Astronomy:94 Aurora
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 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 | |
| (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) |
| 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° |
| 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 |
| 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
- ↑ Assuming a diameter of 196 ± 4 km.
References
- ↑ aurora (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=aurora (Subscription or UK public library membership required.)
- ↑ 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. - ↑ 3.0 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.
- ↑ 4.0 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)
- ↑ 5.0 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.
- ↑ Asteroid Data Sets
- ↑ 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
- 94 Aurora at the JPL Small-Body Database
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