SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 SO25

2011 SO25

2011 SO25 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.26 AU once every 3.40 yr.

Amor Observations: 72
Orbital Period · P
3.40 yr
v(q)
31.5 km/s
v(Q)
12.4 km/s
Diameter · ≈
0.27 km
TJ
3.49
Eccentricity · e
0.4339

Orbit and dynamics

The path is an ellipse reaching 1.279 AU from the Sun at perihelion and 3.241 AU at aphelion, a radial span of 1.962 AU.

Applying Kepler's third law to a = 2.26 AU gives an orbital period of 3.40 yr, or about 1,241 days.

The high eccentricity (0.434) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 4.2° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 31.5 km/s at perihelion and falls to 12.4 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 = 20.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.27 km.

Observation record and orbit quality

The current orbit solution is based on 72 observations and has a weighted RMS residual of 0.5073 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
2.26 AU
Eccentricity
0.4339
Perihelion
1.279 AU
Aphelion
3.240614 AU
Inclination
4.2°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
108.68°

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
2028-Nov-08 07:02 0.321052 AU
48028697 km
2.38 km/s
2045-Nov-08 18:44 0.309297 AU
46270148 km
2.35 km/s
2062-Nov-09 17:04 0.304642 AU
45573814 km
2.26 km/s
2079-Nov-12 09:57 0.302776 AU
45294673 km
2.14 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
20.6

Orbit Quality

RMS
0.50729
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.

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