SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 WA

2011 WA

2011 WA is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.845 AU and a period of 0.78 yr.

Aten Observations: 279
Orbital Period · P
0.78 yr
v(q)
43.5 km/s
v(Q)
24.2 km/s
Diameter · ≈
0.16 km
TJ
6.83
Eccentricity · e
0.2857

Orbit and dynamics

Between its closest point (0.603 AU) and its farthest (1.086 AU), the heliocentric distance changes by 0.483 AU over every revolution.

One full revolution takes 0.78 yr (284 days), computed from the semi-major axis of 0.845 AU.

An eccentricity of 0.286 makes the orbit moderately elongated.

A steep inclination of 30.38° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 43.5 km/s at perihelion and falls to 24.2 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 = 21.68 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.16 km.

Observation record and orbit quality

Astrometry from 279 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3433 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
0.8446 AU
Eccentricity
0.2857
Perihelion
0.603 AU
Aphelion
1.085902 AU
Inclination
30.38°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
47.83°

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
2032-Nov-15 20:19 0.182455 AU
27294806 km
15.28 km/s
2056-Nov-12 02:36 0.149177 AU
22316626 km
18.04 km/s
2063-Nov-12 13:24 0.085339 AU
12766550 km
16.86 km/s
2070-Nov-12 13:38 0.050349 AU
7532081 km
16.06 km/s
2077-Nov-13 01:53 0.074255 AU
11108380 km
15.57 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
21.68

Orbit Quality

RMS
0.3433
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.

Keep exploring

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