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100 Hekate

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Main-belt asteroid

100 Hekate
orbit
Discovery
Discovered byJ. C. Watson
Discovery date11 July 1868
Designations
MPC designation(100) Hekate
Pronunciation/ˈhɛkətiː/
Named afterHecate
Alternative designations1955 QA
Minor planet categoryMain belt
AdjectivesHekatean (Hecatæan) /hɛkəˈtiːən/
Orbital characteristics
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)
Semi-major axis3.08962 AU (462.201 Gm)
Eccentricity0.16844
Orbital period (sidereal)5.43 yr (1983.6 d)
Mean anomaly64.6430°
Mean motion0° 10 53.357 / day
Inclination6.42957°
Longitude of ascending node127.199°
Argument of perihelion184.736°
Earth MOID1.55453 AU (232.554 Gm)
Jupiter MOID1.66378 AU (248.898 Gm)
TJupiter3.194
Physical characteristics
Dimensions88.66±2.0 km
89 km
Mass~1.0×10 kg
Mean density~2.7 g/cm (estimate)
Equatorial surface gravity~0.033 m/s
Equatorial escape velocity~0.054 km/s
Synodic rotation period27.066 h (1.1278 d)
0.5555 d
Geometric albedo0.1922±0.009
0.192
Temperature~154 K
max: 238K (-35°C)
Spectral typeS-type asteroid
Absolute magnitude (H)7.67

100 Hekate is a large main-belt asteroid.

About

3D convex shape model of Hekate

This is a stony S-type asteroid with a diameter of 87+5
−4 km and a sidereal rotation period of 27.07 h. 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 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.

Hekate was the 100th asteroid to be discovered, by Canadian-American astronomer J. C. Watson (his fourth discovery) on July 11, 1868. It is named after Hecate, the goddess of witchcraft in Greek mythology, but its name also commemorates it as the hundredth asteroid, as ἑκατόν (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 (1): 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. S2CID 146059739. 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.

External links

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