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IAUC 4586: 1988f; (2060); N Oph 1988

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IAUC number 

                                                  Circular No. 4586
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 617-495-7244/7440/7444
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


PERIODIC COMET FINLAY (1988f)
     A. C. Gilmore and P. M. Kilmartin, Mount John Observatory, report
that they have recovered this comet as follows:

     1988 UT             R.A. (1950) Decl.       m2
     Apr. 21.72515   23 26 21.61   - 6 21 31.6   17
          21.74367   23 26 25.75   - 6 21 03.1
          22.72156   23 30 06.32   - 5 57 01.8   17
          22.74066   23 30 10.83   - 5 56 35.8

The object is diffuse, without condensation, and in very close
agreement with the prediction on MPC 12812 (elements on MPC 11519).


(2060) CHIRON
     A. L. Cochran, University of Texas, communicates: "Spectroscopic
observations (range 350-650 nm) of (2060) Chiron were obtained on Mar.
19 by E. Barker using the IDS spectrograph on the 2.7-m telescope at
the McDonald Observatory.  The reductions were performed by S. Sawyer
and A. Cochran.  The aperture projected to 36 588 km**2 at the distance
of Chiron.  No emissions were detected.  The 2-sigma upper limits for
the column densities of the molecules CN, C3 and C2 (delta v = 0) were
7.37, 9.73 and 5.97 x 10**9, respectively.  Because of the large
heliocentric distance, these column densities do not give very tight
upper limits for gaseous production.  The logarithms of the production
rates (molecules/s) are 25.51 (CN), 25.02 (C3) and 26.06 (C2)."


NOVA OPHIUCHI 1988
     Prediscovery photographic magnitude estimates by R. H.
McNaught, Siding Spring Observatory: Feb. 26.78 UT, [10.9; Mar.
24.63, 11.9: (weak images on a pair of exposures).
     P. M. Kilmartin, Mount John Observatory, reports that a blue
objective-prism spectrogram obtained by A. C. Gilmore on Apr.
24.47 UT showed strong hydrogen emission lines on a weak
continuum.  Photoelectric photometry on Apr. 23.71 UT gave V =
10.42, U-B = -0.14, B-V = +0.81, V-R = +1.19, V-I = +1.79.
     Visual magnitude estimates by McNaught: Apr. 19.50 UT, 10.0;
20.60, 10.0; 22.53, 10.1; 23.51, 10.0; 24.64, 9.8; 25.77, 9.8.


1988 April 26                  (4586)              Brian G. Marsden

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