SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 CP

2021 CP

2021 CP belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.239 AU it takes 3.35 yr to circle the Sun.

Apollo Observations: 57
Orbital Period · P
3.35 yr
v(q)
37.3 km/s
v(Q)
10.6 km/s
Diameter · ≈
0.02 km
TJ
3.4
Eccentricity · e
0.5564

Orbit and dynamics

The path is an ellipse reaching 0.993 AU from the Sun at perihelion and 3.485 AU at aphelion, a radial span of 2.492 AU.

Applying Kepler's third law to a = 2.239 AU gives an orbital period of 3.35 yr, or about 1,224 days.

The high eccentricity (0.556) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 9.47° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 37.3 km/s at perihelion and falls to 10.6 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 = 25.95 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 57 observations and has a weighted RMS residual of 0.5247 arcseconds.

Condition code U = 7 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
2.239 AU
Eccentricity
0.5564
Perihelion
0.993 AU
Aphelion
3.48478 AU
Inclination
9.47°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
218.37°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
25.95

Orbit Quality

RMS
0.52474
Condition
7
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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.