Central Bureau for Astronomical Telegrams
IAUC 2903: 1975 YA; 1976 AA; 1975k; P/PONS-WINNECKE
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Read IAUC 2904
Circular No. 2903
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
1975 YA
Further precise positions have been reported as follows:
1975/76 UT R. A. (1950) Decl. Observer
Dec. 28.28542 4 27 07.60 +79 15 00.8 Kowal
28.29028 4 25 54.58 +79 17 01.8 "
29.11319 0 37 39.04 +79 44 17.2 "
29.11806 0 36 41.09 +79 43 02.8 "
30.10833 22 42 43.74 +74 11 16.2 "
30.11528 22 42 18.64 +74 08 59.5 "
Jan. 2.10365 21 36 14.96 +62 39 50.2 "
2.11198 21 36 11.02 +62 38 38.9 "
3.11528 21 29 34.49 +60 25 24.1 "
3.12361 21 29 31.64 +60 24 26.8 "
9.02257 21 13 59.81 +53 31 41.2 McCrosky
9.99094 21 12 49.90 +52 53 51.1 "
11.01325 21 11 46.20 +52 18 29.5 Shao
C. Kowal (Hale Observatories). 46-cm Schmidt telescope on Dec. 28-30,
122-cm on Jan. 2-3. Beginnings and ends of trails. Times
uncertain on Dec. 28; beginning time uncertain on Jan. 3.
R. E. McCrosky, G. Schwartz and C. Y. Shao (Harvard College Observatory,
Agassiz Station). 155-cm reflector. Measurer: Shao.
The precise positions show that the orbital elements and
conclusions on IAUC 2897 are incorrect. The following improved
elements, by B. G. Marsden, show that the object is a member of the
Apollo group having very high orbital inclination:
T = 1976 Feb. 14.46 ET
Peri. = 61.06 e = 0.3015
Node = 93.74 1950.0 a = 1.2981 AU
Incl. = 64.17 n = 0.66639
q = 0.9067 AU P = 1.48 years
1976 ET R. A. (1950) Decl. Delta r Mag.
Jan. 13 21 10.07 +51 20.7 0.341 0.960 17.0
18 21 07.07 +49 34.2
23 21 05.04 +48 18.0 0.518 0.933 17.8
28 21 03.51 +47 16.3
Feb. 2 21 02.32 +46 21.9 0.679 0.915 18.2
7 21 01.38 +45 30.7
12 21 00.67 +44 40.6 0.819 0.907 18.5
17 21 00.19 +43 50.3
22 20 59.96 +42 59.4 0.930 0.910 18.6
27 20 59.99 +42 07.8
Mar. 3 21 00.27 +41 15.4 1.012 0.923 18.8
8 21 00.75 +40 22.5
13 21 01.43 +39 28.8 1.060 0.946 18.9
Mag. = 17.5 + 5 log Delta + 5 log r + 0.023 (phase angle)
1976 AA
H. L. Giclas, Lowell Observatory, provides the following precise
position, obtained with the 33-cm photographic telescope.
Measurer: M. L. Kantz.
1976 UT R. A. (1950) Decl.
Jan. 11.23438 6 31 51.89 +24 08 45.2
This observation confirms the orbital elements and conclusions
on IAUC 2901, except that the object now seems to be unique in
having a mean distance of less than 1 AU.
COMET SUZUKI-SAIGUSA-MORI (1975k)
The following precise positions have been reported:
1975 UT R. A. (1950) Decl. Observer
Oct. 10.76910 11 15 33.61 +43 15 18.4 Suzuki
Nov. 3.75382 18 00 59.03 -51 05 12.4 Hers
K. Suzuki (JCPM Oi Station). From Nihondaira Obs. Circ. No. 718.
J. Hers (Randburg, near Johannesburg). 20-cm reflector.
Selected total visual magnitude estimates: 1975 Nov. 6.76 UT,
5.5 (J. G. Caburian, Manila, Philippines, 7 x 50 binoculars); 30.42,
9.1 (M. Stewart, Raumati Beach, New Zealand, 10-cm reflector, 36 x).
PERIODIC COMET PONS-WINNECKE
N. A. Belyaev, Institute for Theoretical Astronomy, Leningrad,
communicates the following predicted elements by E. A. Reznikov,
Kazan University, based on observations at the 1964 and 1970
returns. The ephemeris is very similar to that on IAUC 2880.
T = 1976 Nov. 28.7383 ET Epoch = 1976 Oct. 28.0 ET
Peri. = 172.36030 e = 0.6347303
Node = 92.74536 1950.0 a = 3.4335961 AU
Incl. = 22.29408 n = 0.1549103
q = 1.2541885 AU P = 6.362 years
1976 January 16 (2903) Brian G. Marsden
Read IAUC 2904
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