Central Bureau for Astronomical Telegrams
IAUC 2890: 1975o; 1975q; 1973 EA; NOTICE TO REGULAR SUBSCRIBERS
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Read IAUC 2891
Circular No. 2890
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
PERIODIC COMET GEHRELS 3 (1975o)
Further positions have been reported as follows:
1975 UT R. A. (1950) Decl. Observer
Nov. 30.04437 1 34 06.99 +10 30 02.5 Schwartz
Dec. 7.20903 1 32.32 +10 17.4 Roemer
7.23264 1 32.31 +10 17.4 "
8.15354 1 32 08.65 +10 16 03.1 Shao
G. Schwartz and C. Y. Shao (Harvard College Observatory, Agassiz
Station). 155-cm reflector. Measurer: Shao.
E. Roemer (Lunar and Planetary Laboratory). 154-cm reflector.
The following improved elements, by B. G. Marsden, satisfy the
ten available positions within 2":
T = 1977 Apr. 2.139 ET
Peri. = 228.807 e = 0.16925
Node = 243.080 1950.0 a = 4.09180 AU
Incl. = 1.076 n = 0.119078
q = 3.39927 AU P = 8.28 years
1976 ET R. A. (1950) Decl. Delta r m2
Jan. 3 1 33.50 +10 15.8 3.414 3.776 19.4
13 1 37.03 +10 33.3
23 1 42.08 +10 59.4 3.688 3.748 19.6
Feb. 2 1 48.48 +11 32.8
12 1 56.09 +12 12.4 3.955 3.721 19.7
22 2 04.76 +12 56.8
Mar. 3 2 14.37 +13 44.8 4.192 3.695 19.8
13 2 24.80 +14 35.3
23 2 35.93 +15 27.1 4.385 3.669 19.9
m2 = 11.0 + 5 log Delta + 10 log r
COMET SATO (1975q)
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. m1 Observer
Dec. 11.85515 12 19 24.5 + 2 47 39 Hiramatsu
11.85723 12 19 24.9 + 2 47 16 "
12.79583 12 20 19.20 - 0 57 21.5 Koishikawa
12.80382 12 20 20.09 - 0 59 23.8 8.5 Seki
12.80729 12 20 20.32 - 1 00 17.6 "
12.82535 12 20 21.07 - 1 04 52.5 Koishikawa
13.78646 12 21 24.66 - 5 21 21.0 "
13.82512 12 21 27.04 - 5 32 11.9 "
13.85191 12 21 29.2 - 5 39 50 Edamatsu
13.86065 12 21 29.4 - 5 42 15 "
15.79688 12 24 08.70 -15 46 39.1 Koishikawa
15.85313 12 24 13.44 -16 05 51.1 "
15.86597 12 24 14.94 -16 10 17.5 8.3 Seki
15.87153 12 24 15.46 -16 12 13.8 "
V. Hiramatsu (Hamakita, Shizuoka). 7.5-cm f/4 camera.
M. Koishikawa (Sendai Observatory, Ayashi Station).
T. Seki (Kochi Observatory, Geisei Station). The times of the Dec.
15 observations were changed by +5 min.
K. Edamatsu (Sendai Observatory). 7.1-cm f/5.6 camera.
Selected total visual magnitude estimates: Dec. 13.25 UT, 9.2
(G. M. Hurst, Northampton, England, 26-cm reflector); 14.55, 9.0
(D. Machholz, Concord, California, 25-cm reflector).
I. Hasegawa, Nara, Japan, has suggested the possibility of
observing meteors associated with the comet on 1976 Jan. 2 from the
radiant R.A. = 195o, Decl. = +47o; V_inf = 54 km/s, r_c - r_e = -0.03 AU.
Corrigendum. The observation on Dec. 13.23295 UT (IAUC 2884)
was made by M. R. Dykes, assisted by R. L. Waterfield.
1973 EA
Recovery observations of this Apollo object have been reported
as follows. The position is close to that predicted on IAUC 2816.
1975 UT R. A. (1950) Decl. Observer
Dec. 1.97201 20 49.6 -13 58 McCrosky
3.98266 20 57.5 -12 28 Schwartz
4.08333 20 57.78 -12 23.2 Roemer
4.11389 20 57.90 -12 21.8 "
R. E. McCrosky and G. Schwartz (Harvard College Observatory, Agassiz
Station). 155-cm reflector.
E. Roemer and M. A. Daniel (University of Arizona). Steward
Observatory's 229-cm reflector, Kitt Peak.
NOTICE TO REGULAR SUBSCRIBERS
We again advise regular subscribers to pay their bills promptly.
Because of the extremely large number of Circulars issued recently,
a subscription can in fact expire only one or two months,
rather than the anticipated four months, after the bill is prepared.
1975 December 29 (2890) Brian G. Marsden
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