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IAUC 6306: C/1996 B2; C/1996 B1

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                                                  Circular No. 6306
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)


COMET C/1996 B2 (HYAKUTAKE)
     T. Zwitter and H. Mikuz, University of Ljubljana; and U.
Munari and M. Rejkuba, Asiago Observatory, communicate:  "A
spectrogram (range 340-910 nm) of C/1996 B2 was obtained at the
European Southern Observatory's 1.5-m telescope (+ Boller & Chivens
spectrograph + CCD) on Feb. 8.2 UT.  The slit (width 2", length
14") was positioned on the comet nucleus.  The reflected solar
spectrum accounts for the vast majority of the recorded flux, with
all major absorption lines markedly visible.  The strongest
cometary emission is from CN(0,0) at 388 nm, followed by the C3
complex at 405 nm.  The strongest C2 Swan band is that of (0,0) at
516 nm, followed by that of (1,0) at 474 nm, with that of (2,0) at
438 nm being barely detectable.  The CN(0,1) 422-nm band is in
moderate emission, while no cometary NaI D emission is observed."
     Corrigendum.  On IAUC 6303, T. Kojima was using a 0.25-m f/6.0
reflector.


COMET C/1996 B1 (SZCZEPANSKI)
     Ephemeris from orbital elements on MPEC 1996-C02:

1996 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Feb.  7    13 25.41   +51 15.3   0.681   1.451  119.9   36.1    8.3
     12    12 58.54   +49 04.5   0.630   1.452  126.4   33.1    8.1
     17    12 28.30   +45 54.6   0.587   1.458  134.0   29.2    8.0
     22    11 56.43   +41 30.8   0.553   1.466  142.3   24.4    7.9
     27    11 25.19   +35 50.7   0.533   1.478  150.7   19.1    7.8
Mar.  3    10 56.64   +29 10.7   0.528   1.493  157.6   14.7    7.9
      8    10 32.04   +22 04.1   0.541   1.512  159.9   13.1    8.0
     13    10 11.82   +15 08.2   0.570   1.533  156.5   15.0    8.1
     18     9 55.82   + 8 50.7   0.613   1.557  150.1   18.6    8.4
     23     9 43.57   + 3 24.4   0.669   1.584  143.2   22.2    8.6
     28     9 34.52   - 1 09.9   0.735   1.613  136.6   25.2    8.9
Apr.  2     9 28.12   - 4 57.8   0.808   1.645  130.6   27.5    9.2
      7     9 23.90   - 8 07.1   0.887   1.678  125.3   29.1    9.5

     Total visual magnitude estimates:  Feb. 1.17 UT, 9.0 (K.
Hornoch, Lelekovice, Czech Republic, 0.35-m reflector, coma
diameter 4'.5); 1.19, 8.4 (A. Diepvens, Balen, Belgium, 0.15-m
refractor); 2.19, 9.0 (Hornoch).

                      (C) Copyright 1996 CBAT
1996 February 9                (6306)            Daniel W. E. Green

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