SpaceAtlas Space Object Data
NASA JPL SBDB · 2026 ON

2026 ON

2026 ON belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.279 AU it takes 1.45 yr to circle the Sun.

Apollo Observations: 40
Orbital Period · P
1.45 yr
v(q)
38.7 km/s
v(Q)
17.9 km/s
Diameter · ≈
0.12 km
TJ
4.98
Eccentricity · e
0.3676

Orbit and dynamics

The path is an ellipse reaching 0.809 AU from the Sun at perihelion and 1.749 AU at aphelion, a radial span of 0.94 AU.

Applying Kepler's third law to a = 1.279 AU gives an orbital period of 1.45 yr, or about 528 days.

An eccentricity of 0.368 makes the orbit moderately elongated.

The orbital plane is tilted 9.61° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.7 km/s at perihelion and falls to 17.9 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 = 22.39 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.12 km.

Observation record and orbit quality

The current orbit solution is based on 40 observations and has a weighted RMS residual of 0.9289 arcseconds.

Condition code U = 0 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
1.279 AU
Eccentricity
0.3676
Perihelion
0.809 AU
Aphelion
1.74916 AU
Inclination
9.61°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
282.82°

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
2039-Oct-07 04:16 0.195366 AU
29226398 km
10.51 km/s
2052-Oct-27 16:36 0.174448 AU
26097069 km
10.21 km/s
2065-Nov-14 13:11 0.149417 AU
22352501 km
9.78 km/s
2078-Dec-01 19:57 0.127676 AU
19100127 km
10.15 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
22.39

Orbit Quality

RMS
0.92893
Condition
0
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.