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IAUC 4369: 1987l; 1987A

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IAUC number 

                                                  Circular No. 4369
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


PERIODIC COMET REINMUTH 2 (1987l)
     J. Gibson reports his recovery of this comet with the 1.5-m
reflector at Palomar, as shown below.  The comet appears nearly
stellar through a Gunn r filter and is close to the predicted
position on MPC 11354 (elements on MPC 10522).

       1987 UT            R. A.   (1950)   Decl.      m2
       Apr. 11.48542    19 40 16.88    -24 56 19.0    19
            11.48958    19 40 17.26    -24 56 17.9
            11.49410    19 40 17.60    -24 56 16.8
            13.46933    19 43 04.70    -24 48 09.3
            13.47792    19 43 05.45    -24 48 07.3
            13.48306    19 43 05.87    -24 48 05.5


SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
     N. Suntzeff and M. Hamuy, Cerro Tololo Interamerican Observatory,
report:  "Our nightly photoelectric observations at CTIO in
the Cousins UBVRI system show that SN 1987A has begun to brighten
in U.  Since Mar. 26 (through Apr. 19), the SN has brightened in
BVRI by 0.029 mag/day in a remarkably linear fashion.  Beginning
about Apr. 15, U has brightened by about 0.03 mag/day.  From published
infrared colors and measurements taken at CTIO, the SN has been
increasing in bolometric luminosity by 2.8 percent/day since one week
after outburst.  On Apr. 19.0 UT, we observed the following colors:
V = 3.30, B-V = +1.65, U-B = +2.65, V-R = +0.70, R-I = +0.27."
     P. Meikle, Imperial College, London, telexes:  "S. Matcher, B.
Morgan, and I carried out speckle interferometric observations of
SN 1987A using the Imperial College speckle interferometer at the
Anglo-Australian Telescope on Apr. 2.41-2.48 UT.  Filter passbands
were 1.5 nm, centered on 386.9 and 486.1 (H-beta) nm.  Preliminary data
reduction indicates that the SN was unresolved at either wavelength,
implying angular radii of < about 0".012 and 0".015, respectively.
The corresponding limits on the linear radius are 9 x 10E13 and
11 x 10E13 m, respectively (d_LMC = 50 kpc), consistent with the
radii implied by spectroscopically derived velocities."
     Provisional photometry by A. Beresford, Adelaide, South
Australia (20-cm reflector):  Apr. 17.4 UT, V = 3.24, B-V = +1.69;
18.44, 3.19, +1.67; 20.46, 3.15, +1.62.  Corrigendum: On IAUC 4366,
the magnitude estimate by M. Morel should read  3.4.


1987 April 21                  (4369)            Daniel W. E. Green

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