Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6311: C/1996 B2

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 6310 SEARCH Read IAUC 6312

View IAUC 6311 in .dvi or .ps format.
IAUC number 

                                                  Circular No. 6311
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)
     D. Schleicher, Lowell Observatory, reports:  "Narrow-band
photometry of this comet was obtained using the Lowell Observatory
0.8-m telescope on Feb. 9.5 UT.  Haser-model production rates were:
log Q(OH) = 28.70, log Q(CN) = 26.16, and log Q(C2) = 26.15.  The
dust production rate was log (A f rho) = 3.19.  For comparison, the
water production rate (based on OH) is about 30 percent less than
we observed for 1P/Halley at a comparable heliocentric distance."
     Total-magnitude and coma-diameter estimates (cf. IAUC 6304):
Jan. 1.84 UT, 13.3, 1' (K. Takamizawa, Saku, Nagano, Japan, 0.10-m
refractor; prediscovery photographs; low altitude); Feb. 10.76, 8.7,
3' (T. Lovejoy, Jimboomba, Queensland, 0.25-m reflector; visual).
     If the Jan. 1 positions can be relied on to arcsecond accuracy,
the ephemeris uncertainty in late March is at most a few tenths of
a degree.  Improved ephemeris from orbital elements by B. G.
Marsden on MPEC 1996-C06 (minimum distance from the earth is 0.10
AU on Mar. 25):

1996 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Feb.  7    14 36.95   -24 54.8   1.592   1.914   92.9   31.0    9.3
     12    14 40.64   -24 47.6   1.424   1.831   97.1   32.3    8.9
     17    14 44.10   -24 32.4   1.256   1.746  101.4   33.7    8.4
     22    14 47.28   -24 05.8   1.088   1.659  105.9   35.0    7.9
     27    14 50.11   -23 22.1   0.920   1.570  110.5   36.2    7.3
Mar.  3    14 52.52   -22 10.5   0.753   1.479  115.4   37.3    6.6
      8    14 54.36   -20 08.7   0.586   1.386  120.6   38.0    5.8
     13    14 55.36   -16 20.7   0.422   1.291  126.6   38.2    4.7
     18    14 54.70   - 7 39.0   0.263   1.192  133.6   37.2    3.4
     23    14 48.03   +22 34.8   0.127   1.090  134.8   40.4    1.4
     28     4 05.6    +78 49.1   0.135   0.985   80.5   91.7    1.1
Apr.  2     3 11.39   +52 00.4   0.273   0.876   55.8  109.3    2.1
      7     3 05.25   +43 28.1   0.429   0.762   45.1  111.3    2.5
     12     3 00.61   +39 02.9   0.590   0.643   37.4  108.7    2.4
     17     2 55.04   +35 47.4   0.754   0.519   30.3  102.6    2.0
     22     2 47.46   +32 29.3   0.919   0.393   23.0   90.9    1.3
     27     2 37.08   +27 59.6   1.081   0.278   14.7   67.2    0.1

                      (C) Copyright 1996 CBAT
1996 February 10               (6311)            Daniel W. E. Green

Read IAUC 6310 SEARCH Read IAUC 6312

View IAUC 6311 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!