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IAUC 7688: P/2001 Q2; N Cyg 2001 No. 2

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                                                  Circular No. 7688
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


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          Peri. = 182.294
     e = 0.69628                      Node  = 214.357   2000.0
     q = 0.94750 AU                   Incl. =  14.092
       a =  3.11966 AU     n = 0.178872     P =   5.51 years

2001 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Aug. 19     5 35.35   +27 56.2   0.866   0.970   61.6   66.6   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 02s.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).

                      (C) Copyright 2001 CBAT
2001 August 21                 (7688)            Daniel W. E. Green

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