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IAUC 3914: 1983n; 1982i; KR Aur

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IAUC number 

                                                  Circular No. 3914
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758


PERIODIC COMET CROMMELIN (1983n)
     H. Spinrad, P. Wehinger, S. Wyckoff and M. Belton obtained
spectra (range 450-790 nm, resolution ~ 1.5 nm) on Feb. 4.1 UT (r
= 0.80 AU, A = 1.14 AU) using the Kitt Peak National Observatory's
4-m telescope and cryogenic camera (800 x 800 pixel Texas Instruments
CCD detector), with the slit oriented along the comet's tail
axis (p.a. 60.4).  Emission features observed in the coma include
strong bands of C2 (Delta-v = +1, 0, -1) and NH2 (13-0 through 5-0) and
a weaker CN (2-0) band.  The emission features in the long-slit
CCD spectra were symmetrical about the coma center with no ion
features evident.  No ion tail or dust tail was seen on the 4-m-
telescope television monitor.

     Further total visual magnitude estimates: Feb. 2.00 UT, 9.6
(J. Bortle, Stormville, NY, 0.32-m reflector); 5.14. 9.2 (A. Hale,
Whitaker Peak, CA, 0.20-m reflector).


PERIODIC COMET HALLEY (1982i)
     The following precise positions have been reported:

   1983/84 UT        R.A.  (1950.0)  Decl.      m2    Observer

   Dec. 31.4558     6 29 25.33   +10 12 29.5   23.2   Racine
   Jan. 27.11715    6 13 04.91   +10 40 30.5   23     Pedersen
        27.14955    6 13 03.81   +10 40 33.1            "
        28.07907    6 12 32.46   +10 41 50.6            "
        28.19435    6 12 28.54   +10 41 59.8            "
        29.10002    6 11 58.35   +10 43 16.1            "
        29.19529    6 11 55.12   +10 43 24.4            "
        30.04962    6 11 27.00   +10 44 37.6            "
        30.07811    6 11 26.01   +10 44 40.2            "

R. Racine (Canada-France-Hawaii Observatory).  2-hr IIIa-F exposure.
   Difficulty setting on ends of overexposed star trails.
H. Pedersen and R. M. West (European Southern Observatory).  1.5-m
   Danish reflector with CCD.  Measurer: West.


KR AURIGAE
     Visual magnitude estimates by J. Bortle, Stormville, NY: 1983
Dec. 9.02 UT, 13.6; 31.06, 12.5; 1984 Jan. 2.01, 12.8; 11.01,
13.8; 22.02, 13.9; 26.05. 14.0.


1984 February 10               (3914)              Brian G. Marsden

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