SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 WK15

2011 WK15

2011 WK15 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.992 AU once every 2.81 yr.

Amor Observations: 476
Orbital Period · P
2.81 yr
v(q)
35.2 km/s
v(Q)
12.7 km/s
Diameter · ≈
0.4 km
TJ
3.7
Eccentricity · e
0.4711

Orbit and dynamics

The path is an ellipse reaching 1.054 AU from the Sun at perihelion and 2.93 AU at aphelion, a radial span of 1.876 AU.

Applying Kepler's third law to a = 1.992 AU gives an orbital period of 2.81 yr, or about 1,027 days.

The high eccentricity (0.471) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 7.02° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.2 km/s at perihelion and falls to 12.7 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 = 19.74 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.4 km.

Observation record and orbit quality

The current orbit solution is based on 476 observations and has a weighted RMS residual of 0.4128 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
1.992 AU
Eccentricity
0.4711
Perihelion
1.054 AU
Aphelion
2.930431 AU
Inclination
7.02°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
3.32°

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
2060-Feb-01 08:09 0.193577 AU
28958770 km
10.59 km/s
2074-Mar-26 05:13 0.191291 AU
28616705 km
8.19 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
19.74

Orbit Quality

RMS
0.41285
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.

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