Ida

eccentricity

.04610962795708528 ± 1.0226E-9

semi-major axis

2.863348031699649 au ± 1.7807E-9

perihelion distance

2.731320119246325 au ± 4.0912E-9

inclination; angle with respect to x-y ecliptic plane

1.130363094271507 deg ± 6.2439E-8

longitude of the ascending node

323.5366609419851 deg ± 3.9529E-6

argument of perihelion

113.2571826848795 deg ± 4.3509E-6

mean anomaly

49.64769088009876 deg ± 2.059E-6

time of perihelion passage

2460956.434615665439 TDB ± 9.9299E-6

sidereal orbital period

1769.740682857457 d ± 1.6509E-6

mean motion

.2034196328801896 deg/d ± 1.8976E-10

aphelion distance

2.995375944152972 au ± 1.8628E-9

absolute magnitude

10.06

diameter

32 km

extent

59.8x25.4x18.6 km

GM

0.00275 km^3/s^2 ± 0.00035

bulk density

2.6 g/cm^3 ± 0.5

rotation period

4.634 h

geometric albedo

0.262 ± 0.032

B-V

0.802 ± 0.009

U-B

0.416 ± 0.037

Tholen spectral type

S

SMASSII spectral type

S

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.