Ceres

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Ceres
Ceres is the largest object in the asteroid belt that lies between the orbits of Mars and Jupiter. Its diameter is approximately 945 kilometers, making it the largest of the minor planets within the orbit of Neptune. The thirty-third-largest known body in the Solar System, it is the only one identified orbiting entirely within the orbit of Neptune that is a dwarf planet. Composed of rock and ice, Ceres is estimated to comprise approximately one third of the mass of the entire asteroid belt. Ceres is the only object in the asteroid belt known to be rounded by its own gravity. From Earth, the apparent magnitude of Ceres ranges from 6.7 to 9.3, and hence even at its brightest, it is too dim to be seen with the naked eye, except under extremely dark skies. Ceres (dwarf planet) - Wikipedia, the free encyclopedia
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Additional Information

Short Description Ceres is the largest object in the asteroid belt that lies between the orbits of Mars and Jupiter. Its diameter is approximately 945 kilometers, making it the largest of the minor planets within the orbit of Neptune. The thirty-third-largest known body in the Solar System, it is the only one identified orbiting entirely within the orbit of Neptune that is a dwarf planet. Composed of rock and ice, Ceres is estimated to comprise approximately one third of the mass of the entire asteroid belt. Ceres is the only object in the asteroid belt known to be rounded by its own gravity. From Earth, the apparent magnitude of Ceres ranges from 6.7 to 9.3, and hence even at its brightest, it is too dim to be seen with the naked eye, except under extremely dark skies. Ceres (dwarf planet) - Wikipedia, the free encyclopedia
Discovered by Giuseppe Piazzi
Discovery date 1 January 1801
Type Dwarf planet
AddInfo Asteroid belt
Satellite of Sun
Minor planet number 1
Orbit Prograde
Rotation Direct
Shape Equilibrium spheroid
Apoapsis 09 445 410 000 km
Periapsis 09 382 620 000 km
Semi-major axis 09 414 010 000 km
Distance from Sun 01 2.767 5 au
Eccentricity 0.075 823
Orbital period 4.60 year | 1,681.63 days
Synodic period 466.6 days | 1.278 year
Orbital speed 02 17.905 km/s
Mean anomaly 095.9891°
Inclination to the ecliptic 10.593°
Longitude of the ascending node 080.3293°
Argument of periapsis 072.5220°
Diameter/Size 03 946 km
Dimensions (965.2 × 961.2 × 891.2) ± 2.0 km
Mass 1020×9.393±0.005 kg | 0.0128 Moons
Density 01 2.161±0.009 g/cm3
Surface gravity  0.28 m/s2 | 0.029 g
Escape velocity 03 510 m/s
Rotation period 0.3781 days | 9.074170±0.000002 hour
Equatorial rotation velocity 02 92.61 m/s
Axial tilt 004°
North pole right ascension 294.18°
North pole declination 066.764°
Albedo geometric 0.090
Temperature min 02  K
Temperature mean 03 168 K
Temperature max 03 235 K K
Apparent magnitude 6.64 to 9.34
Absolute magnitude 3.36 ± 0.02
Angular diameter 0.854″ to 0.339″
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