94 Aurora

94 AuroraFile:94 Aurora.png

A three-dimensional model of 94 Aurora based on its light curve on the top with the image of the asteroid on the bottom.

Discovery
Discovered by| James Craig Watson
Discovery date| 6 September 1867
Designations

MPC designation

| (94) Aurora
Pronunciation| /əˈrɔːrə, ɒ-/[1]
Named after| Aurōra
Minor planet category| 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)
|{{{apsis}}}|helion}}| 3.45175 astronomical unit|AU (516.374 Gm)
|{{{apsis}}}|helion}}| 2.86831 AU (429.093 Gm)

Semi-major axis

| 3.16003 AU (472.734 Gm)
Eccentricity| 0.092315
Orbital period| 5.62 yr (2051.8 d)
Average Orbital speed| 16.73 km/s
Mean anomaly| 132.718°
Mean motion| 0° 10m 31.638s / day
Inclination| 7.97343°
Longitude of ascending node| 2.59859°

|{{{apsis}}}|helion}}

| 60.8260°
Physical characteristics
Dimensions| 225 × 173 km[4]
Mean diameter| 204.89±3.6 km (IRAS)[3]
Mass| (6.606 ± 2.584/2.173)×1018 kg[5]
Mean density| 1.676 ± 0.655/0.551 g/cm3[5][lower-alpha 1]

Equatorial surface gravity

| 0.042 m/s²

Equatorial escape velocity

| 0.0928 km/s
Rotation period| 7.22 h (0.301 d)[3]
Geometric albedo| 0.0395±0.001[3]
0.0395[6]
Physics| ~157 K

Spectral type

| C[3]
Absolute magnitude (H)| 7.74[3]

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.[4] The asteroid's pole of rotation lies just 4–16° away from the plane of the ecliptic.[7]

## Notes

1. ↑ Assuming a diameter of 196 ± 4 km.

## References

1. ↑ aurora (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=aurora (Subscription or UK public library membership required.)
2. ↑ aurorean (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=aurorean (Subscription or UK public library membership required.)
But see 'aurora' for the first vowel.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "JPL Small-Body Database Browser: 94 Aurora". https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=94.
4. ↑ 4.0 4.1 "Occultation of TYC 6910-01938-1 by (94) Aurora - 2001 October 12". Royal Astronomical Society of New Zealand. http://occsec.wellington.net.nz/planet/2001/plnres01.htm#Aurora. (Chords)
5. ↑ 5.0 5.1 Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society 492 (1): 589–602. doi:10.1093/mnras/stz3407. https://academic.oup.com/mnras/article/492/1/589/5658701.
6. ↑ Asteroid Data Sets
7. ↑ Marciniak, A. et al. (May 2011), "Photometry and models of selected main belt asteroids. VIII. Low-pole asteroids", Astronomy & Astrophysics 529: 14, doi:10.1051/0004-6361/201015365, A107, Bibcode: 2011A&A...529A.107M

## External links

* 94 Aurora at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 94 Aurora at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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