100 Hekate

Hekate (minor planet designation: 100 Hekate) is a large main-belt asteroid. This is a stony S-type asteroid with a diameter of 87+5
−4 km and a sidereal rotation period of 27.07 h.[6] It orbits in the same region of space as the Hygiea asteroid family, though it is actually an unrelated interloper. However, its geometric albedo of 0.22±0.03[6] 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.[7]

100 Hekate
Discovery
Discovered byJ. C. Watson
Discovery date11 July 1868
Designations
(100) Hekate
Pronunciation/ˈhɛkətiː/[1]
Named after
Hecate
1955 QA
Main belt
AdjectivesHekatean (Hecatæan) /hɛkəˈtiːən/[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)
Eccentricity0.16844
5.43 yr (1983.6 d)
64.6430°
0° 10m 53.357s / day
Inclination6.42957°
127.199°
184.736°
Earth MOID1.55453 AU (232.554 Gm)
Jupiter MOID1.66378 AU (248.898 Gm)
TJupiter3.194
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]
0.1922±0.009[2]
0.192[3]
Temperature~154 K
max: 238K (-35°C)
S-type asteroid
7.67

    Hekate was the 100th asteroid to be discovered, by Canadian-American astronomer J. C. Watson (his fourth discovery) on July 11, 1868.[8] 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

    References
    1. "Hecate". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
    2. "100 Hekate". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 2000100. Retrieved 12 May 2016.
    3. "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. Marciniak, A.; et al. (May 2019). "Thermal properties of slowly rotating asteroids: results from a targeted survey". Astronomy & Astrophysics. 625: 40. arXiv:1905.06056. Bibcode:2019A&A...625A.139M. doi:10.1051/0004-6361/201935129. A139.
    7. 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.
    8. "Discovery Circumstances: Numbered Minor Planets 1–5000". IAU Minor Planet Center. Retrieved 7 April 2013.

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