Astronomy:100 Hekate
 orbit | |
| Discovery | |
|---|---|
| Discovered by | J. C. Watson |
| Discovery date | 11 July 1868 |
| Designations | |
| (100) Hekate | |
| Pronunciation | /ˈhɛkətiː/[1] |
| Named after | Hecate |
| 1955 QA | |
| Minor planet category | 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) |
| |{{{apsis}}}|helion}} | 3.61005 astronomical unit|AU (540.056 Gm) |
| |{{{apsis}}}|helion}} | 2.56919 AU (384.345 Gm) |
| 3.08962 AU (462.201 Gm) | |
| Eccentricity | 0.16844 |
| Orbital period | 5.43 yr (1983.6 d) |
| Mean anomaly | 64.6430° |
| Mean motion | 0° 10m 53.357s / day |
| Inclination | 6.42957° |
| Longitude of ascending node | 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 |
| Rotation period | 27.066 h (1.1278 d)[2] 0.5555 d[5] |
| Geometric albedo | 0.1922±0.009[2] 0.192[3] |
| Physics | ~154 K max: 238K (-35°C) |
| S-type asteroid | |
| Absolute magnitude (H) | 7.67 |
Hekate (minor planet designation: 100 Hekate) is a large main-belt asteroid.
About
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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.
See also
References
- ↑ 1.0 1.1 Hecate (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Hecate (Subscription or UK public library membership required.)
- ↑ 2.0 2.1 2.2 2.3 "100 Hekate". JPL Small-Body Database. Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000100.
- ↑ 3.0 3.1 "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.
- ↑ 6.0 6.1 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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