Circular No. 7285

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 S3 (LINEAR)

Ephemeris extension to IAUC 7265 (elements MPEC 1999-T25):

1999TT α_{2000} δ_{2000} Δ r ϵ β m_{1}
Oct. 9 0^{h}03.^{m}75 +55^{o}49.^{′}4 1.137 1.930 129.^{o}1 23.^{o}7 12.1
14 23 30.50 +57 36.2 1.152 1.919 126.4 24.7 12.1
19 22 56.95 +58 33.9 1.177 1.911 122.9 26.0 12.2
24 22 25.42 +58 48.3 1.211 1.904 119.0 27.2 12.2
29 21 57.58 +58 29.6 1.252 1.899 115.0 28.3 12.3
Nov. 3 21 34.22 +57 49.3 1.299 1.896 110.9 29.3 12.3
8 21 15.34 +56 57.8 1.351 1.894 107.0 30.0 12.4
13 21 00.50 +56 03.0 1.405 1.895 103.3 30.6 12.5
18 20 49.10 +55 10.6 1.461 1.897  99.7 30.9 12.6
23 20 40.55 +54 24.0 1.518 1.902  96.5 31.1 12.7
28 20 34.30 +53 45.3 1.574 1.908  93.5 31.1 12.8

Visual m_{1} estimates: Oct. 8.80 UT, 12.7 (K. Sárneczky, Ráktanya, Hungary, 0.39-m reflector); 13.09, 12.4 (R. J. Bouma, Groningen, The Netherlands, 0.25-m reflector); 16.83, 11.6 (K. Hornoch, Lelekovice, Czech Republic, 0.35-m reflector).

COMET C/1999 S4 (LINEAR)

Ephemeris extension to IAUC 7267, from improved parabolic orbital elements on MPEC 1999-U14:

T = 2000 July 26.4630 TT  ω = 150.^{o}9862
Ω = 83.1500 }2000.0
q = 0.766618 AU  i = 149.3454
1999TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Oct. 19 4^{h}45.^{m}67 +35^{o}56.^{′}0 3.393 4.096 129.^{o}2 10.^{o}9 15.8
29 4 31.67 +36 35.1 3.167 3.987 140.9  9.0 15.5
Nov. 8 4 13.86 +37 01.4 2.972 3.877 152.4  6.8 15.3
18 3 52.66 +37 06.9 2.816 3.766 161.4  4.8 15.0
28 3 29.16 +36 44.9 2.703 3.653 161.7  4.9 14.8
Dec. 8 3 05.02 +35 52.9 2.637 3.539 152.4  7.4 14.6
18 2 42.11 +34 35.2 2.614 3.424 139.7 10.7 14.4
28 2 21.93 +33 01.3 2.630 3.308 126.2 13.9 14.3
1999 October 19  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1999 CBAT  Daniel W. E. Green