94 Aurora
Aurora (minor planet designation: 94 Aurora) is one of the largest main-belt asteroids. With an albedo of only 0.04, it is darker than soot, and has a primitive compositions consisting of carbonaceous material. It was discovered by J. C. Watson on September 6, 1867, in Ann Arbor, and named after Aurora, the Roman goddess of the dawn.
- Not to be confused with Aurora borealis.
![]() A three-dimensional model of 94 Aurora based on its light curve. | |
Discovery | |
---|---|
Discovered by | James Craig Watson |
Discovery date | 6 September 1867 |
Designations | |
(94) Aurora | |
Pronunciation | /əˈrɔːrə, ɒ-/[1] |
Named after | Aurōra |
Main belt | |
Adjectives | Aurorean /ɔːˈrɔːriən/[2] |
Orbital characteristics[3] | |
Epoch 31 July 2016 (JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 143.72 yr (52494 d) |
Aphelion | 3.45175 AU (516.374 Gm) |
Perihelion | 2.86831 AU (429.093 Gm) |
3.16003 AU (472.734 Gm) | |
Eccentricity | 0.092315 |
5.62 yr (2051.8 d) | |
Average orbital speed | 16.73 km/s |
132.718° | |
0° 10m 31.638s / day | |
Inclination | 7.97343° |
2.59859° | |
60.8260° | |
Physical characteristics | |
Dimensions | 204.89±3.6 km (IRAS)[3] 225×173 km[4] |
Mass | (6.23 ± 3.64) × 1018 kg[5] |
Mean density | 1.83 ± 1.10[5] g/cm3 |
Equatorial surface gravity | 0.0573 m/s² |
Equatorial escape velocity | 0.1083 km/s |
7.22 h (0.301 d)[3] | |
0.0395±0.001[3] 0.0395[6] | |
Temperature | ~157 K |
C[3] | |
7.57[3] | |
Observations of an occultation using nine chords indicate an oval outline of 225×173 km.[4]
References
- "aurora". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
- "aurorean". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
But see 'aurora' for the first vowel. - "JPL Small-Body Database Browser: 94 Aurora" (2008-11-09 last obs). Retrieved 13 May 2016.
- "Occultation of TYC 6910-01938-1 by (94) Aurora - 2001 October 12". Royal Astronomical Society of New Zealand. Retrieved 30 November 2008. (Chords) Archived 2008-10-21 at the Wayback Machine
- Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
External links
- 94 Aurora at AstDyS-2, Asteroids—Dynamic Site
- 94 Aurora at the JPL Small-Body Database
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