SpaceAtlas Space Object Data
NASA JPL SBDB · 2003 WC158

2003 WC158

2003 WC158 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.638 AU it takes 4.28 yr to circle the Sun.

Apollo Observations: 125
Orbital Period · P
4.28 yr
v(q)
38.3 km/s
v(Q)
8.8 km/s
Diameter · ≈
0.3 km
TJ
3.07
Eccentricity · e
0.6278

Orbit and dynamics

The path is an ellipse reaching 0.982 AU from the Sun at perihelion and 4.294 AU at aphelion, a radial span of 3.312 AU.

Applying Kepler's third law to a = 2.638 AU gives an orbital period of 4.28 yr, or about 1,565 days.

The high eccentricity (0.628) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 9.02° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.3 km/s at perihelion and falls to 8.8 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 = 20.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.3 km.

Observation record and orbit quality

The current orbit solution is based on 125 observations and has a weighted RMS residual of 0.472 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
2.638 AU
Eccentricity
0.6278
Perihelion
0.982 AU
Aphelion
4.294136 AU
Inclination
9.02°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
98.4°

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
2033-Nov-13 20:11 0.058807 AU
8797330 km
9.83 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
20.4

Orbit Quality

RMS
0.47199
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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