SpaceAtlas Space Object Data
NASA JPL SBDB · 513138

513138

513138 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.366 AU it takes 1.60 yr to circle the Sun.

Apollo Observations: 97
Orbital Period · P
1.60 yr
v(q)
38.2 km/s
v(Q)
17 km/s
Diameter · ≈
0.22 km
TJ
4.75
Eccentricity · e
0.3843

Orbit and dynamics

Between its closest point (0.841 AU) and its farthest (1.891 AU), the heliocentric distance changes by 1.05 AU over every revolution.

One full revolution takes 1.60 yr (583 days), computed from the semi-major axis of 1.366 AU.

An eccentricity of 0.384 makes the orbit moderately elongated.

The orbital plane is tilted 8.3° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.2 km/s at perihelion and falls to 17 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 = 21.05 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.22 km.

Observation record and orbit quality

Astrometry from 97 individual observations underpins this orbit; the fit leaves an RMS residual of 0.7013 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
1.366 AU
Eccentricity
0.3843
Perihelion
0.841 AU
Aphelion
1.890954 AU
Inclination
8.3°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
158.82°

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
2033-Jul-29 16:22 0.166600 AU
24923071 km
14.70 km/s
2060-Dec-25 17:50 0.181527 AU
27156101 km
13.50 km/s
2068-Dec-16 20:52 0.138885 AU
20776909 km
9.90 km/s
2076-Nov-23 01:55 0.166721 AU
24941039 km
7.93 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
21.05

Orbit Quality

RMS
0.70127
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.