100 Hekate

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100 Hekate
Discovered by J. C. Watson
Discovery date July 11, 1868
Named after
1955 QA
Main belt
Orbital characteristics[1]
Epoch April 18, 2013 (JD 2456400.5)
Aphelion 539.574 Gm (3.60683 AU)
Perihelion 384.245 Gm (2.56852 AU)
461.910 Gm (3.08768 AU)
Eccentricity 0.168
1,981.736 d (5.43 a)
Inclination 6.430°
Physical characteristics
Dimensions 89 km[2]
Mass ~1.0×1018 kg
Mean density
~2.7 g/cm³ (estimate)[3]
~0.033 m/s²
~0.054 km/s
0.5555 d [4]
Albedo 0.192[2]
Temperature ~154 K
max: 238K (-35°C)
Spectral type
S-type asteroid

100 Hekate (/ˈhɛkət/ HEK-ə-tee) 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.[5]

Hekate was the 100th asteroid to be discovered, by J. C. Watson (his fourth discovery) on July 11, 1868.[6] 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.


  1. ^ "100 Hekate". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 2000100. Retrieved 2013-04-07. 
  2. ^ a b "IRAS Minor Planet Survey". Archived from the original on 2005-12-22. 
  3. ^ Krasinsky, G. A. (2002). "Hidden Mass in the Asteroid Belt" (PDF). Icarus 158: 98. Bibcode:2002Icar..158...98K. doi:10.1006/icar.2002.6837. 
  4. ^ "Asteroid Lightcurve Parameters". 
  5. ^ 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. 
  6. ^ "Discovery Circumstances: Numbered Minor Planets 1–5000". IAU Minor Planet Center. Retrieved 2013-04-07.