Gaspra

eccentricity

.1737374595425464 ± 1.0832E-9

semi-major axis

2.209978353670737 au ± 5.3617E-10

perihelion distance

1.826022328859964 au ± 2.4852E-9

inclination; angle with respect to x-y ecliptic plane

4.10465496946464 deg ± 5.3222E-8

longitude of the ascending node

252.9672913251979 deg ± 8.4325E-7

argument of perihelion

130.0037637381037 deg ± 8.7084E-7

mean anomaly

112.9508716440696 deg ± 4.1682E-7

time of perihelion passage

2460823.997778846732 TDB ± 1.2727E-6

sidereal orbital period

1199.997818895033 d ± 4.367E-7

mean motion

.3000005452772328 deg/d ± 1.0918E-10

aphelion distance

2.593934378481511 au ± 6.2932E-10

absolute magnitude

11.49

diameter

12.2 km

extent

18.2x10.5x8.9 km

rotation period

7.042 h

geometric albedo

0.246 ± 0.032

B-V

0.870 ± 0.030

U-B

0.554 ± 0.049

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.