100 Hekate
_Hekate.png) 3D convex shape model of Hekate | |
| Discovery[1] | |
|---|---|
| Discovered by | J. C. Watson |
| Discovery date | 11 July 1868 |
| Designations | |
| 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 |
| 5.433 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 | ~1.0×1018 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 (−35 °C) |
| S-type asteroid | |
| 7.67 | |
About
[edit]
Hekate is a stony S-type asteroid with a diameter of 87+5
−4 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 ἑκατόν (hekaton) is Greek for 'hundred'.
An occultation of a star by Hekate was observed on July 14, 2003, from New Zealand.
See also
[edit]References
[edit]- ↑ "100 Hekate". Minor Planet Center. Retrieved 23 October 2025.
- 1 2 "Hecate". Oxford English Dictionary (online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- 1 2 3 4 "100 Hekate". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 2000100. Retrieved 23 October 2025.
- 1 2
"IRAS Minor Planet Survey".
{{cite web}}: CS1 maint: deprecated archival service (link) - ↑ Krasinsky, G. A. (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158 (1): 98. Bibcode:2002Icar..158...98K. doi:10.1006/icar.2002.6837.
- ↑ "Asteroid Lightcurve Parameters".
- 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.
- ↑ 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.
- ↑ "Discovery Circumstances: Numbered Minor Planets 1–5000". IAU Minor Planet Center. Retrieved 7 April 2013.
External links
[edit]- 100 Hekate at AstDyS-2, Asteroids—Dynamic Site
- 100 Hekate at the JPL Small-Body Database
