dwarf planetn.

Brit.

/ˈdwɔːf ˌplanɪt/, U.S.

/ˈd(w)ɔrf ˌplænət/

Origin: Formed within English, by compounding. Etymons: dwarf adj., planet n.

Etymology: < dwarf adj. + planet n.

Astronomy.

A small planet; spec. (a) an asteroid (now rare); (b) a terrestrial planet (one of the group Mercury, Venus, Earth, Mars); frequently contrasted with giant planet; (c) a celestial object in orbit around the sun that has sufficient mass to assume a near-spherical shape but has not cleared its orbital neighbourhood of other objects by its gravitational attraction.The term was redefined in sense (c) by the International Astronomical Union in 2006 as part of the revision of the classification of celestial objects within the solar system (cf. planet n. 3a and the note there). Dwarf planets in this sense that are currently recognized include Pluto, Ceres, and Eris.

ΘΚΠ

the world > the universe > planet > primary planet > minor planet or asteroid > [noun]

asteroid1802

cometoid1803

planetoid1803

minor planet1823

dwarf planet1839

worldlet1841

1839 Fantastical Excursion into Planets 98 Our landing had been on the territory of one of the dwarf planets, which our astronomer had given in lease to four antiquated divinities, namely to Vesta, Juno, Ceres and Pallas.

1848 A. H. tr. J. P. F. Richter Levana iii. 154 I will have no instructor out of Pallas—a morsel broken from the earth..; I purposely mention this dwarf planet, because your preference for Athens, whose protecting deity Pallas was, might perhaps influence you.

1874 Q. Jrnl. Sci. 41 306 Precisely as the study of the giant planets, Jupiter and Saturn, has led astronomers to infer that certain peculiarities must result from vastness of dimensions, so the study of the dwarf planets, Mars, our moon, and Mercury, may indicate the relations we are to associate with inferiority of size.

1911 S. Bloch tr. B. H. Bürgel Astron. for All xx. 226 Origin of the dwarf planets.—The question of how this gigantic swarm of miniature planets [sc. the asteroids] originated has not been definitely settled.

1924 Times 28 Aug. 13/4 Dr. Hector Macpherson..emphasized the insignificance of the earth as a dwarf planet revolving round a dwarf star.

1964 Kansas City (Missouri) Star 2 Dec. 4 c/1 Mars is also a dwarf planet. With a diameter of 4,200 miles—half that of the earth and only one-tenth as massive.

1990 New Scientist 10 Feb. (Inside Sci. section) 1 (caption) Close to the sun are the four ‘dwarf’ planets that are dense because they are made of rock and iron.

2006 Indianapolis Star 25 Aug. (State ed.) a3/1 Astronomers rejiggered the nine-planet solar system for the first time in 76 years Thursday, kicking out Pluto and creating a new category of ‘dwarf planets’.

2007 D. A. Weintraub Is Pluto a Planet? 225 Subdwarf planets (e.g., Pluto, Charon, Ceres, etc., with masses less than 3 percent of an Earth mass), dwarf planets (e.g., Ganymede, Mercury, Mars, Venus, Earth, with masses less than 100 Earth masses), giants (e.g., Jupiter, with masses less than 30,000 Earth masses).

This is a new entry (OED Third Edition, June 2009; most recently modified version published online March 2022).

单词	dwarf planet
释义	dwarf planetn. Brit. /ˈdwɔːf ˌplanɪt/, U.S. /ˈd(w)ɔrf ˌplænət/ Origin: Formed within English, by compounding. Etymons: dwarf adj., planet n. Etymology: < dwarf adj. + planet n. Astronomy. A small planet; spec. (a) an asteroid (now rare); (b) a terrestrial planet (one of the group Mercury, Venus, Earth, Mars); frequently contrasted with giant planet; (c) a celestial object in orbit around the sun that has sufficient mass to assume a near-spherical shape but has not cleared its orbital neighbourhood of other objects by its gravitational attraction.The term was redefined in sense (c) by the International Astronomical Union in 2006 as part of the revision of the classification of celestial objects within the solar system (cf. planet n. 3a and the note there). Dwarf planets in this sense that are currently recognized include Pluto, Ceres, and Eris. ΘΚΠ the world > the universe > planet > primary planet > minor planet or asteroid > [noun] asteroid1802 cometoid1803 planetoid1803 minor planet1823 dwarf planet1839 worldlet1841 1839 Fantastical Excursion into Planets 98 Our landing had been on the territory of one of the dwarf planets, which our astronomer had given in lease to four antiquated divinities, namely to Vesta, Juno, Ceres and Pallas. 1848 A. H. tr. J. P. F. Richter Levana iii. 154 I will have no instructor out of Pallas—a morsel broken from the earth..; I purposely mention this dwarf planet, because your preference for Athens, whose protecting deity Pallas was, might perhaps influence you. 1874 Q. Jrnl. Sci. 41 306 Precisely as the study of the giant planets, Jupiter and Saturn, has led astronomers to infer that certain peculiarities must result from vastness of dimensions, so the study of the dwarf planets, Mars, our moon, and Mercury, may indicate the relations we are to associate with inferiority of size. 1911 S. Bloch tr. B. H. Bürgel Astron. for All xx. 226 Origin of the dwarf planets.—The question of how this gigantic swarm of miniature planets [sc. the asteroids] originated has not been definitely settled. 1924 Times 28 Aug. 13/4 Dr. Hector Macpherson..emphasized the insignificance of the earth as a dwarf planet revolving round a dwarf star. 1964 Kansas City (Missouri) Star 2 Dec. 4 c/1 Mars is also a dwarf planet. With a diameter of 4,200 miles—half that of the earth and only one-tenth as massive. 1990 New Scientist 10 Feb. (Inside Sci. section) 1 (caption) Close to the sun are the four ‘dwarf’ planets that are dense because they are made of rock and iron. 2006 Indianapolis Star 25 Aug. (State ed.) a3/1 Astronomers rejiggered the nine-planet solar system for the first time in 76 years Thursday, kicking out Pluto and creating a new category of ‘dwarf planets’. 2007 D. A. Weintraub Is Pluto a Planet? 225 Subdwarf planets (e.g., Pluto, Charon, Ceres, etc., with masses less than 3 percent of an Earth mass), dwarf planets (e.g., Ganymede, Mercury, Mars, Venus, Earth, with masses less than 100 Earth masses), giants (e.g., Jupiter, with masses less than 30,000 Earth masses). This is a new entry (OED Third Edition, June 2009; most recently modified version published online March 2022). < n.1839
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