Central Bureau for Astronomical Telegrams
IAUC 3111: 1977l; 1977 RA
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Read IAUC 3112
Circular No. 3111
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 CHERNYKH (1977l)
The following precise positions have been reported:
1977 UT R. A. (1950) Decl. m1 Observer
Sept. 6.67951 0 16 28.62 - 4 28 18.3 Kojima
6.69722 0 16 28.10 - 4 28 23.1 "
7.68229 0 16 06.17 - 4 33 23.3 Candy
9.70912 0 15 19.02 - 4 43 58.2 Jekabsons
11.56597 0 14 32.86 - 4 53 53.6 13 Seki
11.60972 0 14 31.74 - 4 54 02.3 Candy
11.79618 0 14 26.76 - 4 55 07.1 Seki
12.76250 0 14 01.54 - 5 00 12.6 Jekabsons
13.46875 0 13 42.66 - 5 04 06.6 Bus
13.68056 0 13 37.24 - 5 05 08.6 Candy
15.34653 0 12 51.61 - 5 14 14.4 Bus
18.26181 0 11 28.42 - 5 30 05.1 Giclas
19.35417 0 10 56.08 - 5 36 00.0 "
N. Kojima (Ishiki) and T. Seki (Geisei). Measurer: Seki.
M. P. Candy and P. Jekabsons (Perth Observatory, Bickley).
S. J. Bus and T. Lauer (Palomar Observatory). Measurer: J. Gibson.
H. L. Giclas (Lowell Observatory). Measurer: M. L. Kantz.
The following orbital elements have been calculated, the
ephemeris being from the second set:
M. P. Candy B. G. Marsden
(3 obs. Aug. 24-Sept. 13) (30 obs. Aug. 19-Sept. 19)
T = 1978 Feb. 14.1104 1978 Feb. 13.9958 ET
Peri. = 266.2430 266.4468
Node = 134.1828 134.0826 1950.0
Incl. = 5.7370 5.7218
q = 2.576309 2.570017 AU
e = 0.592015 0.592221
a = 6.314714 6.302483 AU
n = 0.0621117 0.0622926
P = 15.87 15.82 years
1977 ET R. A. (1950) Decl. Delta r m1
Sept.24 0 08.60 - 6 00.7
Oct. 4 0 03.44 - 6 50.2 1.808 2.790 12.7
14 23 58.78 - 7 29.7
24 23 55.37 - 7 54.5 1.856 2.731 12.7
Nov. 3 23 53.76 - 8 01.9
13 23 54.28 - 7 51.2 1.986 2.681 12.8
23 23 57.06 - 7 22.9
Dec. 3 0 02.05 - 6 38.4 2.171 2.639 12.9
13 0 09.08 - 5 39.8
23 0 17.95 - 4 28.9 2.386 2.607 13.0
m1 = 7.0 + 5 log Delta + 10 log r
1977 RA
Further precise positions have been reported as follows:
1977 UT R. A. (1950) Decl. Observer
Sept. 13.28125 22 56 44.38 +17 22 18.4 Bus
15.40903 22 58 01.84 +17 31 03.5 "
16.33160 22 58 37.38 +17 33 49.9 Giclas
19.26389 23 00 32.29 +17 39 01.1 "
S. J. Bus and T. Lauer (Palomar Mountain Observatory). 46-cm
Schmidt telescope. Measurers: Bus and J. Gibson.
H. L. Giclas (Lowell Observatory). Measurer: M. L. Kantz.
The following improved orbital elements, by the undersigned,
satisfy the seven precise positions within 1":
T = 1977 Aug. 18.5410 ET
Peri. = 41.6994 e = 0.411586
Node = 287.3317 1950.0 a = 2.104511 AU
Incl. = 5.2617 n = 0.3228324
q = 1.238325 AU P = 3.053 years
1977 ET R. A. (1950) Decl. Delta r B
Sept.24 23 03.87 +17 37.0
Oct. 4 23 11.99 +17 00.5 0.342 1.319 15.5
14 23 21.89 +16 00.9
24 23 33.68 +14 59.5 0.454 1.395 16.3
Nov. 3 23 47.13 +14 09.8
13 0 01.88 +13 38.1 0.614 1.486 17.3
23 0 17.73 +13 26.4
Dec. 3 0 34.37 +13 33.5 0.822 1.586 18.1
13 0 51.63 +13 56.5
23 1 09.39 +14 32.6 1.072 1.692 18.9
B = 16.8 + 5 log Delta + 5 log r + 0.023 (phase angle)
E. Bowell, Lowell Observatory, reports that observations by L.
Martin and himself on Sept. 15 yielded a light variation of (total)
amplitude 0.84 magnitude in B and suggested a rotation period of ~
5.9 hours. From the observed mean V = 14.03 and B-V = +0.98 +/- 0.07
it follows that B(1,0) = 16.85.
1977 September 23 (3111) Brian G. Marsden
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