SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 EB4

2021 EB4

2021 EB4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.033 AU it takes 1.05 yr to circle the Sun.

Apollo Observations: 129
Orbital Period · P
1.05 yr
v(q)
61 km/s
v(Q)
14.1 km/s
Diameter · ≈
0.11 km
TJ
5.53
Eccentricity · e
0.6248

Orbit and dynamics

The path is an ellipse reaching 0.387 AU from the Sun at perihelion and 1.678 AU at aphelion, a radial span of 1.291 AU.

Applying Kepler's third law to a = 1.033 AU gives an orbital period of 1.05 yr, or about 383 days.

The high eccentricity (0.625) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 44.74° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 61 km/s at perihelion and falls to 14.1 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 = 22.59 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.11 km.

Observation record and orbit quality

The current orbit solution is based on 129 observations and has a weighted RMS residual of 0.3369 arcseconds.

Condition code U = 8 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
1.033 AU
Eccentricity
0.6248
Perihelion
0.387 AU
Aphelion
1.678418 AU
Inclination
44.74°
Orbital Period
— yr
Epoch
2459287.5
Mean Anomaly
301.59°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
22.59

Orbit Quality

RMS
0.3369
Condition
8
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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.