candy and C. Jekabsons (Perth Observatory). The Feb.
15 position corrects that on IAUC 2928.
R. R. de F. Mourao (National Observatory, Rio de Janeiro). Probably
nucleus A on Apr. 3-7, nucleus B on Apr. 9.
M. R. Dykes and K. A. Haddow (Woolston Observatory). Measurer:
R. L. Waterfield. Essentially nucleus D.
A. C. Gilmore (Carter Obs.). Measurer; P. M. Kilmartin. Nucleus A.
Further photographic observations of the separations and position
angles of nuclei B and D (relative to nucleus A):
Nucleus B. May 1.75 UT, 41".3, 302o.1 (Gilmore); 22.40, 49".1, 296o.3
(S. Murrell and C. Knuckles, New Mexico State University; measured
by E. J. Reese); 26.40, 49".6, 296o.0 (Murrell); 29.24, 50".6,
294o.8 (G. Schwartz, Harvard Observatory, Agassiz Station; measured
by Z. Sekanina); June 1.40, 49".3, 295o.7 (Murrell).
Nucleus D. May 1.75 UT, 17".7, 311o.3 (Gilmore); 22.40, 21".9, 304o.7
(Murrell); 26.40, 22".1, 304o.7 (Murrell); 29.24, 22".5, 303o.8
(Schwartz); June 1.40, 22".5, 304o.3 (Murrell).
J. Bortle, Brooks Observatory, provides the following visual
magnitude estimates for the condensations (32-cm reflector): May
24.26 UT, A = 14.1, B = 14.7, D = 13.9; 28.27, 13.9, 14.8, 13.9;
June 5.27, 14.1, 14.7-14.8, 14.5. Total magnitude estimates and
tail information (10 x 50 binoculars): May 24.26, 7.2, 0o.6 in p.a.
268o; 28.27, 7.4, 0o.5 in 260o; June 5.27, 8.0, 0o.5 in 254o.
PERIODIC COMET D'ARREST (1976e)
The following precise positions have been reported:
1976 UT R. A. (1950) Decl. m2 Observer
Feb. 25.48368 16 24 07.28 - 3 05 15.8 ~21.5 Roemer
25.52338 16 24 10.87 - 3 05 05.6 "
Mar. 25.44230 17 08 06.54 + 0 07 52.7 ~20.6 "
25.48575 17 08 10.52 + 0 08 19.6 "
May 25.32014 18 22 42.97 +14 51 41.1 "
28.39595 18 25 38.12 +15 44 15.0 ~18.0 "
28.41817 18 25 39.26 +15 44 37.5 "
June 4.22037 18 31 58.18 +17 35 56.8 ~17.5 Schwartz
E. Roemer (University of Arizona). Steward Observatory's 229-cm
reflector on Feb. 25 and Mar. 25 (C. A. Heller assisting) and May
28 (L. M. Vaughn assisting; sharp, quite stellar nucleus with
barest trace of coma southward). Lunar and Planetary Laboratory's
154-cm reflector on May 25. Measurer: C. D. Vesely.
G. Schwartz (Harvard Observatory). 155-cm reflector. Measurer:
C. Y. Shao. Strong condensation with very small circular coma.
The following ephemeris positions are from a new orbit determined
by the undersigned from observations 1970-1976. For Delta, r
and magnitudes see IAUC 2900 and Sky Telescope (1976) 52, 10.
1976 ET R. A. (1950) Decl. 1976 ET R. A. (1950) Decl.
June 16 18 43.08 +20 20.2 Aug. 25 23 02.73 -29 53.9
21 18 48.20 +21 12.2 30 23 32.25 -34 31.3
26 18 53.83 +21 48.5 Sept. 4 23 56.87 -37 32.6
July 1 19 00.29 +22 04.6 9 0 16.50 -39 21.7
6 19 07.93 +21 55.0 14 0 31.63 -40 19.0
11 19 17.24 +21 12.5 19 0 42.97 -40 38.6
16 19 28.72 +19 47.3 24 0 51.32 -40 30.1
21 19 42.98 +17 25.8 29 0 57.42 -39 59.4
26 20 00.72 +13 50.8 Oct. 4 1 01.91 -39 11.3
31 20 22.64 + 8 43.5 9 1 05.29 -38 09.2
Aug. 5 20 49.18 + 1 53.3 14 1 07.93 -36 55.7
10 21 20.14 - 6 24.7 19 1 10.14 -35 32.9
15 21 54.29 -15 16.2 24 1 12.17 -34 02.5
20 22 29.38 -23 24.5 29 1 14.21 -32 26.0
1976 June 17 (2964) Brian G. Marsden
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