SpaceAtlas Space Object Data
NASA JPL SBDB · 513181

513181

513181 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.117 AU it takes 1.18 yr to circle the Sun.

Apollo Observations: 147
Orbital Period · P
1.18 yr
v(q)
42.3 km/s
v(Q)
18.8 km/s
Diameter · ≈
0.3 km
TJ
5.48
Eccentricity · e
0.3853

Orbit and dynamics

The path is an ellipse reaching 0.686 AU from the Sun at perihelion and 1.547 AU at aphelion, a radial span of 0.861 AU.

Applying Kepler's third law to a = 1.117 AU gives an orbital period of 1.18 yr, or about 431 days.

An eccentricity of 0.385 makes the orbit moderately elongated.

The orbital plane is tilted 16.7° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 42.3 km/s at perihelion and falls to 18.8 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 = 20.37 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.3 km.

Observation record and orbit quality

The current orbit solution is based on 147 observations and has a weighted RMS residual of 0.5777 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
1.117 AU
Eccentricity
0.3853
Perihelion
0.686 AU
Aphelion
1.54738 AU
Inclination
16.7°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
108.3°

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
2049-Jul-24 06:04 0.197433 AU
29535609 km
13.49 km/s
2051-Jan-20 00:42 0.152856 AU
22866933 km
14.78 km/s
2062-Jul-10 12:48 0.194198 AU
29051560 km
15.02 km/s
2064-Jan-20 14:16 0.169661 AU
25380920 km
12.12 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
20.37

Orbit Quality

RMS
0.57769
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.