93 Minerva
|
A three-dimensional model of 93 Minerva based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | James Craig Watson |
| Discovery site | Ann Arbor, Michigan |
| Discovery date | 24 August 1867 |
| Designations | |
Named after | Minerva |
| 1949 QN2, A902 DA | |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 146.14 yr (53379 d) |
| Aphelion | 3.1429 AU (470.17 Gm) |
| Perihelion | 2.3711 AU (354.71 Gm) |
| 2.7570 AU (412.44 Gm) | |
| Eccentricity | 0.13998 |
| 4.58 yr (1672.0 d) | |
Average orbital speed | ~17.86 km/s |
| 262.022° | |
| 0° 12m 55.116s / day | |
| Inclination | 8.56143° |
| 4.06265° | |
| 274.543° | |
| Earth MOID | 1.37394 AU (205.538 Gm) |
| Jupiter MOID | 2.05666 AU (307.672 Gm) |
| Jupiter Tisserand parameter | 3.313 |
| Physical characteristics | |
| Dimensions |
141.55±4.0 km (IRAS)[1] 156km (spherical)[2] |
| Mass | 3.7×1018 kg (assumed)[3] |
Mean density | 1.9 g/cm³[2] |
Equatorial surface gravity | 4.139 cm/s2 (0.004221 g)[4] |
Equatorial escape velocity | 8.035 cm/s[4] |
| 5.982 h (0.2493 d)[1] | |
| 0.0733±0.004[1] | |
| Temperature | ~168 K |
|
C[1] G?[2] | |
| 8.0[1] | |
|
| |
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93 Minerva (/mᵻˈnɜːrvə/ mi-NUR-və) is a large trinary main-belt asteroid. It is a C-type asteroid, meaning that it has a dark surface and possibly a primitive carbonaceous composition. It was discovered by J. C. Watson on August 24, 1867, and named after Minerva, the Roman equivalent of Athena, goddess of wisdom. An occultation of a star by Minerva was observed in France, Spain and the United States on November 22, 1982. An occultation diameter of ~170 km was measured from the observations. Since then two more occultations have been observed, which give an estimated mean diameter of ~150 km for diameter.[5][6]
Satellites
On August 16, 2009, at 13:36 UT, the Keck Observatory's adaptive optics system revealed that the asteroid 93 Minerva possesses 2 small moons.[7] They are 4 and 3 km in diameter and the projected separations from Minerva correspond to 630 km (8.8 x Rprimary) and 380 km (5.2 x Rprimary) respectively.[7] They have been named Aegis and Gorgoneion.[8]
References
- 1 2 3 4 5 6 "JPL Small-Body Database Browser: 93 Minerva" (2011-12-29 last obs). Jet Propulsion Laboratory. Retrieved 13 May 2016.
- 1 2 3 Franck Marchis (October 7, 2011). "Is the triple Asteroid Minerva a baby-Ceres?". NASA blog (Cosmic Diary). Retrieved 2012-01-28.
- ↑ Using a spherical radius of 78 km; volume of a sphere * density of 1.9 g/cm³ yields a mass (m=d*v) of 3.77E+18 kg
- 1 2 "HEC:Exoplanets Calculator/Planet Density, Surface Gravity, and Escape Velocity". Planetary Habitability Laboratory. University of Puerto Rico at Arecibo. Retrieved 10 January 2014.
- ↑ The occultation of AG+29°398 by 93 Minerva. R. L. Millis, L. H. Wasserman, E. Bowell, O. G. Franz, R. NyeW. OsbornA. Klemola
- ↑ Observed minor planet occultation events, version of 2005 July 26
- 1 2 Franck Marchis (2009-08-21). "The discovery of a new triple asteroid, (93) Minerva". Cosmic Diary Blog. Retrieved 2009-10-25.
- ↑ M.P.C. 86284
External links
- Orbital simulation from JPL (Java) / Ephemeris
- 93 Minerva at the JPL Small-Body Database
