SpaceAtlas Space Object Data
NASA JPL SBDB · 516868

516868

516868 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.773 AU once every 2.36 yr.

Amor Observations: 167
Orbital Period · P
2.36 yr
v(q)
34.3 km/s
v(Q)
14.6 km/s
Diameter · ≈
0.54 km
TJ
3.7
Eccentricity · e
0.4032

Orbit and dynamics

Between its closest point (1.058 AU) and its farthest (2.488 AU), the heliocentric distance changes by 1.43 AU over every revolution.

One full revolution takes 2.36 yr (862 days), computed from the semi-major axis of 1.773 AU.

The high eccentricity (0.403) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 44.65° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 34.3 km/s at perihelion and falls to 14.6 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 19.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.54 km.

Observation record and orbit quality

Astrometry from 167 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5027 arcseconds.

Condition code U = 0 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.

About these computed values

Orbital periods, perihelion and aphelion speeds, and diameter estimates on this page are computed by SpaceAtlas from the JPL SBDB orbital elements. They are derived quantities, not values copied from the source catalogue.

Orbital Parameters

Semi-Major Axis
1.773 AU
Eccentricity
0.4032
Perihelion
1.058 AU
Aphelion
2.487874 AU
Inclination
44.65°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
120.62°

Orbit diagram

The Sun sits at the focus (orange). Earth's orbit is the grey circle at 1 AU. The red dot marks the object's position at the catalog epoch.

3D orbit (interactive)

Drag to rotate; scroll or pinch to zoom. The Sun is at the focus (orange), Earth's orbit is the grey ring at 1 AU, and the red dot marks the object's current position.

Close approaches

Predicted close approaches to Earth, from NASA's Center for Near-Earth Object Studies (CNEOS).

Date (UTC)Miss distanceVelocity
2030-Apr-02 05:49 0.428529 AU
64107053 km
29.09 km/s
2037-Apr-13 11:53 0.250362 AU
37453569 km
23.24 km/s
2063-Apr-10 15:46 0.226272 AU
33849827 km
24.73 km/s
2070-Apr-17 10:16 0.481020 AU
71959556 km
22.05 km/s

Distances in astronomical units (AU) and kilometres. Source: NASA/JPL CNEOS Close Approach Data API.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
19.1

Orbit Quality

RMS
0.50266
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database · NASA CNEOS. Orbital periods, perihelion and aphelion speeds, and diameter estimates on this page are computed by SpaceAtlas from the JPL SBDB orbital elements. They are derived quantities, not values copied from the source catalogue.

Keep exploring

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