SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 ES3

2021 ES3

2021 ES3 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.06 AU it takes 1.09 yr to circle the Sun.

Apollo Observations: 31
Orbital Period · P
1.09 yr
v(q)
33.3 km/s
v(Q)
25.1 km/s
Diameter · ≈
0.01 km
TJ
5.79
Eccentricity · e
0.1409

Orbit and dynamics

Between its closest point (0.911 AU) and its farthest (1.209 AU), the heliocentric distance changes by 0.298 AU over every revolution.

One full revolution takes 1.09 yr (399 days), computed from the semi-major axis of 1.06 AU.

An eccentricity of 0.141 makes the orbit moderately elongated.

The orbital plane is tilted 11.19° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.3 km/s at perihelion and falls to 25.1 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 = 27.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 31 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5188 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
1.06 AU
Eccentricity
0.1409
Perihelion
0.911 AU
Aphelion
1.209354 AU
Inclination
11.19°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
351.11°

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
2031-Sep-21 00:05 0.215730 AU
32272800 km
12.14 km/s
2033-Mar-11 09:32 0.017644 AU
2639552 km
7.81 km/s
2043-Sep-24 08:39 0.108760 AU
16270212 km
8.62 km/s
2044-Jun-15 17:00 0.287916 AU
43071637 km
4.20 km/s
2045-Mar-18 10:34 0.192692 AU
28826254 km
11.44 km/s
2055-Sep-21 22:26 0.059107 AU
8842314 km
6.44 km/s
2057-Mar-24 14:28 0.265488 AU
39716500 km
14.96 km/s
2066-Sep-15 20:38 0.257459 AU
38515383 km
16.48 km/s
2068-Mar-05 15:03 0.071009 AU
10622749 km
5.89 km/s
2069-Mar-30 22:07 0.311955 AU
46667796 km
18.78 km/s
2078-Sep-19 13:50 0.156038 AU
23342966 km
13.37 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
27.6

Orbit Quality

RMS
0.51882
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.

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