SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 RP4

2020 RP4

2020 RP4 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.669 AU once every 2.16 yr.

Amor Observations: 95
Orbital Period · P
2.16 yr
v(q)
33.3 km/s
v(Q)
16 km/s
Diameter · ≈
0.07 km
TJ
4.17
Eccentricity · e
0.3512

Orbit and dynamics

The path is an ellipse reaching 1.083 AU from the Sun at perihelion and 2.255 AU at aphelion, a radial span of 1.172 AU.

Applying Kepler's third law to a = 1.669 AU gives an orbital period of 2.16 yr, or about 788 days.

An eccentricity of 0.351 makes the orbit moderately elongated.

The orbital plane is tilted 7.57° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.3 km/s at perihelion and falls to 16 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 = 23.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.07 km.

Observation record and orbit quality

The current orbit solution is based on 95 observations and has a weighted RMS residual of 0.5437 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
1.669 AU
Eccentricity
0.3512
Perihelion
1.083 AU
Aphelion
2.255153 AU
Inclination
7.57°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
212.53°

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
2033-Oct-01 07:26 0.406485 AU
60809285 km
14.97 km/s
2034-Jan-06 13:39 0.435060 AU
65084039 km
2.94 km/s
2048-Oct-31 08:33 0.174741 AU
26140855 km
5.76 km/s
2061-Oct-11 20:31 0.184097 AU
27540471 km
9.63 km/s
2076-Nov-16 13:01 0.327476 AU
48989656 km
10.94 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
23.6

Orbit Quality

RMS
0.54368
Condition
6
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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