SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 ES9

2013 ES9

2013 ES9 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.56 AU once every 1.95 yr.

Amor Observations: 44
Orbital Period · P
1.95 yr
v(q)
29.5 km/s
v(Q)
19.3 km/s
Diameter · ≈
0.15 km
TJ
4.31
Eccentricity · e
0.2094

Orbit and dynamics

Between its closest point (1.234 AU) and its farthest (1.887 AU), the heliocentric distance changes by 0.653 AU over every revolution.

One full revolution takes 1.95 yr (712 days), computed from the semi-major axis of 1.56 AU.

An eccentricity of 0.209 makes the orbit moderately elongated.

A steep inclination of 23.97° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 29.5 km/s at perihelion and falls to 19.3 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 = 21.93 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.15 km.

Observation record and orbit quality

Astrometry from 44 individual observations underpins this orbit; the fit leaves an RMS residual of 0.47 arcseconds.

Condition code U = 6 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
1.56 AU
Eccentricity
0.2094
Perihelion
1.234 AU
Aphelion
1.886664 AU
Inclination
23.97°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
300.19°

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
2050-Feb-21 21:11 0.284900 AU
42620501 km
13.01 km/s
2054-Mar-10 00:54 0.333903 AU
49951206 km
12.72 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
21.93

Orbit Quality

RMS
0.46999
Condition
6
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.