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IAUC 7066: 1998ey; PKS 0405-385; C/1998 U5

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                                                 Circular No. 7066
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)


SUPERNOVA 1998ey IN NGC 7080
     P. Garnavich, S. Jha, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report:  "A spectrum of SN 1998ey was
obtained by P. Berlind (Fred L. Whipple Observatory) with the 1.5-m
Tillinghast telescope on Dec. 10.1 UT.  The spectrum shows four
broad peaks at rest wavelengths of 394, 453, 537, and 650 nm
(assuming a recession velocity of 4670 km/s, derived from narrow
H-alpha emission from the host galaxy).  The widths of features at
537 and 650 nm are 20 000 km/s FWHM.  The spectrum is identical to
that of the peculiar type-Ic supernova 1997ef (cf. IAUC 6778, 6786),
about 2 weeks after discovery, and similar to early spectra of SN
1998bw associated with GRB 980425 (IAUC 6895).  A search of the
BATSE triggers between Nov. 1 and Dec. 4 shows no clear GRB
counterpart to SN 1998ey."


PKS 0405-385
     L. Kedziora-Chudczer, University of Sydney; D. Jauncey, A.
Tzioumis, J. Reynolds, and M. Wieringa, Australia Telescope
National Facility; G. Nicholson, Hartebeesthoek Radio Astronomy
Observatory; and H. Bignall, University of Adelaide, write:  "Four
days of observing in our weekly monitoring of the quasar PKS
0405-385 (z = 1.285) with the Australia Telescope Compact Array
between Nov. 25 and Dec. 2 shows that rapid, quasiperiodic flux-
density variations have reappeared in this unusual source.  Such
variations were first seen in June 1996 (IAUC 6418), lasting for
six weeks.  The present variations are smaller in amplitude than in
1996, reaching peak-to-peak values of up to 100, 180, 140, and 60
mJy at wavelengths of 3, 6, 13, and 20 cm.  The variations appear
also to be slower than in 1996, reaching a maximum of 110 mJy in 3
hr at 6 cm.  The inferred brightness temperature is about 3 x 10E19
K if the variability is intrinsic to the source.  PKS 0405-385
shows again the most rapid radio variability yet found."


COMET C/1998 U5 (LINEAR)
     K. Dennerl, J. Englhauser, and J. Trumper, Max-Planck-Institut
fur Extraterrestrische Physik, Garching; and C. Lisse, University
of Maryland, communicate:  "Comet C/1998 U5 (cf. IAUC 7059) was
observed with the ROSAT Position Sensitive Proportional Counter
(PSPC) on Dec. 8-9.  Quicklook data show a clear detection of the
comet at soft x-rays (E < 1 keV).  For an investigation of the
x-ray emission process, observations at other wavelengths are
encouraged.  Particularly valuable would be estimates of the gas-
and dust-production rates."

                      (C) Copyright 1998 CBAT
1998 December 10               (7066)            Daniel W. E. Green

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