W
- WD – (celestial object) White Dwarf
- WDM – (astrophysics terminology) Warm Dark Matter, any model for structure formation in the universe that characterizes "hot" particles such as neutrinos as dark matter
- WDS – (catalog) Washington Double Star, a catalog of double stars
- WEBT – (organization) Whole Earth Blazar Telescope, a network of observers across the Earth who work together to perform continuous observations of blazars
- WET – (organization) Whole Earth Telescope, a network of astronomers spread across the Earth who work together to perform continuous observations of variable stars
- WFCAM – (instrumentation) Wide Field Camera, a camera on the United Kingdom Infrared Telescope
- WFMOS – (instrumentation) Wide-Field Multi-Object Spectrograph, proposed instrument for the Gemini telescopes
- WFPC – (instrumentation) Wide Field and Planetary Camera, a camera formerly on the Hubble Space Telescope that was replaced with WFPC2
- WFPC2 – (instrumentation) Wide Field and Planetary Camera 2, a camera on the Hubble Space Telescope
- WFC – (instrumentation) Wide-Field Channel, one of the detectors in the Advanced Camera for Surveys on the Hubble Space Telescope
- WGPSN – (organization) Working Group for Planetary System Nomenclature
- WHT – (telescope) William Herschel Telescope
- WIMP – (celestial object) Weakly Interacting Massive Particle, a hypothetical subatomic particle that may comprise most of the dark matter in the universe
- WIRCam – (instrumentation) Wide-field InfraRed Camera, instrument on the Canada-France-Hawaii Telescope
- WISARD – (software) Web Interface for Searching Archival Research Data
- WISE – (observing program) Wide-field Infrared Survey Explorer
- WIYN – (telescope) Wisconsin-Indiana-Yale-NOAO, the name of a telescope at Kitt Peak operated by the University of Wisconsin–Madison, Indiana University, Yale University, and the National Optical Astronomy Observatory
- WLM – (celestial object) Wolf-Lundmark-Melotte, a nearby dwarf galaxy in the constellation Cetus
- WMAP – (telescope) Wilkinson Microwave Anisotrophy Probe, a space telescope used to study the cosmic microwave background radiation
- WR – (celestial object) Wolf-Rayet, a type of hot, luminous star with strong stellar winds
- WC – (celestial object) Carbon-rich Wolf-Rayet, a Wolf-Rayet star with strong carbon spectral line emission
- WN – (celestial object) Nitrogen-rich Wolf-Rayet, a Wolf-Rayet star with strong nitrogen spectral line emission
- WNE – (celestial object) Early-type Nitrogen-rich Wolf-Rayet, a WN star without hydrogen spectral line emission
- WNL – (celestial object) Late-type Nitrogen-rich Wolf-Rayet, a WN star with hydrogen spectral line emission
- WO – (celestial object) Oxygen-rich Wolf-Rayet, a Wolf-Rayet star with strong oxygen spectral line emission
- WSRT – (telescope) an aperture synthesis interferometer that consists of a linear array of 14 antennas
- WTTS – (celestial object) Weak-Line T-Tauri Star, a type of young star with weak spectral line emission
Read more about this topic: List Of Astronomy Acronyms