Circular No. 5855

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)

1992 QB_{1}

The following precise positions have been reported:

1993 UT α_{2000} δ_{2000} R Observer
June 25.37850 0^{h}08^{m}36.^{s}94 +0^{o}59′54′′.7 23.9 Marconi
26.42452 0 08 37.65 +0 59 59.0 23.5  _{”}
July 14.422  0 08 34.68 +0 59 52.2  _{”}
15.429  0 08 33.69 +0 59 46.3  _{”}
15.55616 0 08 33.62 +0 59 45.8  Jewitt
15.59765 0 08 33.58 +0 59 45.5  _{”}
16.416 0 08 32.63 +0 59 40.1 Marconi

G. Marconi and O. Hainaut (European Southern Observatory). 3.6-m New Technology Telescope (June) and 1.5-m Danish telescope (July) + CCD. Measurer Hainaut. July times uncertain by several minutes.

D. Jewitt and J. Luu (Mauna Kea). 2.2-m reflector + CCD.

The following improved orbital elements represent 29 of the 30 available observations with mean residual 0′′.5. The critical 1992 Dec. 25 observation (IAUC 5684) leaves a residual of 2′′.2 in α in relation to the others. Further observations will be particularly desirable in Jan. 1994, when the object has resumed its direct motion.

Epoch = 1993 Aug. 1.0 TT

T = 2022 July 6.5261 TT  ω = 44.^{o}0135
e = 0.087611  Ω = 359.4129 }2000.0
q = 39.989399 AU  i = 2.2128
a = 43.829347 AU n^{o} = 0.00339670 P = 290.2 years
1993/94 α_{2000}  δ_{2000}  Δ  r  ϵ  β  V
Oct. 10 0^{h}03.^{m}48 + 0^{o}27.^{′}7 39.875 40.837 164.^{o}2 0.^{o}4 23.6
20 0 02.78 + 0 23.2 39.937 40.835 154.1 0.6 23.7
30 0 02.15 + 0 19.2 40.027 40.834 144.0 0.8 23.7
Nov. 9 0 01.62 + 0 15.8 40.140 40.832 133.8 1.0 23.7
19 0 01.20 + 0 13.2 40.275 40.831 123.6 1.2 23.7
29 0 00.92 + 0 11.5 40.427 40.829 113.4 1.3 23.8
Dec. 9 0 00.79 + 0 10.7 40.591 40.828 103.2 1.3 23.8
19 0 00.81 + 0 10.9 40.761 40.826  93.1 1.4 23.8
29 0 00.98 + 0 12.1 40.934 40.825  82.9 1.4 23.8
Jan. 8 0 01.31 + 0 14.3 41.102 40.823  72.8 1.3 23.8
18 0 01.78 + 0 17.4 41.262 40.821  62.8 1.2 23.8

1993 September 4 Brian G. Marsden