100 Hekate
Main-belt asteroid
From Wikipedia, the free encyclopedia
100 Hekate is a large main-belt asteroid.
_Hekate.png)
3D convex shape model of Hekate | |
| Discovery[1] | |
|---|---|
| Discovered by | J. C. Watson |
| Discovery date | 11 July 1868 |
| Designations | |
| (100) Hekate | |
| Pronunciation | /ËhÉkÉtiË/[2] |
Named after | Hecate |
| 1955 QA | |
| Main belt | |
| Adjectives | Hekatean (Hecatæan) /hÉkÉËtiËÉn/[2] |
| Orbital characteristics[3] | |
| Epoch 2025 Nov 21 (JD 2461000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 154.56 yr (56452 d) |
| Aphelion | 3.60957 AU (539.984 Gm) |
| Perihelion | 2.57132 AU (384.664 Gm) |
| 3.09045 AU (462.325 Gm) | |
| Eccentricity | 0.16798 |
| 5.433 yr (1984.4 d) | |
| 323.244° | |
| 0° 10m 53.093s / day | |
| Inclination | 6.43092° |
| 127.156° | |
| 183.552° | |
| Earth MOID | 1.55453 AU (232.554 Gm) |
| Jupiter MOID | 1.66378 AU (248.898 Gm) |
| TJupiter | 3.194 |
| Physical characteristics | |
| Dimensions | 88.734±1.961 km[3] 89 km[4] |
| Mass | ~1.0Ã1018 kg |
Mean density | ~2.7 g/cm3 (estimate)[5] |
Equatorial surface gravity | ~0.033 m/s2 |
Equatorial escape velocity | ~0.054 km/s |
| 27.066 h (1.1278 d)[3] 0.5555 d[6] | |
| 0.205±0.01[3] 0.192[4] | |
| Temperature | ~154 K max: 238K (â35 °C) |
| S-type asteroid | |
| 7.67 | |
About
Hekate is a stony S-type asteroid with a diameter of 87+5
â4 km and a sidereal rotation period of 27.07 h.[7] It orbits in the same region of space as the Hygiea asteroid family, though it is actually an unrelated interloper. Its geometric albedo of 0.22±0.03[7] 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.[8]
Hekate was the 100th asteroid to be discovered, by Canadian-American astronomer J. C. Watson (his fourth discovery) on July 11, 1868.[9] It is named after Hecate, the goddess of witchcraft in Greek mythology, but its name also commemorates it as the hundredth asteroid, as á¼ÎºÎ±ÏÏν (hekaton) is Greek for 'hundred'.
An occultation of a star by Hekate was observed on July 14, 2003, from New Zealand.
