5 Astraea
 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 |
| 1969 SE | |
| 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 |
| 4.13 a (1507.676 d) | |
Average orbital speed | 18.39 km/s |
| 194.442° | |
| Inclination | 5.369° |
| 141.690° | |
| 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 |
| ~0.023 m/s² | |
| ~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 |
| 8.74 tae 12.89 | |
| 6.85 | |
| 0.15" tae 0.041" | |
5 Astraea is a lairge asteroid frae the asteroid belt.
References
[eedit | eedit soorce]- ↑ "AstDyS-2 Astraea Synthetic Proper Orbital Elements". Department of Mathematics, University of Pisa, Italy. Retrieved 1 October 2011.
- ↑ a b "Supplemental IRAS Minor Planet Survey". Archived frae the original on 23 Juin 2006. Retrieved 7 November 2014.
- ↑ a b M. J. López-Gonzáles & E. Rodríguez Lightcurves and poles of seven asteroids, Planetary and Space Science, Vol. 53, p. 1147 (2005).
- ↑ Michalak, G. (2001). "Determination of asteroid masses". Astronomy & Astrophysics. 374 (2): 703–711. Bibcode:2001A&A...374..703M. doi:10.1051/0004-6361:20010731. Retrieved 10 November 2008.
- ↑ (Mass estimate of Astra 0.015 / Mass of Ceres 4.75) * Mass of Ceres 9.43E+20 = 2.977E+18
- ↑ Michalak2001 (Table 6) assumed masses of perturbing asteroids used in calculations of perturbations of the test asteroids.