Central Bureau for Astronomical Telegrams
IAUC 7742: 2001fd; 2001fe; 2001 SL_9
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Circular No. 7742
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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SUPERNOVA 2001fd IN UGC 11957
M. Papenkova and W. D. Li, University of California at
Berkeley, report the discovery by LOTOSS (cf. IAUC 7514) of an
apparent supernova (mag about 18.4) in unfiltered images taken with
the Katzman Automatic Imaging Telescope (KAIT) on Nov. 1.2 and 2.2
UT. SN 2001fd is located at R.A. = 22h14m29s.64, Decl. =
+5 01'37".6 (equinox 2000.0), which is 8".3 east and 15".9 south of
the nucleus of UGC 11957. A KAIT image taken on Oct. 26.2 showed
nothing at this position (limiting mag about 19.0).
SUPERNOVA 2001fe IN UGC 5129
G. M. Hurst, Basingstoke, England, reports the discovery of an
apparent supernova (mag 16.0) by M. Armstrong, Rolvenden, England
on unfiltered CCD images taken on Nov. 2.23 and 3.08 UT in the
course of the U.K. Nova/Supernova Patrol, showing the new object at
R.A. = 9h37m57s.10, Decl. = +25o29'41".3 (equinox 2000.0), which is
15" west and 1" south of the center of UGC 5129. An unfiltered CCD
image taken by T. Boles, Coddenham, England, on Nov. 3.135 yields
position end figures 57s.03, 41".7 (and offsets 13".5 west, 0".1
south). Nothing was present at this location on an image taken by
Armstrong on 2000 Nov. 4 (limiting mag 19.0) or on second Palomar
Sky Survey images taken on 1995 May 19 (limiting blue mag 22.5) and
1998 Apr. 23 (limiting red mag 20.5).
2001 SL_9
P. Pravec and P. Kusnirak, Ondrejov Observatory; and B. Warner,
Palmer Divide, CO, write: "Our photometric observations of this
Apollo-type object (cf. MPEC 2001-S16, MPO 18074) on ten nights
during Oct. 11.0-21.3 UT reveal a lightcurve that appears to be a
co-addition of two components of different periods: 16.40 +/- 0.02
hr (with amplitude 0.10 mag, showing two sharp, narrow minima and
little or no variation at phases between them) and 2.4003 +/-
0.0003 hr (with amplitude 0.08 mag and most of the signal in the
second and fourth harmonics). The lightcurve character indicates
that 2001 SL_9 is a binary system with the long period being a
mutual orbital period (the sharp minima being occultation + eclipse
events between the binary components), the short period being a
rotation period of the primary, and a secondary-to-primary diameter
ratio of 0.31 with formal error 0.02 (see Pravec et al. 2000,
Icarus 146, 190). Follow-up observations are desirable."
(C) Copyright 2001 CBAT
2001 November 3 (7742) Daniel W. E. Green
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