Circular No. 7262

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

Phone 617-495-7244/7440/7444 (for emergency use only)

COMET C/1999 S2 (McNAUGHT-WATSON)

The following precise CCD positions have been reported:

1999 UT α_{2000} δ_{2000} m_{1} Observer
Sept.21.56750 3^{h}12^{m}25.^{s}76 −63^{o}53′48′′.2  Broughton
21.61564 3 12 24.27 −63 53 57.6 15.2  _{”}
22.44744 3 11 58.03 −63 56 15.8 16.1 Griffin
22.45176 3 11 57.59 −63 56 16.1 16.2  _{”}
22.46615 3 11 57.41 −63 56 19.1 16.1  _{”}
22.47189 3 11 57.11 −63 56 18.9  _{”}

J. Broughton (Reedy Creek). 0.25-m f/6.7 Schmidt-Cassegrain. Coma

diameter ∼ 20′′. I. P. Griffin, M. Arthur, D. Wyers and L. Murphy (Auckland Observatory).

0.50-m f/6.4 Cassegrain reflector. The following parabolic orbital elements are extremely uncertain:

T = 2001 Aug. 18.896 TT  ω = 324.^{o}265
Ω = 66.278 }2000.0
q = 6.83526 AU  i = 66.713
1999TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Sept. 19 3^{h}13.^{m}71 −63^{o}46.^{′}3 7.845 8.199 107.^{o}2 6.^{o}7 15.6
29 3 08.10 −64 12.5 7.819 8.165 106.8 6.7 15.6
Oct. 9 3 00.97 −64 28.9 7.802 8.131 105.8 6.8 15.6
19 2 52.69 −64 33.3 7.794 8.097 104.2 6.9 15.5
29 2 43.75 −64 23.8 7.796 8.063 102.1 6.9 15.5
Nov. 8 2 34.73 −63 59.7 7.805 8.030  99.6 7.0 15.5
18 2 26.20 −63 20.5 7.823 7.997  96.6 7.1 15.5
28 2 18.66 −62 27.3 7.846 7.964  93.3 7.1 15.5
Dec. 8 2 12.48 −61 21.4 7.875 7.932  89.7 7.1 15.5
18 2 07.86 −60 04.7 7.907 7.900  86.0 7.1 15.5

COMET C/1999 N2 (LYNN) Total visual magnitude estimates: Aug. 13.88 UT, 7.6 (J. Carvajal,

Avila, Spain, 10 × 70 binoculars); 20.83, 8.1 (M. Lehký, Hradec Králové, Czech Republic, 0.20-m reflector); 30.14, 8.7 (R. Keen, Mt. Thorodin, CO, 0.15-m reflector); Sept. 4.83, 9.9 (R. J. Bouma, Lattrop, The Netherlands, 0.16-m reflector); 10.78, 11.2 (V. S. Nevski, Vitebsk, Belarus, 0.30-m reflector); 15.78, 10.8 (K. Hornoch, Lelekovice, Czech Republic, 0.35-m reflector).

1999 September 22  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1999 CBAT  Brian G. Marsden