SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 RS4

2020 RS4

2020 RS4 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.816 AU once every 2.45 yr.

Amor Observations: 54
Orbital Period · P
2.45 yr
v(q)
35.4 km/s
v(Q)
13.8 km/s
Diameter · ≈
0.06 km
TJ
3.92
Eccentricity · e
0.439

Orbit and dynamics

Between its closest point (1.019 AU) and its farthest (2.613 AU), the heliocentric distance changes by 1.594 AU over every revolution.

One full revolution takes 2.45 yr (894 days), computed from the semi-major axis of 1.816 AU.

The high eccentricity (0.439) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 7.24° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.4 km/s at perihelion and falls to 13.8 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 = 23.76 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

Astrometry from 54 individual observations underpins this orbit; the fit leaves an RMS residual of 0.518 arcseconds.

Condition code U = 5 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
1.816 AU
Eccentricity
0.439
Perihelion
1.019 AU
Aphelion
2.613224 AU
Inclination
7.24°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
97.31°

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
2042-Dec-17 18:32 0.151345 AU
22640878 km
8.26 km/s
2047-Sep-21 03:32 0.454787 AU
68035184 km
20.17 km/s
2065-Jan-05 20:16 0.327101 AU
48933546 km
16.11 km/s
2069-Oct-05 04:47 0.199976 AU
29915965 km
12.86 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
23.76

Orbit Quality

RMS
0.51802
Condition
5
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.