# https://pdssbn.astro.umd.edu/data_other/objclass.shtml - model: spaceobjects.OrbitClass pk: 1 fields: abbrev: COM name: Unclassified Comet slug: unclassified-comets desc: Comets whose orbits do not match any defined orbit class orbit_sentence: whose orbit does not match any defined comet orbit class - model: spaceobjects.OrbitClass pk: 2 fields: abbrev: CTc name: Chiron-type Comet slug: chiron-type-comets desc: Chiron-type comet, as defined by Levison and Duncan (TJupiter > 3; a > aJupiter) orbit_sentence: whose orbit is approximately between Jupiter and Neptune - model: spaceobjects.OrbitClass pk: 3 fields: abbrev: ETc name: Encke-type Comet slug: encke-type-comets desc: Encke-type comet, as defined by Levison and Duncan (TJupiter > 3; a < aJupiter) orbit_sentence: whose orbit brings it closer to the sun than Jupiter - model: spaceobjects.OrbitClass pk: 4 fields: abbrev: HTC name: Halley-type Comet slug: halley-type-comets desc: Halley-type comet, classical definition (20 y < P < 200 y) orbit_sentence: with a medium-length orbit that is highly inclined to the ecliptic plane of the solar system - model: spaceobjects.OrbitClass pk: 5 fields: abbrev: HYP name: Hyperbolic Comet slug: hyperbolic-comets desc: Comets on hyperbolic orbits (e > 1.0) orbit_sentence: with a trajectory through the solar system likely originating from the Oort Cloud - model: spaceobjects.OrbitClass pk: 6 fields: abbrev: JFc name: Jupiter-family Comet slug: jupiter-family-comets desc: Jupiter-family comets, as defined by Levison and Duncan (2 < TJupiter < 3) orbit_sentence: whose orbit features a relatively short period, low inclination, and is controlled by Jupiter's gravitational effects - model: spaceobjects.OrbitClass pk: 8 fields: abbrev: PAR name: Parabolic Comet slug: parabolic-comets desc: Comets on parabolic orbits (e = 1.0) orbit_sentence: with an extremely long orbital period, likely originating from the Oort Cloud - model: spaceobjects.OrbitClass pk: 9 fields: abbrev: AMO name: Amor-class Asteroid slug: amor-class-asteroids desc: Near-Earth asteroid whose orbits are similar to that of 1221 Amor (a > 1.0 AU; 1.017 AU < q < 1.3 AU) orbit_sentence: whose orbit approaches the orbit of Earth but does not cross it - model: spaceobjects.OrbitClass pk: 10 fields: abbrev: APO name: Apollo-class Asteroid slug: apollo-class-asteroids desc: Near-Earth asteroids whose orbits cross the Earth's orbit similar to that of 1862 Apollo (a > 1.0 AU; q < 1.017 AU). orbit_sentence: whose orbit crosses the orbit of Earth - model: spaceobjects.OrbitClass pk: 11 fields: abbrev: AST name: Asteroid slug: asteroids desc: Asteroid orbit not matching any defined orbit class orbit_sentence: whose orbit does not match any defined asteroid orbital class - model: spaceobjects.OrbitClass pk: 12 fields: abbrev: ATE name: Aten-class Asteroid slug: aten-class-asteroids desc: Near-Earth asteroid orbits similar to that of 2062 Aten (a < 1.0 AU; Q > 0.983 AU) orbit_sentence: whose orbit could bring it in close proximity to Earth - model: spaceobjects.OrbitClass pk: 13 fields: abbrev: CEN name: Centaur-class Asteroid slug: centaur-class-asteroids desc: Objects with orbits between Jupiter and Neptune (5.5 AU < a < 30.1 AU) orbit_sentence: with an orbit between Jupiter and Neptune - model: spaceobjects.OrbitClass pk: 14 fields: abbrev: HYA name: Hyperbolic Asteroid slug: hyperbolic-asteroids desc: Asteroids on hyperbolic orbits (e > 1.0) orbit_sentence: with an orbit not bound to the sun - model: spaceobjects.OrbitClass pk: 15 fields: abbrev: IEO name: Interior-Earth Asteroid slug: interior-earth-asteroids desc: Asteroids with orbits contained entirely within the orbit of the Earth (Q < 0.983 AU) orbit_sentence: with an orbit that is entirely confined within Earth's orbit - model: spaceobjects.OrbitClass pk: 16 fields: abbrev: IMB name: Inner Main-belt Asteroid slug: inner-main-belt-asteroids desc: Asteroids with orbital elements constrained by (a < 2.0 AU; q > 1.666 AU) orbit_sentence: orbiting between Mars and Jupiter within the inner portion of the asteroid belt - model: spaceobjects.OrbitClass pk: 17 fields: abbrev: MBA name: Main-belt Asteroid slug: main-belt-asteroids desc: Asteroids with orbital elements constrained by (2.0 AU < a < 3.2 AU; q > 1.666 AU) orbit_sentence: orbiting between Mars and Jupiter in the main portion of the asteroid belt - model: spaceobjects.OrbitClass pk: 18 fields: abbrev: MCA name: Mars-crossing Asteroid slug: mars-crossing-asteroids desc: Asteroids that cross the orbit of Mars constrained by (1.3 AU < q < 1.666 AU; a < 3.2 AU) orbit_sentence: with an orbit that crosses the orbit of Mars - model: spaceobjects.OrbitClass pk: 19 fields: abbrev: OMB name: Outer Main-belt Asteroid slug: outer-main-belt-asteroids desc: Asteroids with orbital elements constrained by (3.2 AU < a < 4.6 AU) orbit_sentence: that orbits between Mars and Jupiter in the outer reaches of the main asteroid belt - model: spaceobjects.OrbitClass pk: 20 fields: abbrev: PAA name: Parabolic Asteroid slug: parabolic-asteroids desc: Asteroids on parabolic orbits (e = 1.0) orbit_sentence: with an unusual orbit that brings it far beyond the normal boundaries of asteroids in the solar system - model: spaceobjects.OrbitClass pk: 21 fields: abbrev: TJN name: Jupiter Trojan slug: jupiter-trojans desc: Asteroids trapped in Jupiter's L4/L5 Lagrange points (4.6 AU < a < 5.5 AU; e < 0.3) orbit_sentence: that shares Jupiter's orbit around the sun - model: spaceobjects.OrbitClass pk: 22 fields: abbrev: TNO name: Trans-Neptunian Object slug: trans-neptunian-objects desc: Objects with orbits outside Neptune (a > 30.1 AU) orbit_sentence: whose orbit extends beyond the orbit of Neptune