SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 CW87

2013 CW87

2013 CW87 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.213 AU once every 1.34 yr.

Amor Observations: 40
Orbital Period · P
1.34 yr
v(q)
30.6 km/s
v(Q)
23.9 km/s
Diameter · ≈
0.02 km
TJ
5.24
Eccentricity · e
0.123

Orbit and dynamics

The path is an ellipse reaching 1.064 AU from the Sun at perihelion and 1.362 AU at aphelion, a radial span of 0.298 AU.

Applying Kepler's third law to a = 1.213 AU gives an orbital period of 1.34 yr, or about 488 days.

An eccentricity of 0.123 makes the orbit moderately elongated.

The orbital plane is tilted 6.14° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 30.6 km/s at perihelion and falls to 23.9 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 = 25.87 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

The current orbit solution is based on 40 observations and has a weighted RMS residual of 0.7934 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
1.213 AU
Eccentricity
0.123
Perihelion
1.064 AU
Aphelion
1.362199 AU
Inclination
6.14°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
5.13°

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
2029-Jan-23 09:05 0.108388 AU
16214607 km
3.45 km/s
2033-Jan-12 09:11 0.147618 AU
22083308 km
3.46 km/s
2036-Dec-11 05:24 0.196687 AU
29423882 km
2.07 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
25.87

Orbit Quality

RMS
0.79338
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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