SpaceAtlas Space Object Data
NASA JPL SBDB · 385343

385343

385343 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.315 AU it takes 3.52 yr to circle the Sun.

Apollo Observations: 1,963
Orbital Period · P
3.52 yr
v(q)
39.5 km/s
v(Q)
9.7 km/s
Diameter · ≈
1.74 km
TJ
3.17
Eccentricity · e
0.6051

Orbit and dynamics

The path is an ellipse reaching 0.914 AU from the Sun at perihelion and 3.716 AU at aphelion, a radial span of 2.802 AU.

Applying Kepler's third law to a = 2.315 AU gives an orbital period of 3.52 yr, or about 1,287 days.

The high eccentricity (0.605) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 29.53° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 39.5 km/s at perihelion and falls to 9.7 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

The measured diameter is 1.36 km, a value from direct size determination rather than from brightness alone.

A geometric albedo of 0.334 points to a comparatively bright, reflective surface.

Observation record and orbit quality

The current orbit solution is based on 1,963 observations and has a weighted RMS residual of 0.4396 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
2.315 AU
Eccentricity
0.6051
Perihelion
0.914 AU
Aphelion
3.715806 AU
Inclination
29.53°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
268.48°

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
2076-Aug-04 13:30 0.010753 AU
1608648 km
20.01 km/s

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

Physical Parameters

Diameter
1.359 km
Albedo
0.334
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
16.55

Orbit Quality

RMS
0.43958
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.