SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 PN22

2018 PN22

2018 PN22 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.99 AU and a period of 0.98 yr.

Aten Observations: 22
Orbital Period · P
0.98 yr
v(q)
31.2 km/s
v(Q)
28.7 km/s
Diameter · ≈
0.01 km
TJ
6.13
Eccentricity · e
0.0418

Orbit and dynamics

The path is an ellipse reaching 0.948 AU from the Sun at perihelion and 1.031 AU at aphelion, a radial span of 0.083 AU.

Applying Kepler's third law to a = 0.99 AU gives an orbital period of 0.98 yr, or about 360 days.

With e = 0.042, the orbit is close to circular.

Its inclination of 4.43° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 31.2 km/s at perihelion and falls to 28.7 km/s at aphelion.

Because q < 1 AU and Q > 1 AU, this orbit geometrically intersects the region of Earth's orbit.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 27.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

The current orbit solution is based on 22 observations and has a weighted RMS residual of 0.4878 arcseconds.

Condition code U = 3 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
0.9897 AU
Eccentricity
0.0418
Perihelion
0.948 AU
Aphelion
1.031069 AU
Inclination
4.43°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
118.95°

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
2026-Nov-29 11:00 0.431895 AU
64610575 km
14.17 km/s
2079-Aug-05 05:01 0.448108 AU
67036000 km
14.50 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
27.5

Orbit Quality

RMS
0.4878
Condition
3
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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