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IAUC 6493: DO Dra; C/1995 O1; C/1996 Q1

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                                                  Circular No. 6493
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
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)
Phone 617-495-7244/7440/7444 (for emergency use only)


DO DRACONIS
     J. A. Mattei, AAVSO, reports that this cataclysmic variable is
in outburst, as indicated by the following magnitude estimates
(visual unless otherwise noted):  Oct. 15.766 UT, [14.3 (G. Poyner,
Birmingham, England); 15.824, [12.4 (M. Gill, Solihull, England);
16.784, 12.7 (Poyner); 16.787, 12.0 (T. Vanmunster, Landen, Belgium;
CCD); 16.956, 11.1 (Gill).  The last two outbursts of this dwarf
nova, which lasted five days each, were in 1988 Mar. (cf. IAUC
4574) and 1990 Sept. (IAUC 5101), when the star reached magnitudes
10.1 and 9.7 at maximum, respectively.


COMET C/1995 O1 (HALE-BOPP)
     H. Kawakita, Osaka; M. Fujii, Okayama; and J. Watanabe,
National Astronomical Observatory of Japan, report their detection
of NH2 emission features on Oct. 3.43 UT with an 0.28-m telescope
with a spectrograph having resolution about 1.2 nm (slit size 424"
x 7").  From observations of [O I] at 630 nm, and based on Haser's
model (using the typical scale lengths of NH2), the production-rate
ratio Q(NH2)/Q(H2O) = 0.1.


COMET C/1996 Q1 (TABUR)
     Extension to ephemeris on IAUC 6479 (elements MPC 27882):

1996 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct. 14    11 38.23   +55 49.5   0.459   0.923   67.2   85.4    5.5
     19    13 14.17   +52 31.1   0.534   0.889   62.7   85.0    5.6
     24    14 11.15   +47 18.1   0.630   0.863   59.2   82.0    5.9
     29    14 44.86   +42 20.6   0.736   0.846   56.3   77.4    6.1
Nov.  3    15 06.22   +38 03.1   0.846   0.840   53.7   72.1    6.4
      8    15 20.76   +34 22.4   0.955   0.844   51.4   66.5    6.7
     13    15 31.30   +31 10.7   1.061   0.859   49.3   61.0    7.0
     18    15 39.37   +28 22.1   1.162   0.883   47.6   55.8    7.3
     23    15 45.83   +25 52.0   1.255   0.915   46.3   51.3    7.6
     28    15 51.21   +23 37.4   1.340   0.955   45.4   47.3    7.9
Dec.  3    15 55.85   +21 36.3   1.417   1.001   44.9   44.1    8.3
      8    15 59.91   +19 47.1   1.486   1.052   45.0   41.4    8.6
     13    16 03.51   +18 08.7   1.545   1.107   45.5   39.4    8.9

                      (C) Copyright 1996 CBAT
1996 October 17                (6493)            Daniel W. E. Green

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