SpaceAtlas Space Object Data
NASA JPL SBDB · 518463

518463

518463 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.639 AU once every 4.29 yr.

Amor Observations: 1,044
Orbital Period · P
4.29 yr
v(q)
34.6 km/s
v(Q)
9.7 km/s
Diameter · ≈
1.43 km
TJ
3.09
Eccentricity · e
0.5614

Orbit and dynamics

The path is an ellipse reaching 1.158 AU from the Sun at perihelion and 4.121 AU at aphelion, a radial span of 2.963 AU.

Applying Kepler's third law to a = 2.639 AU gives an orbital period of 4.29 yr, or about 1,566 days.

The high eccentricity (0.561) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 18.23° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.6 km/s at perihelion and falls to 9.7 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 = 16.97 and an assumed geometric albedo of 0.14, the diameter works out to roughly 1.43 km.

Observation record and orbit quality

The current orbit solution is based on 1,044 observations and has a weighted RMS residual of 0.3963 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
2.639 AU
Eccentricity
0.5614
Perihelion
1.158 AU
Aphelion
4.120535 AU
Inclination
18.23°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
303.01°

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
2065-Jul-31 20:54 0.178346 AU
26680150 km
11.67 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
16.97

Orbit Quality

RMS
0.39632
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.