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IAUC 7777: P/2001 X2; 2001ig; DK Lac

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IAUC number

                                                  Circular No. 7777
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     Additional astrometry and the following extremely uncertain
orbital elements appear on MPEC 2001-Y14:

     T = 2002 Aug. 10.311 TT          Peri. =   7.808
     e = 0.47686                      Node  = 183.124   2000.0
     q = 1.95226 AU                   Incl. =   2.334
       a =  3.73181 AU     n = 0.136718     P =   7.21 years

SUPERNOVA 2001ig IN NGC 7424
     S. Ryder and K. Kranz, Anglo-Australian Observatory; E.
Sadler, University of Sydney; and R. Subrahmanyan, Australia
Telescope National Facility, write:  "We have searched for the
radio counterpart to SN 2001ig with the Australia Telescope Compact
Array on Dec. 15.3-15.6 UT.  A source was detected in an 8640-MHz
image at R.A. = 22h57m30s.74, Decl. = -41o02'26".1 (equinox 2000.0)
with a flux of 2.2 +/- 0.3 mJy.  No source was detected at 4790 MHz
above a level of 0.9 mJy, implying a spectral index > 1.5.  The
source was also observed on Dec. 18.1-18.2, by which time the flux
at 8640 MHz had doubled, and a marginal detection at 4790 MHz of
0.9 mJy was obtained.  Continued monitoring at these and other
frequencies is planned in coming weeks."

     A. Henden, USRA and U.S. Naval Observatory (USNO); and E.
Freeland and K. Honeycutt, Indiana University, write:  "Regular
monitoring since 1990 of DK Lac (N Lac 1950) with Indiana's
RoboScope shows this cataclysmic variable to have been stable near
V = 16.8 until a slow decline began during Sept. 2000.  By Jan.
2001, the system had largely faded below the RoboScope detection
magnitude limit of 17.5-18.5.  Exposures on Dec. 15 UT with the
WIYN 0.91-m telescope at Kitt Peak, and on Dec. 17 with the 1.0-m
telescope at USNO/Flagstaff, show the system near V = 19.4 with
B-V = -0.2.  There is a red companion (mag 19.5) located 5" to the
east.  VY Scl-type low states such as these provide an opportunity
to study the white dwarf while the accretion luminosity is reduced
or absent."

                      (C) Copyright 2001 CBAT
2001 December 19               (7777)            Daniel W. E. Green

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