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IAUC 4576: 1987A; 1988d

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                                                  Circular No. 4576
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


SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
     H. Moseley, E. Dwek, W. Glaccum, J. Graham, R. Loewenstein and R.
Silverberg report spectroscopic observations of the 17.93-micrometer
line of [Fe II] in SN 1987A with velocity resolution of about 1100
km/s.  The observations were made on Mar. 28 using the Goddard
24-channel cryogenic grating spectrometer aboard the Kuiper Airborne
Observatory.  The shape of this line is important since it provides
information about the velocity distribution of the products of
nucleosynthesis in the mantle of the supernova and hence on the
degree of mixing in the ejecta.  A gaussian fit to the observations of
the line yielded a line width of 3300 +/- 1000 km/s FWHM.  The flux
density of the resolved line at line center is 70 Jy.  There is
evidence for a small amount of high-velocity material on the
blueshifted side of the line with a velocity of about 3500 km/s with
respect to the line center.  (The corresponding velocity on the
redshifted side was not observed at this time.)  This shoulder was
detected at the 3-sigma level, and its strength is about 15 percent of
the line center flux.  This velocity is higher than the approximately
2000 km/s minimum velocity of hydrogen in the outflow, suggesting
mixing of radioactive mantle material with the envelope.


PERIODIC COMET HARTLEY 3 (1988d)
     Improved orbital elements from MPC 12953:

     T = 1987 July 14.141 ET          Peri. = 167.483
     e = 0.32133                      Node  = 287.321   1950.0
     q = 2.44906 AU                   Incl. =  11.730
       a =  3.60859 AU     n = 0.143780     P =   6.85 years

     1988 ET      R.A. (1950) Decl.     Delta      r       m1
     Mar. 30     9 48.30    - 1 12.0
     Apr.  9     9 47.13    - 0 46.3    2.183    2.921    17.4
          19     9 48.21    - 0 28.4
          29     9 51.40    - 0 19.9    2.463    2.979    17.7
     May   9     9 56.41    - 0 21.3
          19    10 03.00    - 0 32.7    2.776    3.039    18.0
          29    10 10.91    - 0 53.8
     June  8    10 19.90    - 1 23.9    3.099    3.100    18.4


1988 April 4                   (4576)              Brian G. Marsden

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