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93 Minerva

93 Minerva
A three-dimensional model of 93 Minerva based on its light curve.
Discovery
Discovered byJames Craig Watson
Discovery siteAnn Arbor, Michigan
Discovery date24 August 1867
Designations
(93) Minerva
Pronunciation/mɪˈnɜːrvə/[1]
Named after
Minerva
1949 QN2, A902 DA
Main belt
AdjectivesMinervian, Minervean /mɪˈnɜːrviən/
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc146.14 yr (53379 d)
Aphelion3.1429 AU (470.17 Gm)
Perihelion2.3711 AU (354.71 Gm)
2.7570 AU (412.44 Gm)
Eccentricity0.13998
4.58 yr (1672.0 d)
~17.86 km/s
262.022°
0° 12m 55.116s / day
Inclination8.56143°
4.06265°
274.543°
Physical characteristics
154.155±1.298 km (IRAS)[2]
156 km[3]
Mass3.8×1018 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

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

  1. ^ 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

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ 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.
  3. ^ a b c Franck Marchis (7 October 2011). "Is the triple Asteroid Minerva a baby-Ceres?". NASA blog (Cosmic Diary). Retrieved 28 January 2012.
  4. ^ 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.
  5. ^ 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
  6. ^ "Observed minor planet occultation events". astro.cz. 26 July 2005. Retrieved 3 September 2020.
  7. ^ a b Franck Marchis (21 August 2009). "The discovery of a new triple asteroid, (93) Minerva". Cosmic Diary Blog. Retrieved 25 October 2009.
  8. ^ a b Franck Marchis (26 December 2013). "Asteroid Minerva finds its magical weapons in the sky". The Planetary Society. Retrieved 7 April 2023.
  9. ^ "aegis". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 23 March 2020.
  10. ^ "gorgoneion". Lexico UK English Dictionary UK English Dictionary. Oxford University Press. Archived from the original on 23 March 2020.
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