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24 Themis information


24 Themis
Discovery
Discovered byAnnibale de Gasparis
Discovery date5 April 1853
Designations
MPC designation
(24) Themis
Pronunciation/ˈθmɪs/[1]
Named after
Themis
Alternative designations
1947 BA; 1955 OH
Minor planet category
Main belt (Themis)
AdjectivesThemistian[2] /θɪˈmɪstiən/[3]
Orbital characteristics[4]
Epoch 23 July 2010 (JD 2455400.5)
Aphelion529.4 Gm
(3.539 AU)
Perihelion406.8 Gm
(2.719 AU)
Semi-major axis
468.1 Gm
(3.129 AU)
Eccentricity0.1310
Orbital period (sidereal)
2021 d (5.54 yr)
Mean anomaly
146.6°
Inclination0.7595°
Longitude of ascending node
35.99°
Argument of perihelion
107.7°
Physical characteristics
Mean diameter
208±3 km[5]
198±20 km[6]
Flattening0.24[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]
Synodic rotation period
0.34892 d (8 h 23 min)[4]
Geometric albedo
0.060 (calculated)[5]
0.067[4]
Spectral type
C/B[4] (B-V=0.68)
Absolute magnitude (H)
7.25[4]

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.

Not to be confused with 269 Justitia, named for Justitia, Themis' Roman name.

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ Astronomy now, Volume 22 (2008)
  3. ^ "Themistian". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  4. ^ a b c d e "JPL Small-Body Database Browser: 24 Themis". 17 March 2010. Retrieved 27 May 2010.
  5. ^ 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
  6. ^ 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.
  7. ^ Michalak, G. (2001). "Determination of asteroid masses". Astronomy & Astrophysics. 374 (2): 703–711. Bibcode:2001A&A...374..703M. doi:10.1051/0004-6361:20010731.


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