SpaceAtlas Space Object Data
NASA JPL SBDB · 2019 RN4

2019 RN4

2019 RN4 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.251 AU once every 3.38 yr.

Amor Observations: 132
Orbital Period · P
3.38 yr
v(q)
32.5 km/s
v(Q)
12.1 km/s
Diameter · ≈
0.42 km
TJ
3.38
Eccentricity · e
0.4555

Orbit and dynamics

The path is an ellipse reaching 1.226 AU from the Sun at perihelion and 3.276 AU at aphelion, a radial span of 2.05 AU.

Applying Kepler's third law to a = 2.251 AU gives an orbital period of 3.38 yr, or about 1,234 days.

The high eccentricity (0.456) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 24.13° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 32.5 km/s at perihelion and falls to 12.1 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 = 19.62 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.42 km.

Observation record and orbit quality

The current orbit solution is based on 132 observations and has a weighted RMS residual of 0.4864 arcseconds.

Condition code U = 1 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.

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
2.251 AU
Eccentricity
0.4555
Perihelion
1.226 AU
Aphelion
3.27633 AU
Inclination
24.13°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
358.93°

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
2046-Nov-01 22:29 0.403718 AU
60395283 km
12.88 km/s
2073-Oct-31 09:58 0.412049 AU
61641710 km
13.48 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
19.62

Orbit Quality

RMS
0.48636
Condition
1
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.

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