Circular No. 6799

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

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

COMET C/1995 O1 (HALE-BOPP)

Ephemeris extension to IAUC 6712 (elements MPC 30738):

1997 /98 α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Dec. 28 6^{h}25.^{m}12 −64^{o}19.^{′}1 3.716 3.883 92.^{o}4 14.^{o}7 6.7
Jan. 7 6 00.07 −64 22.7 3.831 3.990 92.1 14.3 6.9
17 5 38.11 −63 47.3 3.953 4.095 91.3 13.9 7.1
27 5 20.61 −62 42.7 4.081 4.200 90.1 13.6 7.3
Feb. 6 5 07.95 −61 18.9 4.214 4.304 88.6 13.2 7.5
16 4 59.82 −59 45.1 4.348 4.407 86.9 12.9 7.6
26 4 55.59 −58 08.2 4.484 4.509 85.1 12.6 7.8
Mar. 8 4 54.61 −56 33.2 4.620 4.610 83.3 12.3 8.0
18 4 56.22 −55 04.0 4.754 4.710 81.5 12.1 8.1
28 4 59.92 −53 43.1 4.885 4.810 79.8 11.8 8.3
Apr. 7 5 05.27 −52 32.2 5.013 4.908 78.2 11.5 8.4
17 5 11.93 −51 32.7 5.137 5.006 76.9 11.3 8.5
27 5 19.61 −50 45.2 5.257 5.103 75.8 11.0 8.7
May 7 5 28.09 −50 10.2 5.371 5.200 74.9 10.8 8.8
17 5 37.16 −49 48.0 5.481 5.295 74.2 10.6 8.9
27 5 46.66 −49 38.5 5.585 5.390 73.8 10.4 9.1
June 6 5 56.46 −49 41.9 5.685 5.485 73.6 10.2 9.2
16 6 06.41 −49 57.7 5.780 5.578 73.6 10.1 9.3

COMET C/1997 D1 (MUELLER)

Ephemeris extension to IAUC 6738 (elements MPC 30957):

1997 /98 α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Dec. 28 3^{h}50.^{m}31 −11^{o}39.^{′}7 1.681 2.415 128.^{o}0 18.^{o}7 12.5
Jan. 7 3 21.74 −12 54.6 1.894 2.458 113.5 21.5 12.8
17 3 01.59 −13 23.9 2.135 2.506 100.3 22.7 13.1
27 2 48.12 −13 26.6 2.389 2.557  88.3 22.6 13.5
Feb. 6 2 39.66 −13 15.1 2.642 2.611  77.4 21.6 13.8
16 2 34.90 −12 57.4 2.887 2.669  67.5 20.0 14.1
26 2 32.85 −12 37.9 3.117 2.730  58.3 18.0 14.3
Mar. 8 2 32.80 −12 19.8 3.328 2.793  49.8 15.8 14.6
18 2 34.20 −12 05.2 3.516 2.858  42.2 13.5 14.8
28 2 36.66 −11 55.6 3.679 2.926  35.6 11.5 15.0

1997 December 30  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1997 CBAT  Daniel W. E. Green