SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 WN2

2011 WN2

2011 WN2 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.397 AU it takes 3.71 yr to circle the Sun.

Apollo Observations: 67
Orbital Period · P
3.71 yr
v(q)
37.9 km/s
v(Q)
9.8 km/s
Diameter · ≈
0.03 km
TJ
3.26
Eccentricity · e
0.59

Orbit and dynamics

Between its closest point (0.983 AU) and its farthest (3.811 AU), the heliocentric distance changes by 2.828 AU over every revolution.

One full revolution takes 3.71 yr (1,355 days), computed from the semi-major axis of 2.397 AU.

The high eccentricity (0.59) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.42° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 37.9 km/s at perihelion and falls to 9.8 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 = 25.2 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 67 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5182 arcseconds.

Condition code U = 7 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
2.397 AU
Eccentricity
0.59
Perihelion
0.983 AU
Aphelion
3.81123 AU
Inclination
5.42°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
327.31°

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
2064-Jan-18 07:59 0.159120 AU
23803964 km
11.98 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
25.2

Orbit Quality

RMS
0.51822
Condition
7
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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