SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 OY4

2011 OY4

2011 OY4 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.133 AU once every 3.12 yr.

Amor Observations: 10
Orbital Period · P
3.12 yr
v(q)
32.1 km/s
v(Q)
12.9 km/s
Diameter · ≈
0.05 km
TJ
3.6
Eccentricity · e
0.4254

Orbit and dynamics

The path is an ellipse reaching 1.226 AU from the Sun at perihelion and 3.04 AU at aphelion, a radial span of 1.814 AU.

Applying Kepler's third law to a = 2.133 AU gives an orbital period of 3.12 yr, or about 1,138 days.

The high eccentricity (0.425) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 2.99° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 32.1 km/s at perihelion and falls to 12.9 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 = 24.2 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

The current orbit solution is based on 10 observations and has a weighted RMS residual of 0.2184 arcseconds.

Condition code U = 9 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
2.133 AU
Eccentricity
0.4254
Perihelion
1.226 AU
Aphelion
3.040378 AU
Inclination
2.99°
Orbital Period
— yr
Epoch
2455769.5
Mean Anomaly
2.7°

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
24.2

Orbit Quality

RMS
0.21842
Condition
9
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.