 | |
| 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 23 July 2010 (JD 2455400.5) | |
| Aphelion | 529.4 Gm (3.539 AU) |
| Perihelion | 406.8 Gm (2.719 AU) |
| 468.1 Gm (3.129 AU) | |
| Eccentricity | 0.1310 |
| 2021 d (5.54 yr) | |
| 146.6° | |
| Inclination | 0.7595° |
| 35.99° | |
| 107.7° | |
| Physical characteristics | |
| 208±3 km[5] 198±20 km[6] | |
| Flattening | 0.24[a] |
| Mass | (6.2±2.9)×1018 kg[5] (11.3±4.3)×1018 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 23 min)[4] | |
| 0.060 (calculated)[5] 0.067[4] | |
| C/B[4] (B-V=0.68) | |
| 7.25[4] | |
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". 17 March 2010. Retrieved 27 May 2010.
- ^ a b c d e 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).