Circular No. 5602

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 QN E. F. Helin reports her discovery of a fast-moving asteroidal object on

exposures with the 0.46-m Schmidt at Palomar. K. J. Lawrence, J. Alu and P. Rose assisted, Rose making the measurements:

1992 UT  α_{2000}  δ_{2000}  Mag.
Aug. 29.33611  22^{h}39^{m}57.^{s}86  −21^{o}18′18′′.3  16.5
29.36059  22 39 52.88  −21 18 10.9
31.31563  22 33 47.86  −21 05 27.0
31.33802  22 33 43.68  −21 05 16.8
Sept. 1.33576  22 30 44.06  −20 58 10.5
2.21563  22 28 10.78  −20 51 37.7
2.24028  22 28 06.33  −20 51 26.0

Orbital elements by G. V. Williams, Center for Astrophysics:

T = 1992 Apr. 15.170 TT  ω = 201.^{o}649
e = 0.34766  Ω = 356.453 }2000.0
q = 0.77239 AU  i = 9.281

a = 1.18403 AU n^{o} = 0.765000 P = 1.29 years

1992 TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  V
Aug. 26 22^{h}50.^{m}96 −21^{o}35.^{′}8 0.381 1.384 166.^{o}6 9.^{o}8 15.7
31 22 34.76 −21 07.3 0.401 1.404 167.4  9.0 15.9
Sept. 5 22 20.48 −20 28.9 0.427 1.423 163.7 11.4 16.1
10 22 08.45 −19 43.4 0.457 1.441 158.1 15.1 16.4
15 21 58.79 −18 53.6 0.492 1.458 152.1 18.8 16.7
20 21 51.42 −18 01.4 0.530 1.474 146.2 22.3 17.0
25 21 46.17 −17 08.3 0.572 1.490 140.6 25.3 17.3
30 21 42.86 −16 15.1 0.617 1.504 135.3 27.9 17.6
Oct. 5 21 41.26 −15 22.1 0.664 1.517 130.4 30.2 17.8

(4179) TOUTATIS M. Nolan and E. Howell, Lunar and Planetary Laboratory, report that

CCD photometry with the 1.5-m reflector at the Catalina Station gave V = 15.52 ± 0.05 on Aug. 27.23 UT. This indicates that the close-approach prediction in Efemeridy Malykh Planet for 1992 (pages 465-466, 486-487) requires correction by +1 mag.

1992 September 3 Brian G. Marsden