SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 RN21

2013 RN21

2013 RN21 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.43 AU once every 3.79 yr.

Amor Observations: 27
Orbital Period · P
3.79 yr
v(q)
35.9 km/s
v(Q)
10.2 km/s
Diameter · ≈
0.16 km
TJ
3.27
Eccentricity · e
0.5585

Orbit and dynamics

The path is an ellipse reaching 1.073 AU from the Sun at perihelion and 3.787 AU at aphelion, a radial span of 2.714 AU.

Applying Kepler's third law to a = 2.43 AU gives an orbital period of 3.79 yr, or about 1,384 days.

The high eccentricity (0.558) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 4.9° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 35.9 km/s at perihelion and falls to 10.2 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 = 21.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.16 km.

Observation record and orbit quality

The current orbit solution is based on 27 observations and has a weighted RMS residual of 0.8321 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
2.43 AU
Eccentricity
0.5585
Perihelion
1.073 AU
Aphelion
3.787155 AU
Inclination
4.9°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
150.64°

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
21.7

Orbit Quality

RMS
0.83207
Condition
6
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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