_Hekate.png) 3D convex shape model of Hekate | |
| Discovery[1] | |
|---|---|
| Discovered by | J. C. Watson |
| Discovery date | 11 July 1868 |
| Designations | |
| (100) Hekate | |
| Pronunciation | /ˈhɛkətiː/[2] |
Named after | Hecate |
| 1955 QA | |
| Main belt | |
| Adjectives | Hekatean (Hecatæan)/hɛkəˈtiːən/[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 |
| 5.433yr (1984.4d) | |
| 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 | ~1.0×1018 kg |
Meandensity | ~2.7 g/cm3(estimate)[5] |
Equatorialsurface gravity | ~0.033 m/s2 |
Equatorialescape 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 | ~154K max: 238K (−35 °C) |
| S-type asteroid | |
| 7.67 | |
100 Hekate is a largemain-beltasteroid.
Hekate is a stonyS-type asteroid with a diameter of87+5
−4 km and a siderealrotation period of27.07 h.[7] It orbits in the same region of space as theHygiea asteroid family, though it is actually an unrelated interloper. However, its geometricalbedo of0.22±0.03[7] is too high, and it is of the wrong spectral class to be part of the darkcarbonaceous Hygiea family. It is listed as a member of theHecuba group of asteroids that orbit near the 2:1mean-motion resonance withJupiter.[8]
Hekate was the 100th asteroid to be discovered, by Canadian-American astronomerJ. C. Watson (his fourth discovery) on July 11, 1868.[9] It is named afterHecate, the goddess ofwitchcraft inGreek mythology, but its name also commemorates it as the hundredth asteroid, as ἑκατόν (hekaton) is Greek for 'hundred'.
Anoccultation of a star by Hekate was observed on July 14, 2003, fromNew Zealand.
