SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 CE1

2021 CE1

2021 CE1 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.981 AU and a period of 0.97 yr.

Aten Observations: 15
Orbital Period · P
0.97 yr
v(q)
37.1 km/s
v(Q)
24.3 km/s
Diameter · ≈
0.02 km
TJ
6.15
Eccentricity · e
0.2083

Orbit and dynamics

The path is an ellipse reaching 0.777 AU from the Sun at perihelion and 1.186 AU at aphelion, a radial span of 0.409 AU.

Applying Kepler's third law to a = 0.981 AU gives an orbital period of 0.97 yr, or about 355 days.

An eccentricity of 0.208 makes the orbit moderately elongated.

The orbital plane is tilted 6.69° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 37.1 km/s at perihelion and falls to 24.3 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 = 26 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 15 observations and has a weighted RMS residual of 0.3343 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
0.9813 AU
Eccentricity
0.2083
Perihelion
0.777 AU
Aphelion
1.185705 AU
Inclination
6.69°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
278.35°

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
2027-Jun-02 22:14 0.292175 AU
43708690 km
17.06 km/s
2060-Jun-19 08:41 0.079478 AU
11889788 km
8.05 km/s
2061-Jun-09 15:26 0.177466 AU
26548484 km
12.85 km/s
2062-Jun-01 14:39 0.372486 AU
55723157 km
17.83 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
26.0

Orbit Quality

RMS
0.33434
Condition
7
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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