5 Astraea

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5 Astraea 5 Astraea Symbol.svg
5Astraea (Lightcurve Inversion).png
A three-dimensional model o Astraea based on its licht curve.
Discovery
Discovered biKarl Ludwig Hencke
Discovery dateDecember 8, 1845
Designations
Pronunciation/æˈstrə/ a-STREE
Named after
Astraea
1969 SE
Main belt
AdjectivesAstraean
Orbital chairactereestics
Epoch November 26, 2005 (JD 2453700.5)
Aphelion3.070 AU (459.202 Gm)
Perihelion2.077 AU (310.688 Gm)
2.573 AU (384.945 Gm)
Eccentricity0.193
4.13 a (1507.676 d)
18.39 km/s
194.442°
Inclination5.369°
141.690°
357.530°
Proper orbital elements[1]
2.5761849 AU
0.1980486
4.5118628°
87.046396 deg / yr
4.13573 yr
(1510.574 d)
Precession o perihelion
52.210903 arcsec / yr
Precession of the ascending node
−57.357951 arcsec / yr
Pheesical chairacteristics
Dimensions167×123×82 km[2][3]
119 km (mean)
Mass2.9×1018 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]
Albedo0.227 (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]

  1. "AstDyS-2 Astraea Synthetic Proper Orbital Elements". Department of Mathematics, University of Pisa, Italy. Retrieved 2011-10-01. 
  2. 2.0 2.1 Supplemental IRAS Minor Planet Survey
  3. 3.0 3.1 M. J. López-Gonzáles & E. Rodríguez Lightcurves and poles of seven asteroids, Planetary and Space Science, Vol. 53, p. 1147 (2005).
  4. 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 2008-11-10. 
  5. (Mass estimate of Astra 0.015 / Mass of Ceres 4.75) * Mass of Ceres 9.43E+20 = 2.977E+18
  6. Michalak2001 (Table 6) assumed masses of perturbing asteroids used in calculations of perturbations of the test asteroids.