Circular No. 7688

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION

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

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COMET P/2001 Q2 (PETRIEW) Additional astrometry and the following orbital elements by B. G.

Marsden, Smithsonian Astrophysical Observatory, appear on MPEC 2001-Q31. The eccentricity is very uncertain, and this orbit indicates a close approach to Jupiter in 1982. S. Nakano, Sumoto, Japan, has also computed an elliptical orbit and notes the similarity to the orbit of comet 103P.

T = 2001 Sept. 2.186 TT  ω = 182.^{o}294
e = 0.69628  Ω = 214.357 }2000.0
q = 0.94750 AU  i = 14.092
a = 3.11966 AU n^{o} = 0.178872 P = 5.51 years
2001 TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Aug. 19 5^{h}35.^{m}35 +27^{o}56.^{′}2 0.866 0.970 61.^{o}6 66.^{o}6 10.6
21 5 46.76 +27 15.6 0.873 0.964 61.0 66.6 10.5
23 5 57.88 +26 32.3 0.881 0.959 60.5 66.5 10.5
25 6 08.70 +25 46.7 0.890 0.955 59.9 66.3 10.5
27 6 19.20 +24 59.1 0.900 0.952 59.4 66.1 10.6
29 6 29.40 +24 09.9 0.910 0.950 59.0 65.8 10.6
31 6 39.30 +23 19.3 0.920 0.948 58.6 65.4 10.6
Sept. 2 6 48.90 +22 27.5 0.931 0.948 58.3 65.0 10.6
4 6 58.21 +21 34.9 0.943 0.948 58.0 64.5 10.6
6 7 07.23 +20 41.7 0.954 0.949 57.8 63.9 10.7
8 7 15.98 +19 48.0 0.966 0.951 57.6 63.4 10.7
10 7 24.47 +18 54.0 0.979 0.954 57.4 62.8 10.8
12 7 32.69 +18 00.0 0.991 0.958 57.3 62.1 10.8
14 7 40.67 +17 06.0 1.004 0.963 57.3 61.5 10.8
16 7 48.41 +16 12.1 1.016 0.969 57.3 60.8 10.9
18 7 55.91 +15 18.5 1.029 0.976 57.3 60.1 11.0

NOVA CYGNI 2001 No. 2 P. Schmeer, Bischmisheim, Germany, notes that the position provided

by Abe on IAUC 7686 is close to that of a USNO-A2.0-catalogued star with red mag 18.8 and blue mag 19.6 at position end figures 02^{s}.017, 53′′.55.

Visual magnitude estimates: Aug. 19.804 UT, 6.9 (K. Hornoch, Lelekovice, Czech Rep.); 20.183, 7.4 (A. Pereira, Cabo da Roca, Portugal); 20.848, 7.8 (R. J. Bouma, Groningen, Holland); 20.90, 7.9 (J. Carvajal, Avila, Spain); 21.085, 8.1 (Schmeer); 21.274, 8.1 (J. Bedient, Honolulu, HI).

2001 August 21  \begin{matrix}c \\ ◯ \end{matrix} Copyright 2001 CBAT  Daniel W. E. Green