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5 Astraea

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5 Astraea
A three-dimensional model o Astraea based on its licht curve.
Discovery
Discovered biKarl Ludwig Hencke
Discovery dateDecember 8, 1845
Designations
Pronunciation/æˈstriːə/a-STREE-ə
Named after
Astraea
1969 SE
Main belt
AdjectivesAstraean
Orbital chairactereestics
Epoch November 26, 2005 (JD 2453700.5)
Aphelion3.070AU (459.202 Gm)
Perihelion2.077 AU (310.688 Gm)
2.573 AU (384.945 Gm)
Eccentricity0.193
4.13a (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
4.13573yr
(1510.574d)
Precession operihelion
52.210903 arcsec /yr
Precession of theascending node
−57.357951 arcsec /yr
Pheesical chairacteristics
Dimensions167×123×82 km[2][3]
119 km (mean)
Mass2.9×1018 kg[4][5]
(assumed)[6]
~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~167K
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 lairgeasteroid frae theasteroid belt.

    References

    [eedit |eedit soorce]
    1. ↑"AstDyS-2 Astraea Synthetic Proper Orbital Elements". Department of Mathematics, University of Pisa, Italy. Retrieved1 October 2011.
    2. 12"Supplemental IRAS Minor Planet Survey". Archived fraethe original on 23 Juin 2006. Retrieved7 November 2014.
    3. 12M. J. López-Gonzáles & E. RodríguezLightcurves 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. Retrieved10 November 2008.
    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.
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