420 Bertholda

420 Bertholda is a very large main-belt asteroid. It was discovered by Max Wolf on September 7, 1896, in Heidelberg, Germany. The object is part of the Cybele asteroid group,^[3] and is classified as a P-type asteroid.

420 Bertholda

Discovery
Discovered by	Max Wolf
Discovery date	7 September 1896
Designations
MPC designation	(420) Bertholda
Alternative designations	1896 CY
Minor planet category	Main belt (Cybele)
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	115.96 yr (42353 d)
Aphelion	3.5216 AU (526.82 Gm)
Perihelion	3.3110 AU (495.32 Gm)
Semi-major axis	3.4163 AU (511.07 Gm)
Eccentricity	0.030818
Orbital period (sidereal)	6.31 yr (2306.4 d)
Mean anomaly	220.0218°
Mean motion	0° 9m 21.924s / day
Inclination	6.6874°
Longitude of ascending node	242.661°
Argument of perihelion	236.020°
Earth MOID	2.33214 AU (348.883 Gm)
Jupiter MOID	1.58341 AU (236.875 Gm)
TJupiter	3.132
Physical characteristics
Dimensions	141.25±6.9 km[1] 141.54 ± 2.08 km[2]
Mass	(1.48 ± 0.09) × 1019 kg[2]
Mean density	9.96 ± 0.75 g/cm3[2]
Synodic rotation period	11.04 h (0.460 d)
Geometric albedo	0.0420±0.004
Spectral type	P
Absolute magnitude (H)	8.3