SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 CW12

2015 CW12

2015 CW12 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.524 AU once every 1.88 yr.

Amor Observations: 57
Orbital Period · P
1.88 yr
v(q)
33.4 km/s
v(Q)
17.4 km/s
Diameter · ≈
0.09 km
TJ
4.44
Eccentricity · e
0.3139

Orbit and dynamics

Between its closest point (1.046 AU) and its farthest (2.002 AU), the heliocentric distance changes by 0.956 AU over every revolution.

One full revolution takes 1.88 yr (687 days), computed from the semi-major axis of 1.524 AU.

An eccentricity of 0.314 makes the orbit moderately elongated.

The orbital plane is tilted 5.8° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.4 km/s at perihelion and falls to 17.4 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 = 23 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.09 km.

Observation record and orbit quality

Astrometry from 57 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5365 arcseconds.

Condition code U = 6 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
1.524 AU
Eccentricity
0.3139
Perihelion
1.046 AU
Aphelion
2.002384 AU
Inclination
5.8°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
339.37°

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
2030-May-17 14:11 0.232617 AU
34798958 km
10.62 km/s
2032-Feb-21 23:43 0.428404 AU
64088294 km
17.65 km/s
2032-Jul-05 23:45 0.456903 AU
68351734 km
5.33 km/s
2047-Mar-14 01:18 0.076902 AU
11504421 km
7.09 km/s
2062-May-09 11:44 0.136011 AU
20346904 km
7.97 km/s
2079-Mar-06 23:01 0.177616 AU
26571011 km
10.38 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
23.0

Orbit Quality

RMS
0.53654
Condition
6
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.