.png) Lightcurve-based 3D-model of Astraea | |
| Discovery[1] | |
|---|---|
| Discovered by | K. L. Hencke |
| Discovery site | Driesen Obs. |
| Discovery date | 8 December 1845 |
| Designations | |
| (5) Astraea | |
| Pronunciation | /æˈstriːə/[2] |
Named after | Astraea (Greek goddess)[3] |
| 1969 SE | |
| main-belt[1][4] · (middle) Astraea[5] | |
| Adjectives | Astraean |
| Symbol | .svg){kind=small} (historical astronomical),  (modern astrological) |
| Orbital characteristics[4] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 171.93 yr (62,799 d) |
| Aphelion | 3.0659 AU |
| Perihelion | 2.0810 AU |
| 2.5735 AU | |
| Eccentricity | 0.1914 |
| 4.13 yr (1,508 d) 4.13 yr (1,508 d) | |
| 186.83° | |
| 0° 14m 19.32s / day | |
| Inclination | 5.3677° |
| 141.58° | |
| 358.75° | |
| Proper orbital elements[6] | |
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 of perihelion | 52.210903 arcsec / yr |
Precession of the ascending node | −57.357951 arcsec / yr |
| Physical characteristics | |
| Dimensions | 169 km × 125 km × 83 km[7] |
| 125 km[7] | |
| 48 900 km2[a] | |
| Volume | 920 000 km3[a] |
| Mass | (2.716 ± 0.326/0.45)×1018 kg[8] |
Mean density | 3.501 ± 0.420/0.581 g/cm3[8][b] |
| 0.700 04 d (16.801 h)[7] | |
Equatorial rotation velocity | 6.49 m/s[a] |
North pole right ascension | 115°/310° ± 5° |
North pole declination | 55° ± 5° |
| 0.227[9] | |
| S | |
| 8.74 to 12.89 | |
| 6.85 | |
| 0.15" to 0.041" | |
5 Astraea (/æˈstriːə/) is an asteroid in the asteroid belt. This object is orbiting the Sun at a distance of 385 million kilometres (2.5735 AU) with a period of 4.13 yr and an orbital eccentricity of 0.19. The orbital plane is inclined at an angle of 5.37° to the plane of the ecliptic. It is spinning with a period of 16.8 h. The surface of Astraea is highly reflective and its composition is probably a mixture of nickel–iron with silicates of magnesium and iron. It is an S-type asteroid in the Tholen classification system.[4]
- ^ a b Cite error: The named reference
MPC-objectwas invoked but never defined (see the help page). - ^ "Astraea". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 22 March 2020.
- ^ Cite error: The named reference
springerwas invoked but never defined (see the help page). - ^ a b c Cite error: The named reference
jpldatawas invoked but never defined (see the help page). - ^ Cite error: The named reference
AstDys-objectwas invoked but never defined (see the help page). - ^ "AstDyS-2 Astraea Synthetic Proper Orbital Elements". Department of Mathematics, University of Pisa, Italy. Retrieved 1 October 2011.
- ^ a b c M. J. López-Gonzáles; E. Rodríguez (2005). "Lightcurves and poles of seven asteroids". Planetary and Space Science. 53: 1147. doi:10.1016/j.pss.2005.04.010.
- ^ a b Cite error: The named reference
FiengaEtAl2020was invoked but never defined (see the help page). - ^ Cite error: The named reference
SIMPSwas invoked but never defined (see the help page).
Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).