24 Themis
Themis (minor planet designation: 24 Themis) is one of the largest asteroids in the asteroid belt. It is also the largest member of the Themistian family. It was discovered by Annibale de Gasparis on 5 April 1853. It is named after Themis, the personification of natural law and divine order in Greek mythology.
| Discovery | |
|---|---|
| Discovered by | Annibale de Gasparis |
| Discovery date | 5 April 1853 |
| Designations | |
MPC designation | (24) Themis |
| Pronunciation | /ˈθiːmɪs/ |
Named after | Themis |
Alternative designations | 1947 BA; 1955 OH |
Minor planet category | Main belt (Themis) |
| Adjectives | Themistian /θɪˈmɪstiən/ |
| Orbital characteristics | |
| Epoch 23 July 2010 (JD 2455400.5) | |
| Aphelion | 529.4 Gm (3.539 AU) |
| Perihelion | 406.8 Gm (2.719 AU) |
Semi-major axis | 468.1 Gm (3.129 AU) |
| Eccentricity | 0.1310 |
Orbital period (sidereal) | 2021 d (5.54 yr) |
Mean anomaly | 146.6° |
| Inclination | 0.7595° |
Longitude of ascending node | 35.99° |
| 107.7° | |
| Physical characteristics | |
| Dimensions | c/a = 0.76±0.08 |
Mean diameter | 208±3 km 198±20 km |
| Mass | (6.2±2.9)×1018 kg (11.3±4.3)×1018 kg 2.3×1019 kg |
Mean density | 1.31±0.62 g/cm3 2.78±1.35 g/cm3 |
Equatorial surface gravity | 0.15+0.08 −0.07 m/s2 |
Equatorial escape velocity | 87+15 −20 m/s |
Synodic rotation period | 0.34892 d (8 h 23 min) |
| 0.060 (calculated) 0.067 | |
| C/B (B-V=0.68) | |
| 7.08 | |
Not to be confused with 269 Justitia, named for Justitia, Themis' Roman name.
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