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IAUC 5118: IRAS 18508-7815; 1990 SM

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                                                  Circular No. 5118
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


IRAS 18508-7815
     S. L. Lipari, Space Telescope Science Institute, reports:  "I
have discovered a new extreme Fe II emission quasistellar object
(QSO) during a search at CASLEO Observatory, San Juan, for new
southern warm IRAS active galactic nuclei.  The optical spectrum
of this object is dominated by extremely strong Fe II emission and
also by the H II, He I, and [O III] lines, which are swamped by
the Fe II multiplets.  There are only two other quasars in the
literature with comparable 'superstrong' Fe II emission:  PHL 1092
(Bergeron and Kunth 1980, A.Ap. 85, L11) and IRAS 07598+6508
(Lawrence et al. 1989, M.N.R.A.S. 235, 261).  The two IRAS quasars
07598+6508 and 18508-7815 show a remarkable similarity in their
optical spectral and far-infrared characteristics (they also have
similar redshift).  IRAS 18508-7815 gives further support to the
suggestion by Lawrence et al. on the existence of a small class of
superstrong Fe II emitters."


1990 SM
     Observations by D. J. Tholen at Mauna Kea, using the
2.24-m telescope encoders:

     1990 UT             R.A. (1950) Decl.        V
     Oct. 15.28664   22 29 01.05   -31 25 21.0   17.5
          15.37411   22 29 11.75   -31 22 41.9   17.5

     Orbital elements by B. G. Marsden, Center for Astrophysics,
 from 7 observations Sept. 22-Oct. 15:

     T = 1990 July 31.467 ET          Peri. = 105.877
     e = 0.77509                      Node  = 137.334   1950.0
     q = 0.48510 AU                   Incl. =  11.568
       a =  2.15687 AU     n = 0.311148     P =   3.17 years

     1990 ET      R.A. (1950) Decl.     Delta      r       V
     Oct. 16    22 30.52    -31 03.9    0.594    1.413    17.4
          26    22 48.19    -26 51.7
     Nov.  5    23 02.39    -23 34.4    0.969    1.650    18.7
          15    23 15.19    -20 47.5
          25    23 27.49    -18 18.9    1.378    1.866    19.7


1990 October 16                (5118)             Daniel W. E. Green

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