100 Hekate

Last updated

100 Hekate
Orbita asteroida 100.png
orbit
Discovery
Discovered by J. C. Watson
Discovery date11 July 1868
Designations
(100) Hekate
Pronunciation /ˈhɛkətiː/ [1]
Named after
 Hecate
1955 QA
Main belt
Adjectives Hekatean (Hecatæan) /hɛkəˈtiːən/ [1]
Orbital characteristics [2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 144.93 yr (52936 d)
Aphelion 3.61005  AU (540.056  Gm)
Perihelion 2.56919 AU (384.345 Gm)
3.08962 AU (462.201 Gm)
Eccentricity 0.16844
5.43 yr (1983.6 d)
64.6430°
0° 10m 53.357s / day
Inclination 6.42957°
127.199°
184.736°
Earth  MOID 1.55453 AU (232.554 Gm)
Jupiter  MOID 1.66378 AU (248.898 Gm)
TJupiter 3.194
Physical characteristics
Dimensions 88.66±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

    100 Hekate is a large main-belt asteroid.

    About

    3D convex shape model of Hekate 000100-asteroid shape model (100) Hekate.png
    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. [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]

    Contents

    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 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. 1 2 "Hecate" . Oxford English Dictionary (Online ed.). Oxford University Press.(Subscription or participating institution membership required.)
    2. 1 2 3 4 "100 Hekate". JPL Small-Body Database . Jet Propulsion Laboratory. SPK-ID:  2000100 . Retrieved 12 May 2016.
    3. 1 2 "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. 1 2 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.
    This page is based on this Wikipedia article
    Text is available under the CC BY-SA 4.0 license; additional terms may apply.
    Images, videos and audio are available under their respective licenses.