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IAUC 4322: 1987B; 1987A; NOTICE TO SUBSCRIBERS

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                                                  Circular No. 4322
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


SUPERNOVA 1987B IN NGC 5850
     R. H. McNaught, Siding Spring Observatory, provides the
following precise position, measured by him from an exposure on Feb.
27 by A. Savage with the U.K. Schmidt telescope: R.A. = 15h04m30s.56, Decl.
= +1 41'43".8 (equinox 1950.0).  The offset from the nucleus is
71" west, 145" south.  A visual magnitude estimate by T. Cragg on
Feb. 27.70 UT gave 14.4:.


SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
     Y.-H. Chu, University of Illinois, informs us that her narrow-
filter plates obtained at the CTIO 4-m prime focus in 1983 show
the additional companion (star 3) to Sanduleak -69 202 suggested
on IAUC 4321 at a separation of 1".4 (+0".1, -0".3) in p.a. 110 +/-
3 deg.  Star 3 appears to be of mag about 17.5 and not red.
     Further visual magnitude estimates by R. H. McNaught,
Coonabarabran, N.S.W.: Feb. 28.408 UT, 4.3; 28.588, 4.4.


NOTICE TO SUBSCRIBERS
     This is the first of these Circulars to be issued on a Saturday
(at least during the past 30 yr)!  Although our telegrams are
often issued at weekends and on holidays, the Circulars have not
been issued then because of the impossibility of having them
printed and mailed.  Now that a substantial number of subscribers
are obtaining the Circulars at any time via the CBAT/MPC Computer
Service, we shall henceforth issue (but not necessarily have for
mail distribution) them whenever it is appropriate.  During the
current 'crisis situation' caused by SN 1987A we have set up
Computer Service accounts at short notice for several new subscribers.
There is a monthly charge of $7.50 (regular) or $4.50 (special),
but a subscription to the printed Circulars (at the same
monthly charge) or to the Minor Planet Circulars (at double this
charge) must also be purchased.  During the past few days it has
become possible to access the Computer Service directly at 9600
baud via the SPAN network (rather than indirectly by a 300- or
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unavailable).  Users with the SPAN capability who need further
information should enquire about this when next they log in.


1987 February 28               (4322)              Brian G. Marsden

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