93 Minerva
.png) 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 | |
| (93) Minerva | |
| Pronunciation | /mɪˈnɜːrvə/[1] |
Named after | Minerva |
| 1949 QN2, A902 DA | |
| Main belt | |
| Adjectives | Minervian, Minervean /mɪˈnɜːrviən/ |
| Orbital characteristics[2] | |
| 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° | |
| Physical characteristics | |
| 154.155±1.298 km (IRAS)[2] 156 km[3] | |
| Mass | 3.8×1018 kg (calculated)[a] |
Mean density | 1.9 g/cm3[3] |
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)[2] | |
| 0.056±0.008[2] | |
| C[2] G?[3] | |
| 7.91[2] | |
93 Minerva 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 24 August 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 22 November 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.[5][6]
Satellites
[edit]On 16 August 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[8] (/ˈiːdʒɪs/)[9] and Gorgoneion[8] (/ˌɡɔːrɡəˈnaɪən/).[10]
Notes
[edit]- ^ Using a spherical radius of 78 km; volume of a sphere * density of 1.9 g/cm3 yields a mass (m=d*v) of 3.78E+18 kg
References
[edit]- ^ Noah Webster (1884) A Practical Dictionary of the English Language
- ^ a b c d e f "JPL Small-Body Database Browser: 93 Minerva" (2011-12-29 last obs). Jet Propulsion Laboratory. Retrieved 13 May 2016.
- ^ a b c Franck Marchis (7 October 2011). "Is the triple Asteroid Minerva a baby-Ceres?". NASA blog (Cosmic Diary). Retrieved 28 January 2012.
- ^ a b "HEC:Exoplanets Calculator/Planet Density, Surface Gravity, and Escape Velocity". Planetary Habitability Laboratory. University of Puerto Rico at Arecibo. Archived from the original on 24 August 2017. Retrieved 10 January 2014.
- ^ Millis, R.L; Wasserman, L.H; Bowell, E; Franz, O.G; Nye, R; Osborn, W; Klemola, A (1985), "The occultation of AG+29°398 by 93 Minerva", Icarus, 61 (1): 124–131, Bibcode:1985Icar...61..124M, doi:10.1016/0019-1035(85)90159-9, hdl:2060/19840022996
- ^ "Observed minor planet occultation events". astro.cz. 26 July 2005. Retrieved 3 September 2020.
- ^ a b Franck Marchis (21 August 2009). "The discovery of a new triple asteroid, (93) Minerva". Cosmic Diary Blog. Retrieved 25 October 2009.
- ^ a b Franck Marchis (26 December 2013). "Asteroid Minerva finds its magical weapons in the sky". The Planetary Society. Retrieved 7 April 2023.
- ^ "aegis". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 23 March 2020.
- ^ "gorgoneion". Lexico UK English Dictionary UK English Dictionary. Oxford University Press. Archived from the original on 23 March 2020.
External links
[edit]- 93 Minerva at AstDyS-2, Asteroids—Dynamic Site
- 93 Minerva at the JPL Small-Body Database
