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IAUC 5694: 1993a; HR 2538 AND HR 2787; TIME ADJUSTMENT ON 1993 JUNE 30

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                                                  Circular No. 5694
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)


COMET MUELLER (1993a)
     Orbital elements from MPC 21533, computed using a 1992 Nov. 26
Catalina prediscovery observation by T. Spahr and C. Hergenrother:

     T = 1994 Jan. 13.3034 TT         Peri. = 130.7276
                                      Node  = 144.7107  2000.0
     q = 1.937118 AU                  Incl. = 124.8670

1993 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Jan. 13     9 32.64   +49 51.9   3.650   4.482  143.9    7.4   13.8
     23     9 15.24   +52 23.6   3.549   4.395  145.5    7.3   13.7
Feb.  2     8 54.23   +54 34.8   3.487   4.309  142.2    8.1   13.6
     12     8 30.70   +56 15.5   3.463   4.222  135.3    9.5   13.5
     22     8 06.40   +57 20.5   3.472   4.134  126.2   11.1   13.4
Mar.  4     7 43.39   +57 50.5   3.509   4.047  116.3   12.7   13.3
     14     7 23.36   +57 52.2   3.567   3.960  106.1   14.0   13.2
     24     7 07.26   +57 34.3   3.637   3.872   96.1   14.8   13.2
Apr.  3     6 55.36   +57 05.5   3.713   3.785   86.4   15.3   13.1
     13     6 47.40   +56 33.1   3.788   3.698   77.2   15.3   13.1
     23     6 42.93   +56 02.0   3.855   3.610   68.5   15.0   13.0
May   3     6 41.44   +55 35.4   3.910   3.523   60.4   14.4   12.9
     13     6 42.41   +55 15.4   3.948   3.437   53.0   13.6   12.8


HR 2538 AND HR 2787
     G. Wallerstein, University of Washington, reports that an
echelle spectrogram taken with the Cerro Tololo Interamerican
Observatory 4-m reflector by D. Geisler and himself shows the Be
stars HR 2538 and HR 2787 as now exhibiting very strong emission at
H-alpha, the Paschen lines, and O I at 844.6 nm, indicating that
these stars are in a very active stage.


TIME ADJUSTMENT ON 1993 JUNE 30
     Bulletin C5 of the International Earth Rotation Service
announces that a positive leap second will be introduced such that
the sequence of UTC second markers will be: 1993 June 30d23h59m59s,
30d23h59m60s, July 1d00h00m00s.  Beginning 1993 July 1, the
difference UTC-TAI = -28s.


1993 January 21                (5694)            Daniel W. E. Green

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