Simultaneous UV, optical and radio monitoring of the BL Lac object OJ 287 in March 1993

E. Pian, R. A. Edelson, S. J. Wagner, J. Bregman, I. George, A. Treves, W. Wamsteker, H. Bock, M. Carini, T. Courvoisier, M. Donahue, Y. Efimov, A. Filippenko, H. H. Fink, J. Heidt, A. Lawrence, L. Maraschi, H. R. Miller, G. Pike, A. QuirrenbachN. Shakhovskoy, A. Sillanpåå, M. Sitko, P. Smith, L. Takalo, H. Teråsranta, E. Valtaoja, M. Ward, R. Warwick

Research output: Contribution to journalArticlepeer-review


The BL Lacertae object OJ 287 was intensively monitored with the IUE satellite from 1993 March 15 to 20 in the 2000-3000 A wavelength region. The very low emission state of the source hampered the detection during part of the 23 performed exposures. The light curve at 2650 A constructed with the 11 best images exhibits a variable trend with a factor is less than or approximately 2 enhancement of the flux in about 3 hours. Simultaneous ground based observations show an optical flux variability of smaller amplitude, but correlated with the UV light curve without any apparent lag. The radio light curve is nearly constant. The UV emission state is the weakest observed in 15 years for this flaring blazard, being a factor of less than or approximately 20 lower than the maximum recorded one.
Original languageEnglish
Pages (from-to)57-60
JournalNatural hazards and oceanographic processes from satellite data
Publication statusPublished - 1 Aug 1995


  • Bl Lacertae Objects
  • Light Emission
  • Radio Astronomy
  • Radio Sources (Astronomy)
  • Ultraviolet Astronomy
  • Emission Spectra
  • Iue
  • Light Curve
  • Time Lag


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