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IAUC 7554: 2000 WR_106; 2001A; Poss. N IN Pup

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                                                  Circular No. 7554
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


2000 WR_106
     D. Jewitt and H. Aussel, University of Hawaii, report their
measurement of submillimeter continuum radiation from 2000 WR_106
(cf. MPEC 2000-X02, 2000-Y45) using the 15-m James Clerk Maxwell
Telescope on Mauna Kea: "A preliminary estimate of the flux density
at 850 microns on 2000 Dec. 30 and 31 gives 2.5 +/- 0.8 mJy.
Simultaneous R-band optical photometry by A. Evans (SUNY at Stony
Brook) using the University of Hawaii 2.2-m telescope yields red
mag 19.7.  The submillimeter flux, interpreted as Rayleigh-Jeans
thermal emission, corresponds to an object diameter of 900 (+100,
-150) km.  The derived geometric albedo is 7 (+3, -1.5) percent.
Thus, 2000 WR_106 is about half the size of Pluto.  Its surface is,
on average, about eight times darker, suggesting the absence of
widespread surface frost."


SUPERNOVA 2001A IN NGC 4261
     M. Modjaz and W. D. Li, University of California at Berkeley;
and M. Schwartz, Cottage Grove, OR, report the discovery of an
apparent supernova (mag about 18.9) by LOTOSS (cf. IAUC 7514) on an
unfiltered image taken on Jan. 1.5 UT with the 0.8-m Katzman
Automatic Imaging Telescope (KAIT).  SN 2001A, confirmed on an
image taken on 2000 Dec. 29.5 UT (mag about 18.8) and an image
taken with the 0.5-m Tenagra III automatic telescope on Dec. 15.5
(mag about 18.4), is located at R.A. = 12h19m23s.01, Decl. =
+5 49'40".5 (equinox 2000.0), which is 3".1 west and 10".7 north of
the nucleus of NGC 4261.  The photometry and astrometry of the new
object were measured after subtracting the combined image of the
new observations from the KAIT observations in May 2000 (limiting
mag about 21.0), which showed nothing at the position of the
supernova.


POSSIBLE NOVA IN PUPPIS
     S. Nakano, Sumoto, Japan, reports the following precise
position for this variable (cf. IAUC 7552, 7553) by H. Abe (Yatsuka,
0.26-m f/6.0 reflector) from a CCD image taken on Jan. 1.525 UT:
R.A. = 7h37m56s.91, Decl. = -25o56'59".7 (equinox 2000.0).  G. Masi,
Ceccano, Italy, reports the following position end figures from an
image taken by M. Uemura (Kyoto University):  56s.91, 59".0.  Masi
notes the presence of a USNO-A2.0 catalogue star (red mag 13.2) at
position end figures 56s.88, 59".1.  T. Kato forwards position end
figures obtained by K. Kadota (Ageo, Saitama, 0.18-m f/5.5
reflector) from an image taken on Jan. 1.654:  56s.88, 58".9.

                      (C) Copyright 2001 CBAT
2001 January 2                 (7554)            Daniel W. E. Green

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