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94 Aurora

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Main-belt asteroid

94 Aurora
A three-dimensional model of 94 Aurora based on its light curve.
Discovery
Discovered byJames Craig Watson
Discovery date6 September 1867
Designations
MPC designation(94) Aurora
Pronunciation/əˈrɔːrə, ɒ-/
Named afterAurōra
Minor planet categoryMain belt
AdjectivesAurorean /ɔːˈrɔːriən/
Orbital characteristics
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc143.72 yr (52494 d)
Aphelion3.45175 AU (516.374 Gm)
Perihelion2.86831 AU (429.093 Gm)
Semi-major axis3.16003 AU (472.734 Gm)
Eccentricity0.092315
Orbital period (sidereal)5.62 yr (2051.8 d)
Average orbital speed16.73 km/s
Mean anomaly132.718°
Mean motion0° 10 31.638 / day
Inclination7.97343°
Longitude of ascending node2.59859°
Argument of perihelion60.8260°
Physical characteristics
Dimensions225 × 173 km
Mean diameter204.89±3.6 km (IRAS)
Mass(6.606 ± 2.584/2.173)×10 kg
Mean density1.676 ± 0.655/0.551 g/cm
Equatorial surface gravity0.042 m/s²
Equatorial escape velocity0.0928 km/s
Synodic rotation period7.22 h (0.301 d)
Geometric albedo0.0395±0.001
0.0395
Temperature~157 K
Spectral typeC
Absolute magnitude (H)7.74

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 composition 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.

This asteroid is orbiting the Sun with a period of 5.62 years and a relatively low eccentricity of 0.092. It is spinning with a rotation period of 7.22 hours. Observations of an occultation using nine chords indicate an oval outline of 225×173 km. The asteroid's pole of rotation lies just 4–16° away from the plane of the ecliptic.

Notes

  1. Assuming a diameter of 196 ± 4 km.

References

  1. "aurora". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  2. "aurorean". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
    But see 'aurora' for the first vowel.
  3. ^ "JPL Small-Body Database Browser: 94 Aurora" (2008-11-09 last obs). Retrieved 13 May 2016.
  4. ^ "Occultation of TYC 6910-01938-1 by (94) Aurora - 2001 October 12". Royal Astronomical Society of New Zealand. Archived from the original on 19 February 2012. Retrieved 30 November 2008. (Chords) Archived 2008-10-21 at the Wayback Machine
  5. ^ Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society. 492 (1). doi:10.1093/mnras/stz3407.
  6. Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
  7. Marciniak, A.; et al. (May 2011), "Photometry and models of selected main belt asteroids. VIII. Low-pole asteroids", Astronomy & Astrophysics, 529: 14, Bibcode:2011A&A...529A.107M, doi:10.1051/0004-6361/201015365, A107

External links

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