![]() orbit | |
Discovery | |
---|---|
Discovered by | J. C. Watson |
Discovery date | 11 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 | |
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]
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.
![]() orbit | |
Discovery | |
---|---|
Discovered by | J. C. Watson |
Discovery date | 11 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 | |
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]
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.