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121 Hermione information


121 Hermione
121 Hermione and its moon
Discovery[1]
Discovered byJames Craig Watson
Discovery date12 May 1872
Designations
MPC designation
(121) Hermione
Pronunciation/hɜːrˈm.ən/[2]
Named after
Hermione[3]
(Greek mythology)
Alternative designations
A872 JA; 1970 VE
Minor planet category
main-belt · Cybele
AdjectivesHermionean /hɜːrm.əˈnən/
Orbital characteristics[4]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc145.96 yr (53,312 d)
Aphelion3.9067 AU
Perihelion2.9889 AU
Semi-major axis
3.4478 AU
Eccentricity0.1331
Orbital period (sidereal)
6.40 yr (2,338 d)
Mean anomaly
157.08°
Mean motion
0° 9m 14.4s / day
Inclination7.5975°
Longitude of ascending node
73.127°
Argument of perihelion
298.18°
Known satellitesS/2002 (121) 1
Physical characteristics
Dimensions268 × 186 × 183 km[5]
(254 ± 4) × (125 ± 9) km[6]
Mean radius
95 km[6]
Volume(3.0±0.4)×106 km3[7]
Mass(5.381±5%)×1018 kg[7]
Mean density
1.8 ± 0.2 g/cm3[7][a]
Equatorial surface gravity
0.022 m/s2[b]
Equatorial escape velocity
0.075 km/s[b]
Sidereal rotation period
0.2313 d (5.551 h)[8]
Axial tilt
73°
Pole ecliptic latitude
+10 ± 2°[7]
Pole ecliptic longitude
1.5 ± 2°
Geometric albedo
0.0482 ± 0.002[9]
Spectral type
C[10]
Absolute magnitude (H)
7.31[9]

Hermione (minor planet designation: 121 Hermione) is a very large binary asteroid discovered in 1872. It orbits in the Cybele group in the far outer asteroid belt.[11] As an asteroid of the dark C spectral type, it is probably composed of carbonaceous materials. In 2002, a small moon was found to be orbiting Hermione.[11]

  1. ^ Cite error: The named reference MPC-object was invoked but never defined (see the help page).
  2. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  3. ^ Cite error: The named reference springer was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference jpldata was invoked but never defined (see the help page).
  5. ^ Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. Archived from the original on 2 July 2013. Retrieved 7 December 2008.
  6. ^ a b F. Marchis; et al. (2006). "Shape, size and multiplicity of main-belt asteroids I. Keck Adaptive Optics survey". Icarus. 185 (1): 39–63. Bibcode:2006Icar..185...39M. doi:10.1016/j.icarus.2006.06.001. PMC 2600456. PMID 19081813.
  7. ^ a b c d F. Marchis; et al. (2005). "Mass and density of Asteroid 121 Hermione from an analysis of its companion orbit". Icarus. 178 (2): 450–464. Bibcode:2005Icar..178..450M. doi:10.1016/j.icarus.2005.05.003.
  8. ^ IAUC 8264 Archived 9 July 2008 at the Wayback Machine
  9. ^ a b Supplemental IRAS minor planet survey Archived 2009-08-17 at the Wayback Machine
  10. ^ PDS node taxonomy database Archived 2009-08-05 at the Wayback Machine
  11. ^ a b Linda T. Elkins-Tanton (2010). Asteroids, Meteorites, and Comets. Infobase Publishing. p. 96. ISBN 978-1-4381-3186-3.


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).

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