COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                     Number 3129



                                    Konkoly Observatory
                                    Budapest
                                    11 January 1988

                                    HU ISSN 0374-0676


           PHOTOELECTRIC OBSERVATIONS OF SN 1987A


   SN LMC 1987A was monitored photoelectrically at two independent,
New Zealand observatories from February 1987 to September 1987.
   West Melton Observatory, Christchurch, uses a 36 cm cassegrain reflector,
an uncooled 9502 S/A end-window photomultiplier, a current-to-frequency 
converter and 3x10 second integrations, using a 45 arcsecond sky aperture.
   Johnson U,B and V filters are used and the system is standardised against
Cousins E-Region standards from which transformation coefficients are derived
to correct the system spectral response.



                            [FIGURE 1]


  Adams Lane Observatory, Blenheim, uses a 30 cm. cassegrain reflector,
an uncooled EMI 9789 QB, end-window photomultiplier, a current-to-frequency
converter and 3x10 second integrations with standardised U,B, and V filters
and 60 arcsecond sky aperture.
   
   Both observatories used Theta Doradus (V=4.82, B-V =1.28, U-B =1.38) as
primary comparison star for differential photometry measurements.
  
  The results have been combined in Figure 1. Agreement is good in V with
systematic but consistent differences (0.08 magnitude) apparent in B-V.




                         CLIVE ROWE

                    Joyce Memorial Observatory,
                    West Melton, Christchurch,
                    New Zealand



                         BILL ALLEN

                    Adams Lane Observatory,
                    Blenheim,
                    New Zealand