Astronomy:100 Hekate
_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 | |
| Minor planet category | 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) |
| |{{{apsis}}}|helion}} | 3.60957 astronomical unit|AU (539.984 Gm) |
| |{{{apsis}}}|helion}} | 2.57132 AU (384.664 Gm) |
| 3.09045 AU (462.325 Gm) | |
| Eccentricity | 0.16798 |
| Orbital period | 5.433 yr (1984.4 d) |
| Mean anomaly | 323.244° |
| Mean motion | 0° 10m 53.093s / day |
| Inclination | 6.43092° |
| Longitude of ascending node | 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 |
| Rotation period | 27.066 h (1.1278 d)[3] 0.5555 d[6] |
| Geometric albedo | 0.205±0.01[3] 0.192[4] |
| Physics | ~154 K max: 238K (-35°C) |
| S-type asteroid | |
| Absolute magnitude (H) | 7.67 |
100 Hekate is a large main-belt asteroid.
About
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. However, 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
References
- ↑ "100 Hekate". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=100. Retrieved 23 October 2025.
- ↑ 2.0 2.1 Hecate (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Hecate (Subscription or UK public library membership required.)
- ↑ 3.0 3.1 3.2 3.3 "100 Hekate". JPL Small-Body Database. Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000100.
- ↑ 4.0 4.1 "IRAS Minor Planet Survey". http://www.psi.edu/pds/archive/simps.html.
- ↑ Krasinsky, G. A. (2002). "Hidden Mass in the Asteroid Belt". Icarus 158 (1): 98. doi:10.1006/icar.2002.6837. Bibcode: 2002Icar..158...98K.
- ↑ "Asteroid Lightcurve Parameters". http://www.psi.edu/pds/resource/lc.html.
- ↑ 7.0 7.1 Marciniak, A. et al. (May 2019). "Thermal properties of slowly rotating asteroids: results from a targeted survey". Astronomy & Astrophysics 625: 40. doi:10.1051/0004-6361/201935129. A139. Bibcode: 2019A&A...625A.139M.
- ↑ McDonald, S. L. (1948). "General perturbations and mean elements, with representations of 35 minor planets of the Hecuba group". The Astronomical Journal 53: 199. doi:10.1086/106097. Bibcode: 1948AJ.....53..199M. http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1948AJ.....53..199M&link_type=ARTICLE&db_key=AST&high=.
- ↑ "Discovery Circumstances: Numbered Minor Planets 1–5000". IAU Minor Planet Center. https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html. Retrieved 2013-04-07.
External links
- 100 Hekate at AstDyS-2, Asteroids—Dynamic Site
- 100 Hekate at the JPL Small-Body Database
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