SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 RL4

2021 RL4

2021 RL4 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.575 AU once every 1.98 yr.

Amor Observations: 21
Orbital Period · P
1.98 yr
v(q)
34.3 km/s
v(Q)
16.4 km/s
Diameter · ≈
0.04 km
TJ
4.3
Eccentricity · e
0.3533

Orbit and dynamics

Between its closest point (1.018 AU) and its farthest (2.131 AU), the heliocentric distance changes by 1.113 AU over every revolution.

One full revolution takes 1.98 yr (722 days), computed from the semi-major axis of 1.575 AU.

An eccentricity of 0.353 makes the orbit moderately elongated.

The orbital plane is tilted 15.36° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.3 km/s at perihelion and falls to 16.4 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 = 24.92 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

Astrometry from 21 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4583 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
1.575 AU
Eccentricity
0.3533
Perihelion
1.018 AU
Aphelion
2.131447 AU
Inclination
15.36°
Orbital Period
— yr
Epoch
2459466.5
Mean Anomaly
341.26°

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
24.92

Orbit Quality

RMS
0.45835
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.

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