Circular No. 6112

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION

Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) Phone 617-495-7244/7440/7444 TWX 710-320-6842 ASTROGRAM CAM

MARSDEN@CFA.HARVARD.EDU or GREEN@CFA.HARVARD.EDU (science)

PERIODIC COMET CLARK (1994t) S. Nakano, Sumoto, Japan, reports the recovery of this comet by A.

Nakamura (Kuma Kogen, 0.60-m f/6.0 Ritchey-Chrétien + CCD):

1994 UT  α_{2000}  δ_{2000}  m_{1}
Dec. 5.85747  13^{h}39^{m}25.^{s}93  −3^{o}30′11′′.6  17.5
5.86123  13 39 26.30  −3 30 13.9
5.86649  13 39 26.96  −3 30 17.9
6.84688  13 41 17.86  −3 41 24.7  17.6
6.85660  13 41 18.99  −3 41 31.4

Nakamura notes the comet as being diffuse with central condensation, with coma diameter 0′.35; on Dec. 5, there was a hint of tail in p.a. 250^{o}.

The following orbital elements by Nakano are from 35 observations, 1984-1994 (mean residual 0′′.92); nongravitational parameters A_{1} = −0.31 ± 0.73, A_{2} = −0.2796 ± 0.0136.

Epoch = 1995 June 12.0 TT

T = 1995 May 31.10630 TT  ω = 208.^{o}85468
e = 0.5020395  Ω = 59.72627 }2000.0
q = 1.5524958 AU  i = 9.50461
a = 3.1177089 AU n^{o} = 0.17904027 P = 5.505 years
1994 /95 α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Dec. 4 13^{h}35.^{m}93 − 3^{o}09.^{′}0 2.760 2.234 48.^{o}6 19.^{o}3 17.9
14 13 54.94 − 5 02.0 2.613 2.178  53.6 21.3 17.7
24 14 14.48 − 6 53.2 2.464 2.122  58.5 23.3 17.4
Jan. 3 14 34.58 − 8 41.8 2.313 2.067  63.3 25.1 17.1
13 14 55.24 −10 27.1 2.162 2.013  68.0 26.9 16.7
23 15 16.50 −12 08.6 2.013 1.960  72.7 28.6 16.4
Feb. 2 15 38.36 −13 45.8 1.867 1.908  77.2 30.2 16.1
12 16 00.81 −15 18.3 1.724 1.859  81.7 31.7 15.7
22 16 23.84 −16 46.0 1.587 1.811  86.0 33.0 15.4
Mar. 4 16 47.40 −18 09.2 1.457 1.766  90.3 34.2 15.0
14 17 11.39 −19 28.3 1.333 1.724  94.5 35.1 14.7
24 17 35.73 −20 44.4 1.218 1.686  98.6 35.8 14.3
Apr. 3 18 00.22 −21 58.9 1.111 1.651 102.8 36.2 14.0
13 18 24.62 −23 14.0 1.014 1.621 107.0 36.2 13.7

1994 December 7 Daniel W. E. Green