Central Bureau for Astronomical Telegrams
IAUC 2244: 1970e; P/ENCKE
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Circular No. 2244
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 ASHBROOK-JACKSON (1970e)
Mr. Z. M. Pereyra, Cordoba Observatory for the CNEGH,
communicates the following semi-accurate positions, measured from his
plates by Miss B. Oviedo. The comet has a tail 15" long. The
March 9 magnitude has been revised to 19.5.
1970 UT R. A. (1950) Decl. Mag.
May 1.36869 19 02.40 -38 10.1 18.5
2.28883 19 02.75 -38 14.3
3.32837 19 03.11 -38 19.1
PERIODIC COMET ENCKE
The following results, by B. G. Marsden, are from an orbit
satisfying observations 1927-1967, including the effects of
nongravitational forces and perturbations by all nine planets. A
very similar ephemeris, corresponding to T = 1971 Jan. 9.9583 ET,
by N. A. Bohan, appears in Kiev. Komet. Cirk. No. 81.
T = 1971 Jan. 9.9820 ET Epoch = 1971 Jan. 9.0 ET
Peri. = 185.9432 e = 0.847162
Node = 334.2185 1950.0 a = 2.217325 AU
Incl. = 11.9740 n = 0.2985107
q = 0.338891 AU P = 3.302 years
1970/71 ET R. A. (1950) Decl. Delta r Mag.
June 23 1 19.88 +14 22.7 2.983 2.752 20.5
July 3 1 29.19 +15 45.5
13 1 37.93 +17 08.9 2.550 2.594 19.7
23 1 45.91 +18 33.1
Aug. 2 1 52.86 +19 58.4 2.103 2.423 18.9
12 1 58.40 +21 25.4
22 2 02.00 +22 54.7 1.659 2.238 17.8
Sept. 1 2 02.94 +24 26.7
11 2 00.09 +26 01.1 1.242 2.035 16.6
21 1 51.95 +27 36.3
Oct. 1 1 36.31 +29 05.2 0.879 1.812 15.1
11 1 10.45 +30 10.7
21 0 32.11 +30 18.2 0.607 1.566 13.3
26 0 08.22 +29 43.8
31 23 41.85 +28 35.4 0.517 1.432 12.4
Nov. 5 23 13.96 +26 49.6
10 22 45.69 +24 27.7 0.461 1.290 11.5
15 22 18.01 +21 35.3
20 21 51.54 +18 20.4 0.433 1.139 10.5
25 21 26.44 +14 50.6
30 21 02.41 +11 11.0 0.425 0.978 9.5
Dec. 5 20 38.79 + 7 22.5
10 20 14.65 + 3 22.1 0.429 0.805 8.3
15 19 49.08 - 0 55.5
20 19 21.61 - 5 33.5 0.456 0.623 6.7
25 18 52.82 -10 27.3
30 18 25.48 -15 20.4 0.550 0.446 4.9
Jan 4 18 05.15 -19 47.3
9 17 58.70 -23 22.7 0.785 0.340 3.9
14 18 08.21 -25 49.6
19 18 27.68 -27 09.1 1.099 0.415 6.0
24 18 50.14 -27 38.6
29 19 12.13 -27 36.1 1.356 0.587 8.7
Feb. 3 19 32.54 -27 14.0
8 19 51.15 -26 40.2 1.556 0.770 10.8
13 20 08.07 -25 59.3
18 20 23.46 -25 14.3 1.715 0.945 12.3
23 20 37.52 -24 27.2
28 20 50.40 -23 39.3 1.842 1.108 13.5
Mar. 5 21 02.24 -22 51.6
10 21 13.15 -22 04.7 1.941 1.261 14.5
15 21 23.23 -21 18.9
20 21 32.56 -20 34 7 2.014 1.405 15.2
25 21 41.19 -19 52.3
30 21 49.19 -19 12.0 2.063 1.540 15.9
Apr. 9 22 03.35 -17 58.3
19 22 15.25 -16 54.9 2.095 1.789 16.9
29 22 24.93 -16 03.2
May 9 22 32.33 -15 24.7 2.053 2.014 17.6
19 22 37.34 -15 00.5
29 22 39.73 -14 52.2 1.959 2.219 18.2
June 8 22 39.25 -15 01.1
18 22 35.65 -15 27.4 1.847 2.406 18.6
28 22 28.72 -16 10.6
July 8 22 18.47 -17 07.9 1.763 2.578 18.9
18 22 05.27 -18 14.1
28 21 49.87 -19 21.9 1.760 2.737 19.3
Aug. 7 21 33.49 -20 23.6
17 21 17.53 -21 12.8 1.880 2.883 19.8
27 21 03.26 -21 46.7
Sept. 6 20 51.62 -22 05.1 2.126 3.019 20.3
Mag. = 11.5 + 5 log Delta + 15 log r
1970 May 20 (2244) Brian G. Marsden
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