SpaceAtlas Space Object Data
NASA JPL SBDB · 508912

508912

508912 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.981 AU it takes 2.79 yr to circle the Sun.

Apollo Observations: 235
Orbital Period · P
2.79 yr
v(q)
37.6 km/s
v(Q)
11.9 km/s
Diameter · ≈
0.43 km
TJ
3.59
Eccentricity · e
0.5192

Orbit and dynamics

The path is an ellipse reaching 0.953 AU from the Sun at perihelion and 3.01 AU at aphelion, a radial span of 2.057 AU.

Applying Kepler's third law to a = 1.981 AU gives an orbital period of 2.79 yr, or about 1,018 days.

The high eccentricity (0.519) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 24.47° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 37.6 km/s at perihelion and falls to 11.9 km/s at aphelion.

Because q < 1 AU and Q > 1 AU, this orbit geometrically intersects the region of Earth's orbit.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 19.61 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.43 km.

Observation record and orbit quality

The current orbit solution is based on 235 observations and has a weighted RMS residual of 0.489 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
1.981 AU
Eccentricity
0.5192
Perihelion
0.953 AU
Aphelion
3.009535 AU
Inclination
24.47°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
340.7°

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
2032-Jan-25 11:48 0.345447 AU
51678175 km
23.71 km/s
2057-Feb-17 13:12 0.279416 AU
41800017 km
13.53 km/s
2057-Jun-02 10:44 0.435689 AU
65178108 km
11.07 km/s
2071-Feb-05 23:30 0.121364 AU
18155803 km
17.45 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
19.61

Orbit Quality

RMS
0.48902
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.

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