Central Bureau for Astronomical Telegrams
IAUC 3070: 1977g; 1977e; 1977 HA
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Read IAUC 3071
Circular No. 3070
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 Telex: 921428
Telephone: (617) 864-5758
PERIODIC COMET ASHBROOK-JACKSON (1977g)
Z. M. Pereyra, Cordoba Observatory, writes that this comet has
been recovered by H. Moyano and himself with the 154-cm reflector
at Bosque Alegre. The exposures are of very good quality, and the
comet is diffuse with central condensation. Measurer: B. Oviedo de
Zarate. The position is in good agreement with the predictions by
R. Luss (IAUC 3021) and E. I. Kazimirchak-Polonskaya (IAUC 3045).
1977 UT R. A. (1950) Decl. m2
Apr. 28.32625 16 15 46.76 -35 35 13.6 19.5
28.36929 16 15 45.07 -35 35 17.8
COMET HELIN (1977e)
Further precise positions have been reported as follows:
1977 UT R. A. (1950) Decl. m1 Observer
Apr. 20.61875 12 22 07.42 - 9 36 31.0 15.5 Seki
20.64583 12 21 59.96 - 9 37 47.4 "
21.55451 12 18 08.73 -10 17 41.6 Koishikawa
21.63438 12 17 48.03 -10 21 05.9 "
22.27604 12 15 01.34 -10 49 47.4 Giclas
22.45137 12 14 15.66 -10 57 19.0 Gilmore
22.49859 12 14 03.03 -10 59 31.9 "
22.65139 12 13 23.36 -11 06 29.2 16 Seki
23.41106 12 10 04.16 -11 40 36.2 Gilmore
25.35972 12 01 22.42 -13 09 56.9 14.1 "
25.37917 12 01 16.99 -13 10 52.0 "
T. Seki (Kochi Observatory, Geisei Station).
M. Koishikawa (Sendai Observatory, Ayashi Station). 20-cm f/5.5
reflector. From Japan Astron. Circ. No. 96.
H. L. Giclas (Lowell Observatory). Measurer: M. L. Kantz.
A. C. Gilmore (Carter Observatory). Measurer: P. M. Kilmartin. 41-cm
reflector. 20- and 30-min exposures in good conditions on
Apr. 25 showed a fine condensation and 40" tail in p.a. 80o.
The following improved parabolic orbit, by B. G. Marsden,
satisfies 21 observations Apr. 16-25 within 3". It now seems unlikely
that the comet can be a short-period one.
T = 1977 June 30.977 ET Peri. = 249.357
Node = 19.443 1950.0
q = 1.11752 AU Incl. = 43.191
1977 ET R. A. (1950) Decl. Delta r m1
May 7 11 07.40 -22 13.0 0.563 1.419 14.3
12 10 44.75 -25 50.9
17 10 23.35 -29 11.2 0.585 1.330 14.1
22 10 03.55 -32 13.1
27 9 45.44 -34 58.0 0.627 1.252 14.0
June 1 9 28.91 -37 28.7
6 9 13.75 -39 47.7 0.677 1.188 13.9
11 8 59.70 -41 57.4
16 8 46.52 -43 59.9 0.724 1.144 13.9
21 8 33.91 -45 56.9
26 8 21.62 -47 49.8 0.765 1.120 13.9
July 1 8 09.39 -49 39.7
6 7 57.00 -51 27.4 0.794 1.121 14.0
11 7 44.20 -53 14.2
16 7 30.72 -55 01.2 0.812 1.144 14.1
21 7 16.15 -56 49.4
26 7 00.00 -58 39.4 0.820 1.189 14.3
m1 = 14.0 + 5 log Delta + 10 log r
1977 HA
The following improved orbital elements, by B. G. Marsden, are
from ten observations Apr. 17-25:
T = 1977 Feb. 13.310 ET
Peri. = 290.498 e = 0.50202
Node = 190.878 1950.0 a = 1.59632 AU
Incl. = 22.978 n = 0.488681
q = 0.79493 AU P = 2.02 years
1977 ET R. A. (1950) Decl. Delta r B
May 17 13 40.93 +29 28.0 0.501 1.359 19.2
22 13 44.94 +28 12.3
27 13 49.03 +26 54.2 0.623 1.435 19.8
June 1 13 53.25 +25 34.4
6 13 57.65 +24 13.5 0.750 1.508 20.3
11 14 02.23 +22 51.9
16 14 07.03 +21 30.0 0.882 1.578 20.8
21 14 12.06 +20 08.2
26 14 17.31 +18 46.9 1.019 1.646 21.2
July 1 14 22.78 +17 26.5
6 14 28.46 +16 07.1 1.160 1.711 21.5
11 14 34.33 +14 49.0
16 14 40.40 +13 32.2 1.305 1.772 21.8
B = 19.2 + 5 log Delta + 5 log r + 0.023 (phase angle)
1977 May 10 (3070) Brian G. Marsden
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