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IAUC 7144: 1999 H1; HZ Her; 1998bu, 1999D, 1999E, 1999X, 1999Z, 1999ac, 1999ai

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                                                  Circular No. 7144
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 1999 H1
     Steven Lee reports his visual discovery of a comet at a star
party near Mudgee, New South Wales.  The following observations are
available:

     1999 UT             R.A. (2000) Decl.        m1    Observer
     Apr. 16.5       14.0          -69            9     Lee
          16.59549   13 49 24.64   -68 21 33.6          Garradd
          16.59650   13 49 23.58   -68 21 33.3            "
          16.59941   13 49 20.80   -68 21 32.3            "
          16.61689   13 49 03.53   -68 21 26.4            "
          16.61777   13 49 02.67   -68 21 26.0            "
          16.61839   13 49 02.14   -68 21 25.7            "

S. Lee (Mudgee, N.S.W.).  Comet diffuse with no visible tail.
G. J. Garradd (Loomberah).  0.45-m f/5.4 reflector + CCD.  m_2 =
   13.9-14.2.  Visually, the comet has a 3' coma slightly elongated
   northward.


HZ HERCULIS
     B. Margon, E. W. Deutsch, Z. M. Leinhardt, and S. F. Anderson,
University of Washington, report:  "It has been noted (IAUC 7139)
that the expected x-ray flux from Her X-1 has not been observed
during the most recent 35-day precession cycle.  Optical spectra of
HZ Her obtained with the ARC 3.5-m telescope at Apache Point on
Apr. 12 UT (system binary phase 0.41, where 0.5 is maximum light)
show prominent C III/N III (464-, 465-nm) and He II (468.6-nm)
emission lines, at strength comparable to that reported previously
in the literature (e.g., Anderson et al. 1994, Ap.J. 436, 319).  As
the great strength of the C III/N III complex is known to be due to
Bowen pumping triggered by intense He II (30.4 nm), and the 468.6-
nm line has very high excitation potential, the conclusion seems
inescapable that HZ Her is still irradiated by the x-ray source."


SUPERNOVAE 1998bu, 1999D, 1999E, 1999X, 1999Z, 1999ac, 1999ai
     CCD V magnitudes by L. Kiss and B. Csak, Piszkesteto, Hungary:
SN 1998bu in NGC 3368, Mar. 19.922 UT, 18.3 +/- 0.4; SN 1999D in
NGC 3690, Mar. 19.863, 17.0 +/- 0.3; SN 1999E, Mar. 19.955, 16.8
+/- 0.3; SN 1999X in CGCG 180-22, Mar. 18.835, 18.3 +/- 0.4; SN
1999Z in UGC 5608, Mar. 19.910, 17.3 +/- 0.3; SN 1999ac in NGC
6063, Mar. 19.988, 14.2 +/- 0.1; SN 1999ai, Mar. 19.939, 18.9 +/-
0.4.

                      (C) Copyright 1999 CBAT
1999 April 16                  (7144)            Daniel W. E. Green

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