Asteroid · 152830

Dinkinesh

A small asteroid with a contact-binary moon

Lucy’s 2023 flyby revealed that Dinkinesh has a satellite, Selam, made of two joined lobes. Both are visible in the encounter imagery.

152830 Dinkinesh · spacecraft or telescope observation — Lucy view of Dinkinesh and its satellite Selam. NASA/Goddard/SwRI/Johns Hopkins APL · Image source ↗

Measurements

Effective diameter: 0.719 km
Semimajor axis: 2.192 AU
Orbital period: 1,185.197 Earth days

Orbit, physical values and uncertainties

eccentricity: .1126817135846694 ± 3.3552E-8
semi-major axis: 2.191768748791583 au ± 6.882E-9
perihelion distance: 1.944796490396421 au ± 7.2524E-8
inclination; angle with respect to x-y ecliptic plane: 2.093117265661373 deg ± 2.1517E-6
longitude of the ascending node: 21.35270512523402 deg ± 9.066E-5
argument of perihelion: 66.91637126596935 deg ± 9.3607E-5
mean anomaly: 29.60751779009531 deg ± 1.7556E-5
time of perihelion passage: 2461103.025723479988 TDB ± 5.8052E-5
sidereal orbital period: 1185.196942073384 d ± 5.5821E-6
mean motion: .3037469868680356 deg/d ± 1.4306E-9
aphelion distance: 2.438741007186746 au ± 7.6575E-9
absolute magnitude: 17.40
diameter: 0.719 km ± 0.024
GM: 3.3e-8 km^3/s^2 ± 0.16e-8
bulk density: 2400 g/cm^3 ± 350
rotation period: 52.67 h ± 0.04

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.

Object reference ↗

Missions & milestones

1 launches · 10 connected events

These are target-related flights and every connected programme record in the production catalogue. A connected event may concern another stage or target of the same journey. Launch outcome does not establish arrival or current operation.

CONNECTED EVENT · UPCOMING