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We have proposed observations of the bright quasar 3C 273 using IUE and EUVE
as part of a large multifrequency and monitoring campaign using IUE, EUVE, ROSAT,
ASCA, CGRO, OSSE, COMPTEL and EGRET as well as a number of ground-based
telescopes including the Ohio State and VLA observatories. Observations are to be
carried out over an eight-month interval spanning late Dec. 93- Aug. 94. UV target of
opportunity observations of 3C 279 are also proposed if this blazar begins to brighten
during the observing program. Multifrequency observations are crucial in providing
model constraints for quasars, particularly for sources such as blazars where contributions from both jets and accretion disks are expected. For 3C 273, IUE and EUVE observations fall within an important part of the overall electromagnetic spectrum. In this talk we present
some preliminary work (mainly from previous multifrequency campaigns) that impose constraints on thermal disk components and synchrotron/self-compton parameters for 3C 273.
