Central Bureau for Astronomical Telegrams
IAUC 2749: 1975a; Obs OF COMETS
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Read IAUC 2750
Circular No. 2749
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 BOETHIN (1975a)
The following positions have been reported:
1975 UT R. A. (1950) Decl. m1 Observer
Jan. 9.458 23 21 - 2 31 Boethin
10.469 23 25 08 - 1 59 "
14.469 23 41 04 + 0 05 12.0 "
16.458 23 49 + 1 19 "
29.469 0 43 34 + 8 37 "
Feb. 1.510 0 56 +10 16 "
2.469 1 00 42 +10 49 "
3.469 1 05 +11 20 "
4.472 1 09 14 +11 53 "
9.40417 1 30 54.26 +14 22 07.1 10.5 Urata
9.41007 1 30 55.66 +14 22 16.6 "
11.40209 1 39 41 +15 20 .7 "
11.68710 1 40 57.65 +15 29 05.1 12 Cristescu
11.70112 1 41 01.35 +15 29 34.9 "
13.40000 1 48 29.75 +16 17 35.8 11 Urata
13.40417 1 48 30.78 +16 17 42.9 "
15.0069 1 55 33 +17 03 11.2 Bortle
L. Boethln (Bangued, The Philippines). 20-cm reflector.
T. Urata (Nihondaira Observatory). 15-cm f/6 reflector. The time
of the first observation on IAUC 2748 should read Feb. 5.40422.
Cornelia Cristescu (Bucharest Observatory). Comet diffuse without
condensation.
J. E. Bortle (Brooks Observatory). 32-cm reflector.
The following sets of orbital elements, by the undersigned,
satisfy the accurate observations equally well. The elliptical
solution (2) is in closer agreement with the rough January positions.
It is still questionable whether the comet is a short-period
one, but solution (2) implies that the comet would have made
a close approach to Jupiter in 1969.
(1) (2)
T = 1975 Jan. 9.03 1975 Jan. 4.98 ET
Peri. = 15.20 10.42
Node = 24.30 27.89 1950.0
Incl. = 5.99 5.86
q = 1.142 1.0794 AU
e = 1.0 0.7123
1975 ET R. A. (1950) Decl. Delta r m1
(1) Feb. 27 2 48.29 +21 50.6 1.383 1.380 12.1
Mar. 4 3 09.83 +23 26.7
9 3 30.95 +24 48.4 1.495 1.471 12.5
14 3 51.55 +25 56.2
19 4 11.55 +26 50.8 1.630 1.569 13.0
24 4 30.87 +27 33.4
29 4 49.48 +28 05.0 1.784 1.673 13.5
Apr. 3 5 07.36 +28 26.8
8 5 24.50 +28 40.0 1.953 1.780 14.0
(2) Feb. 27 2 48.46 +21 51.5 1.269 1.299 12.2
Mar. 4 3 10.20 +23 28.4
9 3 31.60 +24 50.8 1.365 1.375 12.6
14 3 52.58 +25 59.3
19 4 13.05 +26 54.5 1.480 1.456 13.0
24 4 32.93 +27 37.3
29 4 52.16 +28 08.7 1.611 1.541 13.4
Apr. 3 5 10.73 +28 29.8
8 5 28.61 +28 41.7 1.755 1.629 13.8
OBSERVATIONS OF COMETS
Dr. G. R. Kastel', Institute for Theoretical Astronomy, Leningrad,
communicates the following precise positions of periodic
comets Schwassmann-Wachmann 1 and Forbes (1974a), obtained by T. M.
Smirnova, N. S. Chernykh, L. V. Zhuravleva and L. I. Chernykh at
the Crimean Astrophysical Observatorv. Measurer: Zhuravleva.
Reduced at I.T.A. The positions are the means of two measurements.
Comet 1974 UT R. A. (1950) Decl. Observer Note
P/S-W 1 Aug. 25.96038 23 25 26.59 + 2 39 16.8 Smirnova
Sept.14.92076 23 16 18.63 + 2 03 22.2 N. Chernykh 1
19.85821 23 14 00.15 + 1 52 37.3 "
20.87917 23 13 32.22 + 1 50 11.6 Zhuravleva
21.87168 23 13 04.66 + 1 48 09.0 N. Chernykh
22.88188 23 12 37.75 + 1 45 47.8 Zhuravleva
23.87482 23 12 10.66 + 1 43 37.1 N. Chernykh
Oct. 9.76525 23 05 43.51 + 1 08 43.2 "
1974a Sept.11.92380 23 30 22.25 - 9 29 22.1 L. Chernykh 2
14.86788 23 27 46.20 - 9 31 06.6 N. Chernykh
Oct. 9.77479 23 12 33.64 - 9 00 49.6 " 3
Notes. (1) Comet outside polygon of reference stars and very near
edge of plate; (2) near edge of plate; (3) very faint image.
1975 February 25 (2749) Brian G. Marsden
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