Circular No. 5711

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 BX_{3}

Further precise positions have been reported as follows:

1993 UT  α_{2000}  δ_{2000}  Observer
Feb. 14.58569 11^{h}21^{m}09.^{s}36 −12^{o}09′33′′.3 McNaught
14.59417 11 21 09.59 −12 09 10.9  _{”}
15.50961 11 22 01.90 −11 27 46.3 Gilmore
15.53160 11 22 02.51 −11 26 49.6  _{”}
16.61528 11 22 54.83 −10 39 15.9  _{”}
16.63715 11 22 55.19 −10 38 18.0  _{”}

R. H. McNaught (Bugaldie, N.S.W.). Uppsala Southern Schmidt. A. C. Gilmore (Mt. John Observatory). Measurer P. M. Kilmartin.

Improved orbital elements from 11 observations Jan. 31-Feb. 16:

T = 1993 Jan. 5.3209 TT  ω = 289.^{o}7703
e = 0.283041  Ω = 175.6982 }2000.0
q = 1.003470 AU  i = 2.8085

a = 1.399620 AU n^{o} = 0.5952355 P = 1.656 years

1993 TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  V
Feb. 17 11^{h}23.^{m}22 −10^{o}23.^{′}5 0.097 1.074 149.^{o}9 27.^{o}5 17.3
22 11 25.96 − 6 59.5 0.108 1.089 156.5 21.3 17.4
27 11 27.15 − 3 59.0 0.121 1.106 163.0 15.1 17.5
Mar. 4 11 27.42 − 1 22.7 0.135 1.124 169.5  9.3 17.5
9 11 27.26 + 0 49.5 0.151 1.143 175.6  3.8 17.5
14 11 26.98 + 2 38.6 0.169 1.163 177.7  2.0 17.7
19 11 26.85 + 4 06.0 0.189 1.183 172.3  6.5 18.2
24 11 27.13 + 5 12.9 0.211 1.204 166.9 10.9 18.7

SW URSAE MAJORIS Recent visual magnitude estimates show that this object is undergo-

ing a bright outburst: Feb. 16.13 UT, [13.5 (B. H. Granslo, Fjellhamar, Norway); 16.78, 10.6 (L. Szentasko, Budapest, Hungary); 16.80, 10.7 (R. Fidrich, Budapest, Hungary); 17.11, 10.9 (Granslo); 17.74, 11.2 (H. Dahle, Oslo, Norway).

1993 February 18 Brian G. Marsden