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IAUC 6837: 1997 XF11; C/1997 W2, C/1998 E1

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                                                  Circular No. 6837
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)


1997 XF11
     This object, discovered by J. V. Scotti in the course of the Spacewatch
program at the University of Arizona on 1997 Dec. 6 (cf. MPEC 1997-Y11) and
with H = 17.0 recognized as one of the 108 "potentially hazardous asteroids"
(PHAs), has been under observation through 1998 Mar. 4, the latest data
having been obtained by P. J. Shelus with the 0.76-m relector at the
McDonald Observatory.  An orbit computation from the 88-day arc appears on
MPEC 1998-E13 and MPC 31424.  This nominal orbit indicates that the object
will pass only 0.00031 AU from the earth on 2028 Oct. 26.73 UT!  Error
estimates suggest that passage within 0.002 AU is virtually certain, this
figure being decidedly smaller than has been reliably predicted for
generally fainter PHAs in the foreseeable future.  The following ephemeris
is given in the hope that further observations will allow refinement of the
2028 miss distance; physical observations would also presumably be useful.
The object will next be at opposition in Feb. 2000 at V = 19.3.  There will
also be an approach to a distance of 0.065 AU on 2002 Oct. 31 (V = 13.7).

1998 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase    V
Mar.  8     6 15.92    +17 56.7    1.557    2.070  106.5   27.4   20.8
     18     6 22.81    +18 18.0    1.701    2.089   98.2   28.1   21.0
     28     6 32.08    +18 33.4    1.846    2.106   90.5   28.3   21.2
Apr.  7     6 43.26    +18 42.1    1.988    2.119   83.3   28.0   21.4
     17     6 55.94    +18 43.5    2.126    2.128   76.5   27.3   21.5
     27     7 09.81    +18 36.9    2.258    2.135   70.0   26.3   21.6
May   7     7 24.64    +18 22.1    2.382    2.139   63.9   25.1   21.7
     17     7 40.21    +17 58.8    2.497    2.139   57.9   23.6   21.8
     27     7 56.37    +17 26.9    2.602    2.136   52.2   22.0   21.8
June  6     8 13.00    +16 46.4    2.695    2.131   46.7   20.3   21.8
     16     8 30.00    +15 57.3    2.777    2.122   41.3   18.4   21.8
     26     8 47.30    +14 59.7    2.845    2.110   36.0   16.5   21.8
July  6     9 04.85    +13 54.0    2.901    2.094   30.9   14.4   21.7


COMETS C/1997 W2 AND C/1998 E1
     The SOHO-LASCO Consortium has reported two more sungrazing comets.
Further details are given on MPEC 1998-E21 and 1998-E22.

          UT                R.A. (2000) Decl.
     1997 Nov. 19.360      15 33.4      -21 54     C/1997 W2
     1998 Mar.  2.985      23 12.8      - 7 44     C/1998 E1

                      (C) Copyright 1998 CBAT
1998 March 11                  (6837)              Brian G. Marsden

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