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IAUC 6554: P/1997 B1; 1997X

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                                                  Circular No. 6554
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/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET P/1997 B1 (KOBAYASHI)
     Elliptical orbital elements from the positions on IAUC 6553:

     T = 1997 Mar.  4.295 TT          Peri. = 184.202
     e = 0.76831                      Node  = 329.032   2000.0
     q = 2.06219 AU                   Incl. =  12.490
       a =  8.90047 AU     n = 0.037118     P =  26.55 years

1997 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m2
Feb.  1     9 59.69    +16 20.4    1.120    2.088  165.4    6.8     17.4
      6     9 56.88    +15 42.4    1.101    2.081  170.9    4.3     17.2
     11     9 53.77    +15 03.3    1.088    2.074  176.2    1.8     17.0
     16     9 50.54    +14 22.9    1.082    2.069  177.2    1.3     16.9
     21     9 47.36    +13 41.3    1.082    2.066  172.0    3.8     17.1
     26     9 44.40    +12 58.7    1.088    2.063  166.5    6.4     17.2
Mar.  3     9 41.83    +12 15.3    1.099    2.062  161.1    9.0     17.4
      8     9 39.76    +11 31.3    1.117    2.063  155.8   11.4     17.5
     13     9 38.33    +10 46.8    1.140    2.064  150.6   13.7     17.6

     S. Nakano, Sumoto, Japan, reports that images obtained at Kuma Kogen
by A. Nakamura (0.6-m f/6 Ritchey-Chretien) on Feb. 4.75 UT show an
obvious coma and a tail 35" long in p.a. 290 deg.


SUPERNOVA 1997X IN NGC 4691
     S. Benetti, M. Turatto and I. Perez, European Southern Observatory;
and L. Wisotzki, Hamburger Sternwarte, communicate: "Inspection of a CCD
spectrum (range 316-1000 nm, resolution 2.0 nm), obtained on Feb. 4.39
UT with the 1.52-m telescope (+ Boller & Chivens spectrograph) at La
Silla, confirms that supernova 1997X is of type Ic and about one week
after maximum.  The spectrum, which shows a quite red continuum, is
dominated by lines (with P-Cyg profile) of Ca II (H and K + infrared
triplet) and Fe II.  A strong line (also with P-Cyg profile, maximum
measured at 585.0 nm, minimum at 566.3 nm) could be identified with a
blend of He I 587.6-nm and Na I D.  Other He I lines could be present
at (mimima) 646.0 nm, 685.5 and possibly 479.5 nm.  If the helium
identification is confirmed (the helium lines becoming more intense at
later phases), the expansion velocity deduced for the helium-emitting
layer, about 10 000 km/s, is smaller than in the type Ic SNe 1987M and
1994I (Clocchiatti et al. 1996, Ap.J. 462, 462).  The Ca II expansion
velocity is about 16 000 km/s.  The O I 777.4-nm line is also present."

                      (C) Copyright 1997 CBAT
1997 February 4                (6554)              Brian G. Marsden

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