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IAUC 5418: S Per; 1991 XB

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                                                  Circular No. 5418
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


S PERSEI
     D. Crabtree and C. Aikman, Dominion Astrophysical Observatory,
communicate: "CCD spectra of the M supergiant S Per obtained with
the 1.2-m and 1.8-m DAO telescopes between Nov. 28 and Dec. 14
indicate that this star is currently undergoing a very deep minimum.
Spectra with 0.03-nm and 0.18-nm resolution in the 850-nm region
show very strong TiO bands and very weak Ca II lines, which indicate
a spectral type of M6 or later.  A spectrum in the 770-nm region
(resolution 0.08 nm) shows a strong emission reversal in the K I
line at 769.8 nm.  There is no evidence for H alpha emission in a
spectrum with 0.03-nm resolution.  Further observations of this
star, including photometry and monitoring of the H2O and OH maser
emission, are encouraged."


1991 XB
     Precise positions measured by J. V. Scotti from images obtained
by D. Rabinowitz with the Spacewatch camera at Kitt Peak:

     1991 UT             R.A. (2000) Decl.        V
     Dec. 13.34496    4 07 30.84   +13 22 55.6   17.7
          13.35222    4 07 31.61   +13 22 32.5   17.7
          15.10460    4 11 08.55   +11 52 14.2   17.9
          15.11149    4 11 09.34   +11 51 53.5

     Orbital elements from 10 observations Dec. 1-15:

     T = 1991 Nov. 26.7998 TT         Peri. = 171.6570
     e = 0.581430                     Node  = 250.7720  2000.0
     q = 1.250397 AU                  Incl. =  16.0978
       a =  2.987310 AU    n = 0.1908902    P =   5.163 years

1991/92     R. A. (2000) Decl.     Delta      r    Elong. Phase      V
Dec. 20     4 20.75    + 8 06.2    0.321    1.279  153.7   19.9     17.6
     30     4 39.05    + 2 25.1    0.375    1.309  145.2   25.4     18.1
Jan.  9     4 56.18    - 0 53.2    0.443    1.347  138.4   29.0     18.7
     19     5 12.92    - 2 27.3    0.523    1.393  132.8   31.2     19.1
     29     5 29.65    - 2 52.9    0.614    1.445  127.9   32.5     19.6
Feb.  8     5 46.65    - 2 36.4    0.714    1.503  123.3   33.3     20.0


1991 December 27               (5418)              Brian G. Marsden

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