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IAUC 5120: 1990 UA; 1990ad

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IAUC number 

                                                  Circular No. 5120
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


1990 UA
     E. F. Helin reports her discovery, using the Palomar 0.46-m
Schmidt telescope, of a fast-moving asteroidal object on films
taken by herself, B. Roman, and K. Lawrence.  The following
measurements are by Roman:

     1990 UT             R.A. (1950) Decl.       Mag.
     Oct. 16.26545    1 24 58.76   - 9 58 33.9
          17.34323    1 26 29.52   - 7 16 50.3
          19.22083    1 28 27.60   - 3 58 24.3   16.2

     The following preliminary orbital elements by G. V. Williams,
Center for Astrophysics, suggest that Delta(min) = 0.02 AU around
Oct. 10:

     T = 1990 Aug. 25.040 ET          Peri. = 203.555
     e = 0.55400                      Node  = 102.378   1950.0
     q = 0.76929 AU                   Incl. =   0.970
       a =  1.72487 AU     n = 0.435082     P =   2.27 years

     1990 ET      R.A. (1950) Decl.     Delta      r       V
     Oct.  8    14 22.80    -56 23.8    0.026    0.984    17.2
          10    22 44.6     -77 25.0
          12     1 04.33    -38 09.6    0.026    1.017    13.6
          14     1 19.02    -19 25.7
          16     1 24.46    -10 44.6    0.056    1.050    14.7
          18     1 27.27    - 5 56.6
          20     1 28.99    - 2 55.6    0.090    1.084    15.6
          22     1 30.16    - 0 51.4
          24     1 31.04    + 0 39.3    0.126    1.119    16.3
          26     1 31.75    + 1 48.8
          28     1 32.38    + 2 44.1    0.163    1.153    17.0
          30     1 32.96    + 3 29.4
     Nov.  1     1 33.52    + 4 07.4    0.202    1.188    17.6


SUPERNOVA 1990ad IN ANONYMOUS GALAXY
     M. Della Valle, European Southern Observatory, reports:  "
Preliminary inspection of a low-resolution spectrum (range 360-700 nm),
obtained on Oct. 15.1 UT with the La Silla 3.6-m telescope,
yields a featureless continuum, suggesting that this is probably a
type-II SN at an early stage."


1990 October 19                (5120)             Daniel W. E. Green

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