Ceres (dwarf planet)

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.

Ceres

A view o Ceres in naitural colour, picturt bi the Dawn spacecraft in Mey 2015.[a]
Discovery[1]
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[3]
Epoch 2013-Nov-04 (JD 7006245660050000000♠2456600.5)
Aphelion	7011445280000000000♠445280000 km (7011445278062138550♠2.9765 AU)
Perihelion	7011382520000000000♠382520000 km (7011382521755379899♠2.5570 AU)
Semi-major axis	7011413910000000000♠413910000 km (7011413907388652760♠2.7668 AU)
Eccentricity	6998757970000000000♠0.075797
Orbital period	4.60 yr 1680.99 d
Synodic period	466.7 d 1.278 yr
Average orbital speed	7004178820000000000♠17.882 km/s
Mean anomaly	6999184254409133041♠10.557°
Inclination	6999184882727663759♠10.593° tae Ecliptic 9.20° tae Invariable plane[4]
Longitude o ascendin node	7000140198110022500♠80.3276°
Argument o perihelion	7000126173516818099♠72.2921°
Satellites	None
Proper orbital elements[5]
Proper semi-major axis	7000276709620000000♠2.7670962 AU
Proper eccentricity	6999116197700000000♠0.1161977
Proper inclination	6999168379107187070♠9.6474122°
Proper mean motion	78.193318 deg / yr
Proper orbital period	4.60397 yr (1681.601 d)
Precession o perihelion	7001540702720000000♠54.070272 arcsec / yr
Precession of the ascending node	2998408299660000000♠−59.170034 arcsec / yr
Pheesical chairacteristics
Mean radius	476.2 ± ?? km[6]
Equatorial radius	7005487300000000000♠487.3±1.8 km[7]
Polar radius	7005454700000000000♠454.7±1.6 km[7]
Surface area	7012285000000000000♠2850000 km2
Mass	7020943000000000000♠(9.43±0.07)×1020 kg,[8] 9.47±??[6] 6996150000000000000♠0.00015 Yirds 0.0128 Muins
Mean density	7003207700000000000♠2.077±0.036 g/cm3,[7] 2.09±??[6]
Surface gravity	0.28 m/s2[6] 0.029 g
Escape velocity	0.51 km/s[9]
Sidereal rotation period	7004326678400000000♠0.3781 d 7004326670120000000♠9.074170±0.000002 h[10]
Axial tilt	≈ 3°[7]
North pole right ascension	19h 24m 291°[7]
North pole declination	59°[7]
Albedo	6998900000000000000♠0.090±0.0033 (V-band geometric)[11]
Surface temp. min mean max Kelvin ? ≈ 168 K[12] 235 K[13]
Spectral teep	C[14]
Apparent magnitude	6.64[15] tae 9.34[16]
Absolute magnitude (H)	7000336000000000000♠3.36±0.02[11]
Angular diameter	0.854″ to 0.339″

Notes

1. This image wis taken bi the Dawn spacecraft on 2 Mey 2015, during a "rotation chairacterisation" orbit, 13,642 kilometre (8,477 mi) abuin the surface o Ceres. Veesible at centre an centre richt are twa bricht spots, a phenomenon common on Ceres, in Oxo an Haulani craters respectively. Ahuna Mons is an aa veesible in the image as a noticeable, bluff hill, seen juist richt o bottom.