Circular No. 5896

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)

COMET MUELLER (1993s)

The following precise positions have been reported:

1993 UT α_{2000} δ_{2000} m_{1} Observer
Nov. 23.40387 6^{h}58^{m}10.^{s}79 +20^{o}42′23′′.0  Balam
23.40786 6 58 10.70 +20 42 23.3  _{”}
23.41267 6 58 10.66 +20 42 24.0  _{”}
23.41678 6 58 10.60 +20 42 24.7  _{”}
24.82674 6 57 46.45 +20 45 54.0 17.5 Seki
25.41231 6 57 36.08 +20 47 20.7  Balam
25.42159 6 57 35.90 +20 47 22.3  _{”}
25.42958 6 57 35.76 +20 47 23.3  _{”}
25.43356 6 57 35.68 +20 47 24.0  _{”}

D. D. Balam and J. B. Tatum (Dominion Astrophysical Observatory, Vic-

toria). 1.82-m Plaskett telescope + CCD. T. Seki (Geisei). 0.60-m f/3.5 reflector. Coma 5′′ (north-south) ×15′′

(east-west). Tail 1′ in p.a. 280^{o}. Communicated by S. Nakano.

The following parabolic orbital elements are by the undersigned. It is not improbable that the comet is of short period.

T = 1994 Dec. 29.901 TT  ω = 86.^{o}793
Ω = 100.021 }2000.0
q = 2.31079 AU  i = 20.966
1993/94 α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Nov. 19 6^{h}59.^{m}24 +20^{o}32.^{′}1 4.061 4.789 132.^{o}9 8.^{o}7 17.8
29 6 56.42 +20 56.7 3.878 4.709 143.7 7.1 17.7
Dec. 9 6 52.16 +21 25.5 3.718 4.629 154.8 5.2 17.5
19 6 46.65 +21 57.9 3.587 4.549 166.3 2.9 17.4
29 6 40.22 +22 32.7 3.486 4.469 178.0 0.4 17.2
Jan. 8 6 33.34 +23 08.5 3.417 4.389 170.1 2.2 17.1
18 6 26.57 +23 44.1 3.379 4.309 158.3 4.8 17.0
28 6 20.47 +24 18.4 3.371 4.229 146.7 7.3 16.9
Feb. 7 6 15.56 +24 50.9 3.388 4.149 135.5 9.6 16.8

PERIODIC COMET ENCKE Total magnitude estimate by H. Mikuž, Ljubljana, Slovenia (0.20-m

Baker-Schmidt camera + CCD + V filter): Nov. 16.84 UT, 14.6.

1993 November 26 Brian G. Marsden