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IAUC 5822: HD 173637; 1993J; 1993e

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                                                  Circular No. 5822
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)


HD 173637
     A. J. Landolt, Louisiana State University, writes:  "The star
HD 173637 has been classified as a B0e star with an 'almost continuous
spectrum' (Neubauer 1943, Ap.J. 97, 300) and as B1 IV (Morgan
et al. 1955, Ap.J. Suppl. 2, 41).  Insofar as is known, the star
has been constant over many years, and has been used successfully
as a photometric standard star (Landolt 1983, A.J. 88, 439).  HD
173637 was found in an apparent outburst of > 0.4 mag on June 25.27
UT with the Yale 1.0-m telescope at Cerro Tololo Interamerican
Observatory. Rough quick-look magnitudes and color indices are:  V =
8.96, B-V = +0.37, U-B = -0.8."


SUPERNOVA 1993J IN NGC 3031
     R. Martin writes:  "The data taken of SN 1993J with the Isaac
Newton Group of Telescopes (INGT) and Carlsberg Automatic Meridian
Circle of the Observatorio del Roque de los Muchachos, are being
reduced at the INGT on La Palma and at the Royal Greenwich Observatory
in Cambridge.  These reduced data are being written into a
public-domain archive that is available via anonymous ftp over
Internet.  The site name for access is ftp.ast.cam.ac.uk and the
data are organised in the directories that are in the tree
/sn1993j/reduced/....  The file README gives information on the
data, instruments, telescopes, etc.  The file /sn1993j/reduced/
acknowledgements.doc gives the acknowledgement that should be used
when publishing articles based on this archived data.  Further
information on the archive can be obtained from Ralph Martin or Nic
Walton, Royal Greenwich Observatory, Madingley Road, Cambridge
CB3 0EZ, England."
     R. Pressberger and H. M. Maitzen, Institute for Astronomy,
Vienna, report further Stromgren photometry (cf. IAUC 5816), given
as before in the sense (SN 1993J - GSC 4383.0928):  June 1.89 UT, u
= +2.1, v = +1.44, b = +1.25, g1 = +0.97, g2 = +0.83, y = +0.61.


PERIODIC COMET SHOEMAKER-LEVY 9 (1993e)
     Total V magnitude estimates (cf. IAUC 5798) from H. Mikuz,
Ljubljana, Slovenia (0.20-m Baker-Schmidt camera + ST-6 CCD):  May
22.89 UT, 14.1; June 18.87, 14.1.


1993 June 25                   (5822)            Daniel W. E. Green

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