SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 WP46

2011 WP46

2011 WP46 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.83 AU once every 2.48 yr.

Amor Observations: 49
Orbital Period · P
2.48 yr
v(q)
32.9 km/s
v(Q)
14.8 km/s
Diameter · ≈
0.37 km
TJ
3.77
Eccentricity · e
0.3803

Orbit and dynamics

The path is an ellipse reaching 1.134 AU from the Sun at perihelion and 2.526 AU at aphelion, a radial span of 1.392 AU.

Applying Kepler's third law to a = 1.83 AU gives an orbital period of 2.48 yr, or about 904 days.

An eccentricity of 0.38 makes the orbit moderately elongated.

A steep inclination of 32.12° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 32.9 km/s at perihelion and falls to 14.8 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 = 19.93 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.37 km.

Observation record and orbit quality

The current orbit solution is based on 49 observations and has a weighted RMS residual of 0.589 arcseconds.

Condition code U = 1 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
1.83 AU
Eccentricity
0.3803
Perihelion
1.134 AU
Aphelion
2.525949 AU
Inclination
32.12°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
14.7°

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

Predicted close approaches to Earth, from NASA's Center for Near-Earth Object Studies (CNEOS).

Date (UTC)Miss distanceVelocity
2043-Jun-05 21:44 0.454141 AU
67938459 km
15.78 km/s
2048-Jun-07 14:23 0.321434 AU
48085773 km
16.96 km/s
2053-Jun-05 21:33 0.381613 AU
57088430 km
19.96 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
19.93

Orbit Quality

RMS
0.58896
Condition
1
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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