Central Bureau for Astronomical Telegrams
IAUC 2206: 1970a; 1970b
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Read IAUC 2207
Circular No. 2206
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 DAIDO-FUJIKAWA (1970a)
The following precise positions have been reported:
1970 UT R.A. (1950) Decl. Mag. Observer
Jan. 27.86979 18 58 54.41 + 5 51 02.9 8 Honda
28.85104 19 03 16.69 + 5 09 20.1 8.2 Seki
28.85694 19 03 18.21 + 5 09 04.6 "
28.86042 19 03 19.38 + 5 08 52.7 "
Feb. 2.84936 19 29 10.54 + 0 53 06.1 6 Tomita
2.85006 19 29 10.63 + 0 53 03.8 "
2.85074 19 29 11.01 + 0 53 00.1 "
4.21286 19 37 34.77 - 0 31 44.0 7 Milet
4.21804 19 37 36.84 - 0 32 04.6 "
M. Honda (Kurashiki Observatory). Measurer: H. Kosai. Communicated
by H. Hirose, Tokyo. Comet diffuse with condensation.
T. Seki (Kochi Observatory). Tail 20' long in p.a. 330o.
K. Tomita (Tokyo Astronomical Observatory). Communicated by
H. Hirose. Comet diffuse with condensation, tail < 1o.
B. Milet (Nice Observatory). Diffuse with condensation, tail < 1o.
An observation by M. Mattei, Harvard, Massachusetts, on
February 5.44 gives a magnitude of 5.5 (7 x 50 binoculars).
The elements below, by the undersigned, are based on the
Japanese observations of January 28 and February 2 and Milet's
observations of February 4, no residual being larger than 3". The
orbit is rather similar to that of comet 1577. In the ephemeris
the column headed psi gives the elongation from the sun.
T = 1970 Feb. 15.806 ET Peri. = 266.687
Node = 29.996 1950.0
q = 0.06574 AU Incl. = 100.126
1970 TT R. A. (1950) Decl. Delta r psi Mag.
Feb. 6.0 19 49.81 - 2 35.5 1.057 0.448 25.0 5.1
6.5 19 53.52 - 3 12.9
7.0 19 57.37 - 3 51.4 1.036 0.414 23.4 4.7
7.5 20 01.38 - 4 31.4
8.0 20 05.55 - 5 12.8 1.016 0.378 21.7 4.3
8.5 20 09.91 - 5 55.7
9.0 20 14.48 - 6 40.1 0.997 0.342 19.8 3.8
9.5 20 19.26 - 7 26.1
10.0 20 24.29 - 8 13.6 0.980 0.303 17.7 3.3
10.5 20 29.60 - 9 02.8
11.0 20 35.22 - 9 53.5 0.965 0.263 15.4 2.6
11.5 20 41.20 -10 45.8
12.0 20 47.58 -11 39.5 0.952 0.221 12.9 1.8
12.5 20 54.44 -12 34.3
13.0 21 01.87 -13 29.7 0.944 0.176 10.2 +0.8
13.5 21 10.00 -14 24.8
14.0 21 18.98 -15 17.8 0.942 0.130 7.2 -0.5
14.5 21 29.04 -16 04.8
15.0 21 40.39 -16 37.5 0.953 0.084 4.5 -2.3
15.5 21 52.84 -16 38.5
16.0 22 04.81 -15 47.3 0.986 0.067 3.9 -3.3
16.5 22 14.08 -14 13.3
17.0 22 20.58 -12 26.5 1.030 0.101 5.2 -1.4
17.5 22 25.27 -10 42.3
18.0 22 28.89 - 9 04.5 1.068 0.148 6.9 +0.3
18.5 22 31.82 - 7 33.3
19.0 22 34.29 - 6 08.2 1.102 0.194 8.7 1.6
19.5 22 36.43 - 4 48.4
20.0 22 38.34 - 3 33.3 1.132 0.238 10.3 2.5
Mag. = 8.5 + 5 log Delta + 10 log r
The following table gives the offsets dR.A. and dDelta of the
comet from the sun. The comet will pass about 10' northwest of
Venus on Feb. 17.27 UT.
Feb. dR.A. dDecl. Feb. dR.A. dDecl. Feb. dR.A. dDecl.
13.0 -41m8 + 10' 15.5 - 0.6 -230 18.0 +25.7 +173
13.5 -35.6 - 55 16.0 + 9.4 -189 18.5 +26.8 +253
14.0 -28.6 -118 16.5 +16.7 -105 19.0 +27.3 +328
14.5 -20.5 -175 17.0 +21.3 - 9 19.5 +27.5 +397
15.0 -11.1 -218 17.5 +24.0 + 85 20.0 +27.5 +461
PERIODIC COMET PONS-WINNECKE (1970b)
Dr. Elizabeth Roemer, Lunar and Planetary Laboratory, telegraphs
that she has recovered this comet using the Steward Observatory's
229-cm reflector at Kitt Peak. The comet is of stellar appearance.
The position and magnitude are in close agreement with the
prediction on IAUC 2185.
1970 UT R.A. (1950) Decl. Mag.
Feb. 3.48657 13 28.0 +24 39 19
1970 February 6 (2206) Brian G. Marsden
Read IAUC 2207
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