Back (24) Themis ALS 24 تيميس Arabic 24 تيميس (كويكب) ARZ 24 Themis AST (24) Themis BAR (24) Феміда BE (24) Temis Catalan (24) Фемида CE Themis (planetka) Czech (24) Themis German
 | |
| Discovery | |
|---|---|
| Discovered by | Annibale de Gasparis |
| Discovery date | 5 April 1853 |
| Designations | |
| (24) Themis | |
| Pronunciation | /ˈθiːmɪs/[1] |
Named after | Themis |
| 1947 BA; 1955 OH | |
| Main belt (Themis) | |
| Adjectives | Themistian[2] /θɪˈmɪstiən/[3] |
| Orbital characteristics[4] | |
| Epoch 17.0 October 2024 (JD 2460600.5) | |
| Aphelion | 524.4 Gm (3.505 AU) |
| Perihelion | 415.9 Gm (2.780 AU) |
| 470.2 Gm (3.143 AU) | |
| Eccentricity | 0.1153 |
| 2035 d (5.57 yr) | |
| 346.1° | |
| Inclination | 0.7368° |
| 36.39° | |
| 109.0° | |
| Earth MOID | 1.79422 AU |
| Jupiter MOID | 1.50402 AU |
| TJupiter | 3.199 |
| Physical characteristics | |
| Dimensions | 232 × 220 × 176 ± 14 km[5] |
| 208±3 km[5] 198±20 km[6] | |
| Flattening | 0.24[a] |
| Mass | (6.2±2.9)×1018 kg[5] (1.13±0.43)×1019 kg[6] 2.39×1019 kg[7][b] |
Mean density | 1.31±0.62 g/cm3[5] 2.78±1.35 g/cm3[6] |
Equatorial surface gravity | 0.15+0.08 −0.07 m/s2[6] |
Equatorial escape velocity | 87+15 −20 m/s[6] |
| 0.34892 d (8 h 22 min)[4] 8.374187±0.000001 h[5] | |
| 18°[5] | |
Pole ecliptic latitude | 73°±3°[5] |
Pole ecliptic longitude | 146°±3°[5] |
| 0.060 (calculated)[5] 0.067[4] | |
| C/B[4] (B-V=0.68) | |
| 7.24[4] 7.08[5] | |
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.
Not to be confused with 269 Justitia, named for Justitia, Themis' Roman name.
- ^ Noah Webster (1884) A Practical Dictionary of the English Language
- ^ Astronomy now, Volume 22 (2008)
- ^ "Themistian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ a b c d e "JPL Small-Body Database Browser: 24 Themis". 12 December 2024. Retrieved 22 December 2024.
- ^ a b c d e f g h i j k P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
- ^ a b c d e Baer, James; Steven R. Chesley (25 June 1999). "Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris". Celest. Mech. Dyn. Astron. 100 (2008). Springer Science+Business Media B.V. 2007: 27–42. Bibcode:2008CeMDA.100...27B. doi:10.1007/s10569-007-9103-8.
- ^ Michalak, G. (2001). "Determination of asteroid masses". Astronomy & Astrophysics. 374 (2): 703–711. Bibcode:2001A&A...374..703M. doi:10.1051/0004-6361:20010731.
Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).