SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 MN4

2011 MN4

2011 MN4 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.412 AU once every 3.75 yr.

Amor Observations: 34
Orbital Period · P
3.75 yr
v(q)
32.4 km/s
v(Q)
11.4 km/s
Diameter · ≈
0.16 km
TJ
3.34
Eccentricity · e
0.4812

Orbit and dynamics

The path is an ellipse reaching 1.251 AU from the Sun at perihelion and 3.573 AU at aphelion, a radial span of 2.322 AU.

Applying Kepler's third law to a = 2.412 AU gives an orbital period of 3.75 yr, or about 1,368 days.

The high eccentricity (0.481) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 8.27° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.4 km/s at perihelion and falls to 11.4 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 = 21.8 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.16 km.

Observation record and orbit quality

The current orbit solution is based on 34 observations and has a weighted RMS residual of 0.6525 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
2.412 AU
Eccentricity
0.4812
Perihelion
1.251 AU
Aphelion
3.572654 AU
Inclination
8.27°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
346.74°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
21.8

Orbit Quality

RMS
0.65246
Condition
6
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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.