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IAUC 7475: 2000db; C/1999 S4

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                                                  Circular No. 7475
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  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 2000db IN NGC 3949
     S. Nakano, Sumoto, Japan, reports the discovery by M. Aoki,
Tsukioka, Toyama, of an apparent supernova (mag 14.3) on a CCD
image taken Aug. 6.498 UT and confirmed on six unfiltered CCD
frames taken Aug. 7.444 (limiting mag 18.5), using an 0.43-m f/6
reflector + CCD and an automated supernova survey system developed
by Aoki.  The supernova is located at R.A. = 11h53m39s.75, Decl. =
+47o51'46".6 (equinox 2000), which is 20" northwest of the center
of NGC 3949.  No star is present at this location on Aoki's 19
frames taken between 1996 and May 2000.


COMET C/1999 S4 (LINEAR)
     D. Schleicher and L. Woodney, Lowell Observatory, write:  "We
used the Hall 1.1-m telescope (+ 95"-diameter aperture) at Lowell
Observatory to obtain narrowband photometry of comet C/1999 S4
(centered at the nominal ephemeris position; cf. MPEC 2000-O02),
yielding the following production rates:  log Q(OH) = 27.4; log
Q(CN) = 24.4; log Af(rho) = 1.5 (cf. IAUC 7342).  The equivalent
log Q (water; vectorial) is 27.6.  The values are 8-10 times
less than those measured on July 13 (cf. IAUC 7455)."
     Though necessarily uncertain, the following ephemeris
extension to IAUC 7455 (from elements on MPC 40988) is given as a
finding aid.

2000 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase
Aug. 14    12 35.59   - 7 21.5   1.009   0.848   49.6   65.5
     16    12 37.17   - 8 48.8   1.081   0.866   48.7   61.5
     18    12 38.48   -10 04.6   1.152   0.884   47.7   57.8
     20    12 39.57   -11 11.0   1.222   0.904   46.5   54.4
     22    12 40.49   -12 09.8   1.291   0.924   45.3   51.1
     24    12 41.30   -13 02.4   1.359   0.945   44.1   48.0

     28    12 42.64   -14 32.8   1.490   0.991   41.4   42.4
Sept. 1    12 43.76   -15 48.7   1.615   1.039   38.6   37.3
      5    12 44.76   -16 54.2   1.733   1.088   35.8   32.8
      9    12 45.70   -17 52.2   1.845   1.140   32.9   28.7
     13    12 46.61   -18 44.6   1.951   1.193   30.1   25.1
     17    12 47.52   -19 32.9   2.049   1.247   27.4   21.8
     21    12 48.42   -20 18.1   2.141   1.301   24.9   18.9
     25    12 49.33   -21 01.1   2.227   1.356   22.5   16.4
     29    12 50.24   -21 42.5   2.306   1.411   20.4   14.3
Oct.  3    12 51.14   -22 22.6   2.379   1.467   18.7   12.6

                      (C) Copyright 2000 CBAT
2000 August 7                  (7475)           Elizabeth O. Waagen

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