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IAUC 7562: XTE J0052-723; SUNGRAZING COMETS

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                                                  Circular No. 7562
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)


XTE J0052-723
     R. Corbet, Goddard Space Flight Center (GSFC) and Universities
Space Research Association; F. E. Marshall, GSFC; and C. B.
Markwardt, GSFC and University of Maryland, report:  "We have
discovered a new transient x-ray pulsar in the direction of the
Small Magellanic Cloud from RXTE Proportional Counter Array
observations made on 2000 Dec. 27 and 2001 Jan. 5.  Pulsations were
seen with a period of 4.782 +/- 0.001 s and a double-peaked pulse
profile.  Subsequent slew observations on Jan. 9 give a source
location of R.A. = 0h52m11s, Decl. = -72o20'.3 (equinox 2000.0)
with a 90-percent statistical uncertainty of about 2' in R.A. and
1' in Decl.  Some additional uncertainty in the source position may
be present, due to source variability.  The mean source intensity
on Jan. 9 was about 8 mCrab (2-10 keV).  Earlier observations of
this region on 2000 Dec. 13 and 20 did not detect this source."


SUNGRAZING COMETS
     Further to IAUC 7560, D. Hammer reports his measurements for
additional Kreutz sungrazing comets found by J. Danaher (C/2000 A2
in C3 data), M. Oates (Nov. comets and C/2000 X5 in C2 data), X.-m.
Zhou (C/2000 X4 in C2 data), T. Lovejoy (C/2000 Y4 in C2 and C3
data), and M. Boschat (remaining Dec. comets in C2 data; both Dec.
5 comets also visible in C3) on SOHO website images.  The reduced
observations and orbital elements by B. G. Marsden are given on the
MPECs cited below.

  Comet         2000 UT           R.A. (2000) Decl.       MPEC
  C/2000 A2     Jan. 14.596      19 57.6&  -23 08       2001-A32
  C/2000 W4     Nov. 19.388      15 32.3&  -22 52       2001-A32
  C/2000 W5          27.288      16 14.1&  -22 55       2001-A35
  C/2000 X1     Dec.  3.518      16 43.1&  -24 00       2001-A43
  C/2000 X2           5.904      16 53.6&  -24 53       2001-A43
  C/2000 X3           5.654      16 50.8&  -26 01       2001-A43
  C/2000 X4           5.435      16 51.7&  -24 14       2001-A47
  C/2000 X5           7.076      16 59.3&  -24 29       2001-A47
  C/2000 X6           7.451      17 03.4&  -24 35       2001-A47
  C/2000 X7          10.643      17 16.4&  -24 50       2001-A47
  C/2000 Y4          17.263      17 46.6&  -27 34       2001-A47

                      (C) Copyright 2001 CBAT
2001 January 14                (7562)            Daniel W. E. Green

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