Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 7435: C/1998 V1; C/2000 K6; 1998A, 1998S,, 1999gn

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 7434 SEARCH Read IAUC 7436

View IAUC 7435 in .dvi or .ps format.
IAUC number 

                                                  Circular No. 7435
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1998 V1 (SOHO)
    D. A. Biesecker, Emergent Information Technologies, Inc., and
Goddard Space Flight Center, reports SOHO observations of another
Kreutz sungrazing comet discovered by D. Hammer and Biesecker using
the automated search algorithm developed by Biesecker.  The comet,
which showed a tail, was seen in both the C2 and C3 telescopes.
Astrometry (measured by Hammer and Biesecker, reduced by B. G.
Marsden) and orbital elements appear on MPEC 2000-L07.

     1998 UT           R.A. (2000) Decl.
     Nov. 4.146      14 23.5       -17 27


COMET C/2000 K6 (SOHO)
     Biesecker also reports observations of another Kreutz
sungrazing comet found via the SOHO website by M. Oates, X.
Leprette, and M. Boschat.  The comet, which showed no tail, was
visible in the C2 telescope only.  Astrometry (measured by Hammer
and Biesecker, reduced by Marsden) and orbital elements appear on
MPEC 2000-L08.

     2000 UT           R.A. (2000) Decl.
     May 27.088       4 17.9       +19 42


SUPERNOVAE 1998A, 1998S, AND 1999gn
     S. D. Van Dyk and B. Nelson, Infrared Processing and Analysis
Center, California Institute of Technology; and the Two Micron All
Sky Survey (2MASS) team write:  "During routine 2MASS operations at
Mt. Hopkins and Cerro Tololo, the type-II supernovae 1998A, 1998S,
and 1999gn were observed.   We obtained near-infrared photometry as
part of pipeline processing.  However, complicated backgrounds,
such as host-galaxy spiral arms, limit the accuracy of the
point-spread-function-fitting photometry procedure in the pipeline.
Therefore, DAOPHOT (cf. Stetson 1987, PASP 99, 191) PSF-fitting
photometry was employed to obtain the following magnitudes:  SN
1998A in IC 2627, 1998 Apr. 27.13 UT, J (1.25 microns) = 15.40 +/-
0.06, H (1.65 microns) = 14.94 +/- 0.09, K_s (2.17 microns) = 14.94
+/- 0.16.  SN 1998S in NGC 3877, 1998 Dec. 24.48, J = 15.75 +/-
0.10, H = 14.47 +/- 0.06, K_s = 13.35 +/- 0.04.  SN 1999gn in NGC
4303 (M61), 2000 Feb. 25.27, J = 14.69 +/- 0.04, H = 14.40 +/-
0.06, K_s = 14.06 +/- 0.07."

                      (C) Copyright 2000 CBAT
2000 June 2                    (7435)            Daniel W. E. Green

Read IAUC 7434 SEARCH Read IAUC 7436

View IAUC 7435 in .dvi or .ps format.

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

Valid HTML 4.01!