Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

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

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).


Read IAUC 7875  SEARCH Read IAUC 7877

View IAUC 7876 in .dvi or .ps format.
IAUC number


                                                  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

Read IAUC 7875  SEARCH Read IAUC 7877

View IAUC 7876 in .dvi or .ps format.


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!