SpaceAtlas Space Object Data
NASA JPL SBDB · 2010 WD9

2010 WD9

2010 WD9 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.378 AU it takes 1.62 yr to circle the Sun.

Apollo Observations: 63
Orbital Period · P
1.62 yr
v(q)
34.8 km/s
v(Q)
18.5 km/s
Diameter · ≈
0.06 km
TJ
4.76
Eccentricity · e
0.3059

Orbit and dynamics

Between its closest point (0.956 AU) and its farthest (1.8 AU), the heliocentric distance changes by 0.844 AU over every revolution.

One full revolution takes 1.62 yr (591 days), computed from the semi-major axis of 1.378 AU.

An eccentricity of 0.306 makes the orbit moderately elongated.

Its inclination of 2.13° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 34.8 km/s at perihelion and falls to 18.5 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 = 23.76 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

Astrometry from 63 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5047 arcseconds.

Condition code U = 5 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
1.378 AU
Eccentricity
0.3059
Perihelion
0.956 AU
Aphelion
1.79953 AU
Inclination
2.13°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
232.29°

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
2031-Dec-15 07:09 0.077736 AU
11629100 km
8.82 km/s
2044-Sep-15 01:26 0.049843 AU
7456417 km
6.97 km/s
2052-Jul-22 21:59 0.416766 AU
62347299 km
5.24 km/s
2052-Dec-25 02:45 0.234154 AU
35029006 km
13.28 km/s
2065-Sep-16 02:47 0.034861 AU
5215082 km
6.85 km/s
2073-Aug-03 10:40 0.355868 AU
53237083 km
3.91 km/s
2073-Dec-20 07:25 0.139884 AU
20926292 km
10.65 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
23.76

Orbit Quality

RMS
0.50472
Condition
5
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.