(100) Hekate

100 Hekate
Discovered byJ. C. Watson
Discovery date11 July 1868
(100) Hekate
Named after
1955 QA
Main belt
AdjectivesHekatean (Hecatæan) /hɛkəˈtən/[1]
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc144.93 yr (52936 d)
Aphelion3.61005 AU (540.056 Gm)
Perihelion2.56919 AU (384.345 Gm)
3.08962 AU (462.201 Gm)
5.43 yr (1983.6 d)
0° 10m 53.357s / day
Earth MOID1.55453 AU (232.554 Gm)
Jupiter MOID1.66378 AU (248.898 Gm)
Physical characteristics
Dimensions88.66±2.0 km[2]
89 km[3]
Mass~1.0×1018 kg
Mean density
~2.7 g/cm³ (estimate)[4]
Equatorial surface gravity
~0.033 m/s²
Equatorial escape velocity
~0.054 km/s
27.066 h (1.1278 d)[2]
0.5555 d [5]
Temperature~154 K
max: 238K (-35°C)
S-type asteroid

Hekate (minor planet designation: 100 Hekate) is a large main-belt asteroid. It orbits in the same region of space as the Hygiea asteroid family, though it is actually an unrelated interloper. Its albedo of 0.19 is too high, and it is of the wrong spectral class to be part of the dark carbonaceous Hygiea family. It is listed as a member of the Hecuba group of asteroids that orbit near the 2:1 mean-motion resonance with Jupiter.[6]

Hekate was the 100th asteroid to be discovered, by J. C. Watson (his fourth discovery) on July 11, 1868.[7] It is named after Hecate, the goddess of witchcraft in Greek mythology, but its name also commemorates it as the hundredth asteroid, as hekaton is Greek for 'hundred'.

A Hekatean occultation of a star was observed on July 14, 2003, from New Zealand.

See also[]


  1. ^ a b "Hecate". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
  2. ^ a b c d "100 Hekate". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 2000100. Retrieved 12 May 2016.
  3. ^ a b "IRAS Minor Planet Survey". Archived from the original on 11 December 2005.
  4. ^ Krasinsky, G. A. (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158: 98. Bibcode:2002Icar..158...98K. doi:10.1006/icar.2002.6837.
  5. ^ "Asteroid Lightcurve Parameters".
  6. ^ McDonald, S. L. (1948). "General perturbations and mean elements, with representations of 35 minor planets of the Hecuba group". The Astronomical Journal. 53: 199. Bibcode:1948AJ.....53..199M. doi:10.1086/106097.
  7. ^ "Discovery Circumstances: Numbered Minor Planets 1–5000". IAU Minor Planet Center. Retrieved 7 April 2013.

External links[]