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IAUC 7876: C/2002 C1; XTE J1751-305

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                                                  Circular No. 7876
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 C/2002 C1 (IKEYA-ZHANG)
     H. E. Matthews, National Research Council, Victoria, British Columbia,
and Joint Astronomy Centre, Hawaii (JAC); and T. B. Lowe, JAC, report pointed
spectral-line observations of comet C/2002 C1 made at the James
Clerk Maxwell Telescope, Mauna Kea, in the 1.3-mm and 0.8-mm bands:
"The beamwidths to halfpower are about 21" and 13", respectively.  We
have detected the groundstate rotational transitions HCN 4-3 and 3-2,
HNC 4-3 and 3-2 and CS 5-4.  Observed integrated intensities (in mainbeam
brightness K km/s) were: 3.65 and 0.71 (HCN 3-2, HNC 4-3, Mar. 23.95 UT),
4.10 (HCN 3-2, Mar. 28.82), 0.71 (HNC 3-2, Mar. 29.85), 18.4 (HCN 4-3, Mar.
30.98) and 4.47, 0.62 and 0.74 (HCN 3-2, HNC 3-2, CS 5-4, Apr. 7.93).  CO
has not been detected in two attempts (CO 3-2, Mar. 23.95 and CO 2-1, Apr.
7.93), the absolute upper limit to the peak signal being 0.1 K.  The
velocity width (km/s) to halfpower measured using the HCN lines was 2.6
(Mar. 23.93), 2.4 (Mar. 28.82), 2.2 (Mar. 30.98) and 2.2 (Apr. 7.87) and
thus appears to show a decrease with increasing r."

     Ephemeris extension to IAUC 7858 (elements MPEC 2002-G38):
2002 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Apr. 16    23 19.98    +55 50.0    0.450    0.816   53.0  100.9      4.4
     18    22 54.48    +57 48.3    0.438    0.849   57.0   97.4      4.5
     20    22 25.33    +59 27.0    0.428    0.882   61.2   93.6      4.6
     22    21 52.64    +60 40.1    0.419    0.916   65.7   89.7      4.7
     24    21 17.05    +61 21.5    0.413    0.950   70.3   85.5      4.9
     26    20 39.78    +61 26.5    0.408    0.984   75.1   81.3      5.0
     28    20 02.50    +60 52.6    0.405    1.018   80.0   77.0      5.1
     30    19 26.88    +59 41.1    0.404    1.051   84.9   72.6      5.2
May   2    18 54.19    +57 56.0    0.406    1.085   89.8   68.2      5.4
      4    18 25.09    +55 43.4    0.410    1.119   94.7   63.9      5.6
      6    17 59.70    +53 10.0    0.416    1.153   99.5   59.7      5.7


XTE J1751-305
     Amplifying the private communication mentioned in the item by Wang et al.
on IAUC 7874, C. B. Markwardt, University of Maryland and Goddard Space Flight
Center; and A. Dobrzycki, Harvard-Smithsonian Center for Astrophysics,
report that on Apr. 10.67 UT the Chandra X-ray Observatory observed XTE
J1751-305 with the HRC-S instrument.  The source was detected at a level of
4.66 counts/s at the position R.A. = 17h51m13s.52, Decl. = -30d37'22".9
(equinox 2000.0, 0".6 uncertainty).

                      (C) Copyright 2002 CBAT
2002 April 13                  (7876)              Brian G. Marsden

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