Central Bureau for Astronomical Telegrams
IAUC 2988: 1975n
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Read IAUC 2989
Circular No. 2988
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 (of nucleus A) follow:
1976 UT R. A. (1950) Decl. m1 Observer
Apr. 1.13545 20 49 13.76 +13 34 23.5 4.5 Mrkos
1.13684 20 49 13.72 +13 34 24.8 "
2.13817 20 48 04.95 +13 43 58.8 4.7 "
2.13881 20 48 04.91 +13 43 59.5 "
3.13154 20 46 56.82 +13 53 20.6 4.9 "
3.13223 20 46 56.76 +13 53 21.1 "
4.12950 20 45 48.48 +14 02 39.4 5.0 "
4.13014 20 45 48.41 +14 02 40.3 "
10.04296 20 38 54.26 +14 55 34.3 Raudsaar
12.04236 20 36 27.70 +15 12 33.4 "
20.03542 20 25 47.81 +16 15 39.6 "
21.00972 20 24 22.23 +16 22 49.4 "
28.01667 20 13 14.38 +17 09 07.0 "
May 2.08574 20 05 59.86 +17 31 04.0 6.3 Mrkos
2.08782 20 05 59.65 +17 31 07.5 "
3.06749 20 04 09.60 +17 35 49.0 6.4 "
3.06940 20 04 09.37 +17 35 50.0 "
5+07124 20 00 18.12 +17 44 36.5 6.5 "
5.07332 20 00 17.90 +17 44 37.4 "
6.06789 19 58 19.91 +17 48 32.1 6.6 "
6.06998 19 58 19.67 +17 48 32.7 "
7.07475 19 56 18.31 +17 52 11.6 6.8 "
7.07743 19 56 18.02 +17 52 12.3 "
7.77587 19 54 52.29 *17 54 35.6 Furuta
8.07112 19 54 15.95 +17 55 31.5 6.8 Mrkos
8.07459 19 54 15.50 +17 55 31.5 "
8.77786 19 52 47.80 +17 57 40.1 Furuta
9.06405 19 52 12.22 +17 58 28.5 7.0 Mrkos
9.06683 19 52 11.60 +17 58 31.4 "
24.95134 19 15 26.92 +17 55 41.1 7.2 "
24.95620 19 15 26.17 +17 55 42.1 "
28.95362 19 05 28.38 +17 38 14.2 7.4 "
28.95825 19 05 27.64 +17 38 15.1 "
29.95263 19 02 58.24 +17 32 46.5 7.5 "
29.95946 19 02 57.17 +17 32 49.0 "
June 20.92394 18 11 07.38 +13 55 45.7 8.0 "
20.93296 18 11 06.32 +13 55 40.0 "
21.96152 18 08 59.11 +13 42 00.4 8.0 "
21.97054 18 08 57.80 +13 41 55.5 "
22.91759 18 07 03.13 +13 29 07.7 8.2 "
22.92679 18 07 02.09 +13 29 04.7 "
24.94310 18 03 04.40 +13 01 19.0 8.4 "
24.95051 18 03 03.29 +13 01 12.5 "
25.93472 18 01 11.04 +12 47 26.0 8.6 "
25.94352 18 01 09.98 +12 47 19.6 "
26.94541 17 59 17.70 +12 33 13.4 8.8 "
26.95281 17 59 16.91 +12 33 07.2 "
30.00160 17 53 50.18 +11 49 25.8 10.0 Haddow
30.93639 17 52 14.85 +11 35 52.3 8.9 Mrkos
30.94715 17 52 13.41 +11 35 39.6 "
July 1.90961 17 50 37.43 +11 21 38.8 9.0 "
1.92049 17 50 36.76 +11 21 29.0 "
26.51991 17 22 24.29 + 5 26 43.6 Urata
30.90040 17 19 43.04 + 4 28 19.8 12.8 Mrkos
30.91140 17 19 42.75 + 4 28 09.9 "
Aug. 19.20556 17 14 27.99 + 0 38 18.8 Giclas
26.06273 17 14 43.05 - 0 32 16.3 McCrosky
27.17500 17 14 50.98 - 0 43 20.0 Giclas
A. Mrkos (Klet Observatory).
H. K. Raudsaar (Tartu Observatory). Reduced at I.T.A., Leningrad.
T. Furuta (Tokai). From Orient. Astron. Assoc. Comet Bull. No. 131.
K. A. Haddow and R. L. Waterfield (Woolston Observatory). Very
condensed coma, diameter 2'.5; fan tail 45' long in p.a. 270o-300o.
T. Urata (JCPM Yakiimo Station). From Nihondaira Obs. Circ. No. 793.
H. L. Giclas (Lowell Observatory). Measurer: M. L. Kantz.
R. E. McCrosky (Harvard College Observatory, Agassiz Station). 155-cm
reflector. Measurer: Z. Sekanina.
Further photographic observations of the separations and position
angles of nuclei B and D (relative to nucleus A):
Nucleus B. Apr. 3.13 UT, 21".1, 318o (Mrkos); May 24.95, 50".5, 296o
(Mrkos); June 24.95, 39".7, 305o (Mrkos); July 30.91, 32".8, 321o
(Mrkos); Aug. 19.21, 38".4, 327o (Giclas); 26.06, 32".6, 329o
(McCrosky); 27.18, 40".6, 326o (Giclas).
Nucleus D. Apr. 3.13 UT, 9".5, 324o (Mrkos); 4.13, 10".2, 318o
(Mrkos); May 2.09, 18".4, 307o (Mrkos); 3.07, 19".2, 318o (Mrkos);
5.07, 18".2, 311o (Mrkos); 6.07, 19".4, 307o (Mrkos); 7.08, 19".5,
310o (Mrkos); 7.78, 18".8, 311o (Furuta); 8.07, 19".1, 306o
(Mrkos); 8.78, 20".7, 314o (Furuta); 9.07, 19".0, 304o (Mrkos);
24.95, 22".7, 301o (Mrkos); 28.96, 22".4, 300o (Mrkos); 29.96,
22".0, 302o (Mrkos); June 24.95, 18".6, 311o (Mrkos); July 26.52,
17".3, 319o (Urata); 30.91, 17".2, 318o (Mrkos); Aug. 26.06, 17".1,
324o (McCrosky).
J. Bortle, Brooks Observatory, provides the following total
visual magnitude estimates (32-cm reflector): July 23.10 UT, 9.3;
27.10, 9.5; Aug. 3.17, 9.9; 17.12, 10.4; 19.08, 10.6; 25.09, 11.0.
1976 September 23 (2988) Brian G. Marsden
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