Circular No. 7127

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION

Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.

IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)

        URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304

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COMET C/1999 E1 (LI) Further CCD precise positions have been reported as follows:

1999 UT α_{2000} δ_{2000} m_{1} Observer
Mar. 17.01175 6^{h}25^{m}59.^{s}36 +5^{o}26′47′′.0 16.3 Jacques
17.02198 6 25 59.56 +5 26 55.7 16.0  _{”}
17.02439 6 25 59.72 +5 26 55.8 15.6 Griffin
17.04863 6 26 00.14 +5 27 12.2 15.6  _{”}
17.46832 6 26 09.44 +5 32 07.8 17.2 Garradd
17.47269 6 26 09.55 +5 32 11.0 17.1  _{”}

C. Jacques and L. Duczmal (Serra da Piedade). 0.3-m f/3.3 Schmidt-

Cassegrain. I. P. Griffin, R. C. Maddison, R. K. Fox and W. Weimer (Cocoa). 0.3-m

f/5 reflector. G. J. Garradd (Loomberah). 0.45-m f/5.4 reflector.

Parabolic orbital elements from 10 observations Mar. 13-17:

T = 1999 Mar. 30.763 TT  ω = 339.^{o}606
Ω = 127.230 }2000.0
q = 4.05520 AU  i = 47.246
1999 TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Mar. 13 6^{h}24.^{m}66 + 4^{o}39.^{′}3 3.706 4.058 103.^{o}7 13.^{o}8 15.4
18 6 26.36 + 5 38.3 3.773 4.057  99.4 14.0 15.5
23 6 28.43 + 6 35.2 3.842 4.056  95.2 14.2 15.5
28 6 30.88 + 7 29.8 3.913 4.055  91.0 14.2 15.5
Apr. 2 6 33.66 + 8 22.1 3.985 4.055  86.9 14.2 15.6
7 6 36.78 + 9 12.0 4.057 4.056  82.8 14.2 15.6
12 6 40.20 + 9 59.5 4.130 4.057  78.8 14.0 15.7

COMET C/1997 BA_{6} (SPACEWATCH) Total visual magnitude estimates: 1998 Nov. 17.50 UT, 14.1 (A. Hale,

Cloudcroft, NM, 0.41-m reflector); 22.49, 14.0 (Hale); Dec. 17.45, 13.7 (Hale); 27.81, 14.0 (A. Pearce, Nedlands, Western Australia, 0.41-m reflector); 1999 Jan. 11.77, 13.8 (Pearce); 20.80, 13.9 (Pearce); Feb. 21.73, 13.7 (Pearce); 23.73, 13.7 (Pearce); Mar. 14.54, 13.3 (M. Mattiazzo, Wallaroo, South Australia, 0.20-m reflector).

1999 March 17  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1999 CBAT  Brian G. Marsden