Circular No. 5789

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)

1993 HA_{2}

D. L. Rabinowitz, Lunar and Planetary Laboratory, reports his discovery of a slow-moving asteroidal object. Available precise positions:

1993 UT α_{2000} δ_{2000} V Observer
Apr. 26.28179 14^{h}08^{m}56.^{s}38 −14^{o}12′46′′.1 20.0 Rabinowitz
26.31486 14 08 55.90 −14 12 44.3 20.2  _{”}
26.34835 14 08 55.45 −14 12 43.0 20.0  _{”}
27.21471 14 08 42.96 −14 12 07.4 20.0  _{”}
27.22301 14 08 42.82 −14 12 06.6 20.0  _{”}
27.23102 14 08 42.72 −14 12 06.5 20.0  _{”}
28.19026 14 08 28.97 −14 11 26.4 20.5  _{”}
28.20179 14 08 28.76 −14 11 25.5 20.1  _{”}
28.22525 14 08 28.43 −14 11 24.4 20.3  _{”}
29.26570 14 08 13.36 −14 10 41.3 20.5  _{”}
29.28777 14 08 13.07 −14 10 39.9 20.0  _{”}
29.31249 14 08 12.72 −14 10 39.1 20.2  _{”}
30.22551 14 07 59.67 −14 10 01.0 20.5  _{”}
30.24824 14 07 59.37 −14 09 58.6 20.0  _{”}
May 11.61686 14 05 21.24 −14 02 11.1  McNaught
11.62031 14 05 21.19 −14 02 10.9  _{”}
11.65243 14 05 20.74 −14 02 09.3  _{”}
11.65671 14 05 20.68 −14 02 09.2  _{”}
13.25397 14 04 59.43 −14 01 07.4 20.1 Rabinowitz
13.29370 14 04 58.91 −14 01 06.1 20.3  _{”}
13.32135 14 04 58.48 −14 01 05.4 20.2  _{”}

D. L. Rabinowitz (Kitt Peak). 0.91-m Spacewatch telescope. R. H. McNaught, D. I. Steel, and C. Pollas (Siding Spring). 1.0-m reflector

+ CCD. Measurer McNaught.

Computations by B. G. Marsden, Center for Astrophysics, indicate that the object is now ∼ 11-12 AU from the earth and probably in an orbit that is quite eccentric, although the solution is still very indeterminate:

T = 1988 Mar. 20.44 TT  ω = 123.^{o}55
e = 0.5521  Ω = 31.94 }2000.0
q = 10.3839 AU  i = 18.68

a = 23.1832 AU n^{o} = 0.00883 P = 111.6 years

1993 May 13 Daniel W. E. Green