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IAUC 7028: AX J0105-722; SNe; N IN M31; 21P

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                                                 Circular No. 7028
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
Phone 617-495-7244/7440/7444 (for emergency use only)


AX J0105-722
     J. Yokogawa and K. Koyama, Kyoto University, communicate:  "An
ASCA observation made on 1996 May 21-23 detected pulsations with a
period of 3.34300 +/- 0.00003 s from a source at R.A. = 1h05m06s,
Decl. = -72o11'08" (equinox 2000.0; +/- 1' at 90-percent
confidence), designated as AX J0105-722.  The position of this
source coincides with RX J0105.3-7210 and the radio supernova
remnant DEM S128 (Filipovic et al. 1998, A.Ap. Suppl. 127, 119).
However, the x-ray spectrum with a photon index of 2.2 +/- 0.3 is
harder than is usually seen in supernova remnants.  Since the
significance of the pulse detection is 99.5 percent, we encourage
independent confirmations of the pulsation."


SUPERNOVAE
     L. Germany reports, on behalf of the the Mount Stromlo Abell
Cluster Supernova Search Team (cf. IAUC 6639), types of two
supernovae and several galaxy redshifts obtained from spectra
(resolution 0.4 nm) taken with the Mount Stromlo 2.3-m telescope on
Oct. 10 and 11.  The following redshifts were obtained for the host
galaxies of the corresponding supernovae:  1998do, 0.092; 1998dp,
0.057; 1998du, 0.076; 1998dv, 0.156; 1998dw, 0.050.  SN 1998dz has
no visible host to magnitude R = 21 and is a type-Ia event, 30 days
past maximum light, at z about 0.09.  SN 1998ea is a type-Ia
supernova at z = 0.057, 20 days past maximum light.


NOVA IN M31
     N. N. Samus, Sternberg Astronomical Institute, reports the
discovery by R. Inasaridze, G. Kimeridze, and M. Nikolashvili at
the Abastumani Observatory of an apparent nova in M31 located at
R.A. = 0h42m33s.93, Decl. = +41o04'56".8 (equinox 2000.0).  The new
star was at photographic magnitudes 18.3 on Aug. 26 and 16.6 on
Aug. 29; it has been subsequently confirmed by A. Alksnis (Latvian
Radioastrophysical Observatory) and A. Sharov (Sternberg Institute)
on Baldone and Crimean plates.  Sharov also confirms that the
object is not present on a number of earlier photographs or in
Hodge's Atlas of M31.


COMET 21P/GIACOBINI-ZINNER
     Visual m_1 estimates by J. Bortle, Stormville, NY (0.41-m
refl.):  Aug. 28.06 UT, 11.6; Sept. 14.03, 10.8; 18.03, 10.4;
29.02, 9.9; Oct. 12.01, 9.6.

                      (C) Copyright 1998 CBAT
1998 October 14                (7028)            Daniel W. E. Green

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