Term Index (Y)

Astrophysics (Index)

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Astrophysical terms and names of things beginning with the letter Y.

Y (Y-type star): brown dwarf with a temperature less than 700 K
Y: see helium
Y: see mass fraction
- metallicity: metal fraction of an object
Y dwarf (Y-type star): brown dwarf with a temperature less than 700 K
- brown dwarf: star-like object with less mass than a star
Y-class: see Y-type star
Y-parameter: see Compton scattering
- cluster radius: radius of a galaxy cluster
- Sunyaev-Zel'dovich effect: type of distortion of the CMB
Y-type star: brown dwarf with a temperature less than 700 K
Y₅₀₀: see cluster radius
Y_e: see r-process
Y_p: see Big Bang nucleosynthesis
Y_p: see helium
Y_p: see mass fraction
Y_SZ: see Sunyaev-Zel'dovich effect
Y_SZ-L_X relation: see Sunyaev-Zel'dovich effect
Y_SZ-M relation: see Sunyaev-Zel'dovich effect
Y_SZ-Y_X relation: see Sunyaev-Zel'dovich effect
Y_X: see Sunyaev-Zel'dovich effect
Yale Bright Star Catalogue (Bright Star Catalog): early 20th century catalog of 9000 stars
Yale Catalogue of Bright Stars (Bright Star Catalog): early 20th century catalog of 9000 stars
Yale Observatory

Yale Observatory Zone Catalog: mid-20th century catalogs totaling 400,000 stars
Yale University

Yarkovsky effect: force on spinning, orbiting objects from asymmetric radiation
Yarkovsky-O'Keefe-Radzievskii-Paddack effect: rotational effect on asymmetric asteroids
YBP: see rare designator prefixes
YBS (Bright Star Catalog): early 20th century catalog of 9000 stars
yellow dwarf: see G-type star
yellow giant: see giant star
- G-type star: stars spectrally similar to the Sun
- red giant: very bright red star
yellow hypergiant: see hypergiant
- G-type star: stars spectrally similar to the Sun
yellow straggler: see turn-off point
yellow supergiant: see supergiant
- G-type star: stars spectrally similar to the Sun
Yepun Telescope: see European Southern Observatory Very Large Telescope
Yerkes classification (Morgan classification): classification of galaxies by stellar spectrum and morphology
Yerkes galaxy classification (Morgan classification): classification of galaxies by stellar spectrum and morphology
- elliptical galaxy: ellipsoidal-shaped galaxy
Yerkes Observatory

YGKOW: see rare designator prefixes
YLW: see rare designator prefixes
YM: see rare designator prefixes
Yohkoh: 1990s Japanese solar observatory spacecraft
Yolo telescope: type of reflector telescope
YORP (Yarkovsky-O'Keefe-Radzievskii-Paddack effect): rotational effect on asymmetric asteroids
YORP effect (Yarkovsky-O'Keefe-Radzievskii-Paddack effect): rotational effect on asymmetric asteroids
young star

COUP: survey of X-ray sources in the Orion Nebula
Gould's Belt Distances Survey: survey of parallax distances to Gould's Belt YSOs
Herschel Orion Protostar Survey: survey of SEDs of YSOs in Orion
Lick Observatory Calcium Line Survey: 1980s survey of T-Tauri stars in the Taurus-Auriga Complex

YSOVAR: see Spitzer Space Telescope
YSS: see turn-off point
yt: analysis and display software
YTLA (Yuan-Tseh Lee Array): microwave interferometer in Hawaii
- AIM-CO: survey of CO from star-forming epoch
Yuan-Tseh Lee Array: microwave interferometer in Hawaii
- AIM-CO: survey of CO from star-forming epoch
Yuan-Tseh Lee Array for Microwave Background Anisotropy (Yuan-Tseh Lee Array): microwave interferometer in Hawaii
Yucatan Peninsula

Chicxulub crater: ancient giant impact crater under Mexico and the Gulf of Mexico

YZ (Yale Observatory Zone Catalog): mid-20th century catalogs totaling 400,000 stars