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5 Astraea
asteroid / From Wikipedia, the free encyclopedia
5 Astraea is a lairge asteroid frae the asteroid belt.
Quick Facts Discovery, Discovered bi ...
![]() A three-dimensional model o Astraea based on its licht curve. | |
Discovery | |
---|---|
Discovered bi | Karl Ludwig Hencke |
Discovery date | December 8, 1845 |
Designations | |
Pronunciation | /æˈstriːə/ a-STREE-ə |
Named after | Astraea |
Alternative names | 1969 SE |
Minor planet category | Main belt |
Adjectives | Astraean |
Orbital chairactereestics | |
Epoch November 26, 2005 (JD 2453700.5) | |
Aphelion | 3.070 AU (459.202 Gm) |
Perihelion | 2.077 AU (310.688 Gm) |
2.573 AU (384.945 Gm) | |
Eccentricity | 0.193 |
Orbital period | 4.13 a (1507.676 d) |
Average orbital speed | 18.39 km/s |
Mean anomaly | 194.442° |
Inclination | 5.369° |
Longitude o ascendin node | 141.690° |
Argument o perihelion | 357.530° |
Proper orbital elements[1] | |
Proper semi-major axis | 2.5761849 AU |
Proper eccentricity | 0.1980486 |
Proper inclination | 4.5118628° |
Proper mean motion | 87.046396 deg / yr |
Proper orbital period | 4.13573 yr (1510.574 d) |
Precession o perihelion | 52.210903 arcsec / yr |
Precession of the ascending node | −57.357951 arcsec / yr |
Pheesical chairacteristics | |
Dimensions | 167×123×82 km[2][3] 119 km (mean) |
Mass | 2.9×1018 kg[4][5] (assumed)[6] |
Mean density | ~3.3 g/cm³ |
Surface gravity | ~0.023 m/s² |
Escape velocity | ~0.062 km/s |
0.700 03 d (16.801 h)[3] | |
Albedo | 0.227 (geometric)[2] |
Temperatur | ~167 K max: 263 K (-10 °C) |
Spectral teep | S-type asteroid |
Apparent magnitude | 8.74 tae 12.89 |
6.85 | |
Angular diameter | 0.15" tae 0.041" |
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