Circular No. 5697

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)

1980 AA = 1993 BC_{2}

G. V. Williams, Minor Planet Center, has found 1993 BC_{2} (cf. IAUC 5695) to be identical with an object found by A. Mrkos at Kleť in 1980, yielding the following orbital elements:

Epoch = 1993 Jan. 13.0 TT

T = 1993 Jan. 10.3276 TT  ω = 168.^{o}0400
e = 0.443894  Ω = 299.2261 }2000.0
q = 1.052286 AU  i = 4.1891

a = 1.892240 AU n^{o} = 0.3786517 P = 2.603 years

1993TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  V
Jan. 23 6^{h}30.^{m}98 +21^{o}32.^{′}8 0.085 1.062 154.^{o}1 23.^{o}9 14.4
25 6 47.59 +19 24.2 0.087 1.065 155.9 22.2 14.4
27 7 03.21 +17 17.4 0.090 1.069 157.4 20.8 14.4
29 7 17.74 +15 15.2 0.094 1.073 158.6 19.6 14.5
31 7 31.18 +13 19.7 0.098 1.077 159.5 18.7 14.6
Feb. 2 7 43.55 +11 32.4 0.102 1.082 160.1 18.1 14.7
4 7 54.88 + 9 53.9 0.107 1.087 160.4 17.7 14.8
6 8 05.25 + 8 24.5 0.113 1.093 160.6 17.5 14.9
8 8 14.72 + 7 04.2 0.119 1.099 160.6 17.4 15.0
10 8 23.38 + 5 52.7 0.125 1.106 160.5 17.4 15.1
12 8 31.30 + 4 49.5 0.132 1.113 160.2 17.4 15.3
14 8 38.56 + 3 53.9 0.140 1.120 160.0 17.6 15.4
16 8 45.22 + 3 05.3 0.147 1.127 159.6 17.8 15.5
18 8 51.38 + 2 23.0 0.155 1.135 159.3 18.0 15.7
20 8 57.08 + 1 46.3 0.164 1.143 158.8 18.2 15.8
22 9 02.38 + 1 14.7 0.173 1.152 158.4 18.5 15.9

CORRIGENDA

On IAUC 5679, for (Chuchibu). read (Chichibu). On IAUC 5684, for de Costa read da Costa On IAUC 5696, ‘Periodic Comet Bus (1993b)’, last line, for +0.05 day.

read –0.05 day.

1993 January 22 Daniel W. E. Green