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IAUC 7040: C/1998 U3; AX J0049-732

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                                                 Circular No. 7040
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)
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Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1998 U3 (JAGER)
     Ninety-one precise positions that appear on MPEC 1998-U26,
spanning Oct. 24-27, yield the following preliminary parabolic
orbital elements.  This comet is likely of short period.

     T = 1998 Dec.  9.919 TT          Peri. = 138.252
                                      Node  = 313.194   2000.0
     q = 2.66631 AU                   Incl. =  17.842

1998 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct. 14     6 31.93   +41 23.7   2.323   2.733  103.5   20.8   12.7
     19     6 37.90   +41 28.6   2.258   2.722  107.0   20.5   12.6
     24     6 43.29   +41 32.4   2.195   2.712  110.7   20.1   12.5
     29     6 48.03   +41 35.0   2.135   2.703  114.5   19.5   12.5
Nov.  3     6 52.10   +41 36.3   2.077   2.694  118.4   18.9   12.4
      8     6 55.46   +41 36.3   2.022   2.687  122.4   18.1   12.3
     13     6 58.07   +41 34.9   1.971   2.681  126.6   17.2   12.3
     18     6 59.89   +41 31.6   1.923   2.676  130.9   16.2   12.2
     23     7 00.93   +41 26.3   1.879   2.672  135.2   15.1   12.1
     28     7 01.19   +41 18.5   1.840   2.669  139.7   13.8   12.1
Dec.  3     7 00.72   +41 07.7   1.805   2.667  144.2   12.5   12.0
      8     6 59.56   +40 53.7   1.775   2.666  148.6   11.1   12.0
     13     6 57.79   +40 35.9   1.752   2.667  153.0    9.6   12.0

     Total visual magnitude and coma-diameter estimates: Oct. 26.01
UT, 12.2, 1'.7 (K. Hornoch, Lelekovice, Czech Republic, 0.13-m
reflector); 26.42, 12.3, 2' (A. Hale, Cloudcroft, NM, 0.41-m
reflector); 26.97, 12.3, 1'.5 (R. J. Bouma, Groningen, The
Netherlands, 0.25-m reflector); 27.17, 12.3, 1'.0 (A. Pereira, Cabo
da Roca, Portugal, 0.25-m reflector).


AX J0049-732
     K. Imanishi, J. Yokogawa, and K. Koyama, Kyoto University,
write:  "An ASCA observation made on 1997 Nov. 13 detected x-ray
pulsations with a period of 9.1321 +/- 0.0004 s from a source at
R.A. = 0h49m23s, Decl. = -73o12'38" (equinox 2000.0; +/- 1' at
90-percent confidence), designated as AX J0049-732.  The x-ray
flux at 2-10 keV was about 8 x 10E-13 erg sE-1 cmE-2."

                      (C) Copyright 1998 CBAT
1998 October 27                (7040)            Daniel W. E. Green

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