SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 EE

2021 EE

2021 EE belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.443 AU it takes 1.73 yr to circle the Sun.

Apollo Observations: 84
Orbital Period · P
1.73 yr
v(q)
41 km/s
v(Q)
15 km/s
Diameter · ≈
0.02 km
TJ
4.47
Eccentricity · e
0.4648

Orbit and dynamics

Between its closest point (0.772 AU) and its farthest (2.114 AU), the heliocentric distance changes by 1.342 AU over every revolution.

One full revolution takes 1.73 yr (633 days), computed from the semi-major axis of 1.443 AU.

The high eccentricity (0.465) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 22.01° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 41 km/s at perihelion and falls to 15 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 = 25.81 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 84 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5192 arcseconds.

Condition code U = 7 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
1.443 AU
Eccentricity
0.4648
Perihelion
0.772 AU
Aphelion
2.113706 AU
Inclination
22.01°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
43.38°

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
2027-Sep-22 04:54 0.311964 AU
46669125 km
11.84 km/s
2034-Sep-22 02:34 0.159095 AU
23800326 km
17.82 km/s
2053-Sep-24 20:45 0.205496 AU
30741808 km
12.17 km/s
2060-Sep-17 07:13 0.236385 AU
35362764 km
20.94 km/s
2066-Mar-14 03:06 0.052445 AU
7845676 km
22.34 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
25.81

Orbit Quality

RMS
0.51918
Condition
7
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

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