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IAUC 5713: alpha Ori; 1992x; 1992t

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                                                  Circular No. 5713
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


alpha ORIONIS
     A. P. Hatzes and W. D. Cochran, University of Texas at Austin,
report:  "Precise relative radial velocities of alpha Ori obtained
at McDonald Observatory, using an iodine absorption cell, indicate
that this star has exhibited a slow decline in its radial velocity
by about 6 km/s from 1991 April to 1992 November.  Between 1992
Nov. 12 and 1993 Feb. 2, the radial velocity underwent a rapid
increase of about 3 km/s, coinciding with the decrease in brightness
for the star reported by Guinan et al. on IAUC 5708."


PERIODIC COMET SCHAUMASSE (1992x)
     Extension to ephemeris on IAUC 5666:

1993 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Mar.  4     5 18.38   +45 08.1   0.556   1.202   98.0   54.8    8.4
      9     5 43.24   +46 21.7   0.561   1.204   97.7   54.8    8.5
     14     6 10.44   +47 11.2   0.568   1.209   97.7   54.6    8.5
     19     6 39.42   +47 32.3   0.577   1.218   98.0   54.0    8.6
     24     7 09.43   +47 21.8   0.589   1.231   98.5   53.2    8.7
     29     7 39.56   +46 38.9   0.603   1.246   99.2   52.3    8.8
Apr.  3     8 08.95   +45 24.9   0.621   1.265  100.0   51.1    9.0
      8     8 36.90   +43 43.3   0.642   1.286  100.8   49.9    9.2
     13     9 02.96   +41 38.7   0.667   1.310  101.5   48.6    9.4
     18     9 26.93   +39 16.5   0.696   1.337  102.2   47.2    9.6
     23     9 48.82   +36 42.1   0.730   1.366  102.7   45.9    9.8
     28    10 08.76   +34 00.4   0.767   1.397  103.0   44.6   10.1
May   3    10 26.93   +31 15.6   0.809   1.429  103.2   43.4   10.4

     Total visual magnitude estimates: Feb. 10.15 UT, 8.5 (A. Hale,
Las Cruces, NM, 0.41-m reflector); 15.92, 8.4 (J.-C. Merlin, Le
Creusot, France, 0.40-m reflector); 19.87, 8.4 (H. Luthen, Hamburg,
Germany, 0.20-m reflector); 24.14, 9.3 (C. E. Spratt, Victoria, BC,
0.20-m reflector).


PERIODIC COMET SWIFT-TUTTLE (1992t)
     Total visual magnitude estimates:  Feb. 17.69 UT, 9.1 (A.
Jones, Nelson, New Zealand, 0.32-m reflector); 18.69, 9.4 (Jones);
19.81, 9.3 (D. A. J. Seargent, The Entrance, N.S.W., Australia,
25x100 binoculars); 23.75, 9.5 (P. Camilleri, Cobram, Vic.,
Australia, 20x80 binoculars).


1993 February 24               (5713)            Daniel W. E. Green

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