Psyche

eccentricity

.1349324738201893 ± 2.963E-9

semi-major axis

2.925720466462538 au ± 2.8949E-9

perihelion distance

2.53094576621639 au ± 9.9504E-9

inclination; angle with respect to x-y ecliptic plane

3.098749116151128 deg ± 2.96E-7

longitude of the ascending node

149.9753859305033 deg ± 6.0558E-6

argument of perihelion

230.0326782748359 deg ± 6.1737E-6

mean anomaly

79.76939505329617 deg ± 1.8216E-6

time of perihelion passage

2460795.475337075717 TDB ± 8.8496E-6

sidereal orbital period

1827.87996016922 d ± 2.713E-6

mean motion

.1969494758105845 deg/d ± 2.9232E-10

aphelion distance

3.320495166708687 au ± 3.2856E-9

absolute magnitude

6.20

magnitude slope

0.20

diameter

222 km ± -1/+4

extent

278 x 238 x 171 km ± 6 x 5 x 3

GM

1.601 km^3/s^2 ± 0.017

bulk density

4.172 g/cm^3 ± 0.145

rotation period

4.196 h

geometric albedo

0.1203 ± 0.004

B-V

0.729 ± 0.023

U-B

0.299 ± 0.058

Tholen spectral type

M

SMASSII spectral type

X

Published JPL orbital elements describe their stated epoch; they are not current positions. Small-body diameters can be effective/model-dependent sizes, not spherical shapes. Missing measurements remain unavailable. Pluto’s diameter uses the New Horizons reference rather than an empty SBDB field. Orbital epoch: JD 2461200.5 TDB.