List of Astronomy Acronyms - U

U

  • UARS – (spacecraft) Upper Atmosphere Research Satellite, a satellite used to study the Earth's upper atmosphere
  • UCAC – (catalog) USNO CCD Astrometric Catalog
  • UESAC – (observing program) Uppsala-ESO Survey of Asteroids and Comets
  • UFO – (astrophysics terminology) Unidentified Flying Object
  • UG – (celestial object) U Geminorum, a class of cataclysmic variable stars (also known as dwarf novae) that are named after U Geminorum, the archetype for the class
    • UGSS – (celestial object) UG SS Cygni, a subclass of UG-type stars named after SS Cygni, the archetype for the subclass
    • UGSU – (celestial object) UG SU Ursae Majoris, a subclass of UG-type stars named after SU Ursae Majoris, the archetype for the subclass
    • UGWZ – (celestial object) UG WZ Sagittae, a subclass of UG-type stars named after WZ Sagittae, the archetype for the subclass
    • UGZ – (celestial object) UG Z Camelopardalis, a subclass of UG-type stars named after Z Camelopardalis, the archetype for the subclass
  • UGC – (catalog) Uppsala General Catalogue, a catalog of galaxies
  • UIT – (telescope) Ultraviolet Imaging Telescope, an ultraviolet telescope that was operated from the cargo bay of the Space Shuttle
  • UKIDSS – (observing program/catalog) UKIRT Infrared Deep Sky Survey
  • UKIRT – (telescope) United Kingdom Infrared Telescope
  • UKSA – (organization) UK Space Agency
  • UKST – (telescope) United Kingdom Schmidt Telescope
  • ULIRG – (celestial object) UltraLuminous InfraRed Galaxy, a galaxy that is brighter than 1012 solar luminosities in the infrared
  • ULX – (celestial object) UltraLuminous X-ray source
  • UMS – (celestial object) Upper Main Sequence, the more massive hydrogen-burning main-sequence stars
  • USAF – (organization) United States Air Force
  • USGS – (organization) United States Geological Survey
  • USNO – (organization) United States Naval Observatory
  • UT – (astrophysics terminology) Universal Time
  • UTC – (astrophysics terminology) Coordinated Universal Time
  • UV – (astrophysics terminology) UltraViolet
  • UVS – (instrumentation) UltraViolet Spectrometer, the name of instruments on the Voyager and Galileo spacecraft
  • UXOR – (celestial object) UX ORionis objects, a class of variable pre–main sequence stars named after UX Orionis, the archetype for the class

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