Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 7886: eta Car; V838 Mon; C/2002 H3, C/2002 H4, C/2002 H5, C/2002 H6

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 7885  SEARCH Read IAUC 7887

View IAUC 7886 in .dvi or .ps format.
IAUC number

                                                  Circular No. 7886
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     M. F. Corcoran, Universities Space Research Association and
Goddard Space Flight Center, reports:  "Recent observations of this
peculiar luminous star with the Proportional Counter Array on the
Rossi X-ray Timing Explorer show that the star has undergone an
especially strong x-ray flare in the band 2-10 keV.  The flare
started on Mar. 12, apparently reached x-ray maximum on Apr. 21,
has not yet declined to the pre-flare brightness level.  The peak
x-ray flux in the and 2-10 keV is 1.8 x 10**-10 erg s**-1 cm**-2;
eta Car has not been this bright in x-rays since 1997 May 29 (i.e.,
about 7 months prior to the x-ray eclipse)."

     T. Rauch, University of Tuebingen; F. Kerber, Space Telescope
European Coordinating Facility, European Southern Observatory (ESO);
F. van Wyk, South African Astronomical Observatory (SAAO); and the
ESO 2p2 Team at La Silla report a dramatic change in the spectrum
of V838 Mon.  Observations obtained from Apr. 16 to 22 with the
SAAO 1.9-m and ESO 1.5-m telescopes show that strong bands of TiO
have emerged and the spectrum now resembles an M5 giant.  The
photospheric temperature is estimated to be close to 3000 K -- a
massive drop compared to the 4000 K reported as late as Mar. 9 (cf.
IAUC 7855).  The molecular features even grew stronger over this
period, indicating that the temperature is still decreasing --
interpreted as an expansion of the photosphere.  Such an expansion
is rather more a feature of a late helium-flash object like V4334
Sgr than is typical for a nova.

COMETS C/2002 H3, C/2002 H4, C/2002 H5, C/2002 H6 (SOHO)
     Further to IAUC 7882, D. Hammer reports his measurements for
four additional Kreutz-sungrazing comets found on C2 images posted
at the SOHO website by X. Leprette (C/2002 H3), X.-M. Zhou (C/2002
H4, C/2002 H5), and M. Meyer (C/2002 H6).  The reduced astrometry
and orbital elements by B. G. Marsden appear on the MPECs cited

  Comet         2002 UT          R.A. (2000) Decl.       MPEC
  C/2002 H3     Apr. 17.660       1 49.4   + 9 40       2002-H47
  C/2002 H4          18.101       1 50.9   + 9 49       2002-H47
  C/2002 H5          19.101       1 51.5   + 9 47       2002-H47
  C/2002 H6          26.243       2 21.1   +12 31       2002-H49

                      (C) Copyright 2002 CBAT
2002 April 29                  (7886)            Daniel W. E. Green

Read IAUC 7885  SEARCH Read IAUC 7887

View IAUC 7886 in .dvi or .ps format.

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

Valid HTML 4.01!