Circular No. 6015

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION

Postal Address: Central Bureau for Astronomical Telegrams Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. Telephone 617-495-7244/7440/7444 (for emergency use only) TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505 MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)

COMET NAKAMURA-NISHIMURA-MACHHOLZ (1994m) The following precise positions have been reported:

1994 UT α_{2000} δ_{2000} m_{1} Observer
July 6.52257 3^{h}55^{m}13.^{s}01 +70^{o}12′09′′.6  Sugie
6.77292 3 54 36.69 +70 11 51.2  Seki
6.78281 3 54 35.21 +70 11 50.4  _{”}
7.75833 3 52 08.23 +70 10 22.1 11.6 Nakamura
7.76389 3 52 07.38 +70 10 21.6  _{”}
7.77760 3 52 05.08 +70 10 20.3 10.5 Seki
8.89580 3 49 09.94 +70 08 30.2 12.2 Tichá
8.90235 3 49 08.96 +70 08 29.6  _{”}

A. Sugie (Dynic Astronomical Observatory). 0.25-m f/3.4 Schmidt. T. Seki (Geisei). 0.60-m f/3.5 reflector. A. Nakamura (Kuma Kogen). 0.60-m f/6.0 Ritchey-Chrétien + CCD. J. Tichá, M. Tichý and Z. Moravec (Kleť). 0.57-m f/5 reflector + CCD.

Parabolic orbital elements from 11 observations July 6–8:

T = 1994 July 10.627 TT  ω = 119.^{o}368
Ω = 161.397 }2000.0
q = 1.18077 AU  i = 94.963
1994 TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
July 7 3^{h}54.^{m}0 +70^{o}11.^{′}5 1.422 1.182 55.^{o}0 44.^{o}8 9.5
12 3 40.5 +70 03.1 1.345 1.181  58.0 46.9 9.4
17 3 24.40 +69 51.3 1.261 1.185  61.6 49.0 9.2
22 3 05.11 +69 32.4 1.172 1.194  65.7 50.8 9.1
27 2 41.91 +69 00.7 1.077 1.209  70.5 52.4 9.0
Aug. 1 2 14.16 +68 06.7 0.979 1.228  76.0 53.3 8.8
6 1 41.55 +66 34.7 0.880 1.252  82.4 53.4 8.7
11 1 04.66 +64 00.1 0.780 1.280  90.0 52.4 8.5
16 0 25.31 +59 47.1 0.685 1.311  99.3 49.6 8.4
21 23 46.32 +53 09.9 0.600 1.347 110.7 44.6 8.2
26 23 10.49 +43 24.5 0.532 1.385 124.8 36.8 8.0

Visual magnitude estimates: July 7.29 UT, 9.4 (C. Spratt, Victoria, BC, 0.20-m reflector); 7.93, 9.6 (T. Vanmunster, Landen, Belgium, 0.35-m reflector); 8.00, 9.1 (J. D. Shanklin, Cambridge, England, 0.20-m refractor).

1994 July 8 Brian G. Marsden