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Discovery[1] | |||||||||
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Discovered bi | Giuseppe Piazzi | ||||||||
Discovery date | 1 Januar 1801 | ||||||||
Designations | |||||||||
MPC designation | 1 Ceres | ||||||||
Pronunciation | /ˈsɪəriːz/ SEER-eez | ||||||||
Named after | Cerēs | ||||||||
Alternative names | A899 OF; 1943 XB | ||||||||
Minor planet category | dwarf planet main belt | ||||||||
Adjectives | Cererian /sɨˈrɪəri.ən/ or Cererean /sɛrɨˈriːən/[2] | ||||||||
Orbital chairactereestics[4] | |||||||||
Epoch 2013-Nov-04 (JD 456600.5) 2 | |||||||||
Aphelion | 280000 km 445 (AU) 2.9765 | ||||||||
Perihelion | 520000 km 382 () 2.5570 AU | ||||||||
910000 km 413 () 2.7668 AU | |||||||||
Eccentricity | 797 0.075 | ||||||||
Orbital period | 4.60 yr 1680.99 d | ||||||||
Synodic period | 466.7 d 1.278 yr | ||||||||
Average orbital speed | 17.882 km/s | ||||||||
Mean anomaly | 10.557° | ||||||||
Inclination | tae Ecliptic 10.593° 9.20° tae Invariable plane[3] | ||||||||
Longitude o ascendin node | 80.3276° | ||||||||
Argument o perihelion | 72.2921° | ||||||||
Satellites | None | ||||||||
Proper orbital elements[5] | |||||||||
Proper semi-major axis | 0962 2.767AU | ||||||||
Proper eccentricity | 1977 0.116 | ||||||||
Proper inclination | 4122° 9.647 | ||||||||
Proper mean motion | 78.193318 deg / yr | ||||||||
Proper orbital period | 4.60397 yr (1681.601 d) | ||||||||
Precession o perihelion | 272 arcsec / yr 54.070 | ||||||||
Precession of the ascending node | 034 arcsec / yr −59.170 | ||||||||
Pheesical chairacteristics | |||||||||
Mean radius | 476.2 ± ?? km[6] | ||||||||
Equatorial radius | ±1.8 km 487.3[7] | ||||||||
Polar radius | ±1.6 km 454.7[7] | ||||||||
Surface area | 850000 km2 2 | ||||||||
Mass | ±0.07)×1020 kg, (9.43[8] 9.47±??[6] 15 Yirds 0.000 0.0128 Muins | ||||||||
Mean density | ±0.036 g/cm3, 2.077[7] 2.09±??[6] | ||||||||
Surface gravity | 0.28 m/s2[6] 0.029 g | ||||||||
Escape velocity | 0.51 km/s[9] | ||||||||
Sidereal rotation period | 0.3781 d 170±0.000002 h 9.074[10] | ||||||||
Axial tilt | ≈ 3°[7] | ||||||||
North pole right ascension | 19h 24m 291°[7] | ||||||||
North pole declination | 59°[7] | ||||||||
Albedo | ±0.0033 (V-band geometric) 0.090[11] | ||||||||
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Spectral teep | C[12] | ||||||||
Apparent magnitude | 6.64[13] tae 9.34[14] | ||||||||
±0.02 3.36[11] | |||||||||
Angular diameter | 0.854″ to 0.339″ | ||||||||
Ceres (minor-planet designation 1 Ceres; seembol: )[17] /ˈsɪəriːz/ (SEER-eez)[18] is the lairgest object in the asteroid belt, which lies atween the orbits o Maurs an Jupiter.
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