SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 UZ

2021 UZ

2021 UZ is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.395 AU once every 1.65 yr.

Amor Observations: 66
Orbital Period · P
1.65 yr
v(q)
31.7 km/s
v(Q)
20.1 km/s
Diameter · ≈
0.06 km
TJ
4.69
Eccentricity · e
0.2233

Orbit and dynamics

Between its closest point (1.083 AU) and its farthest (1.707 AU), the heliocentric distance changes by 0.624 AU over every revolution.

One full revolution takes 1.65 yr (602 days), computed from the semi-major axis of 1.395 AU.

An eccentricity of 0.223 makes the orbit moderately elongated.

The orbital plane is tilted 18.92° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 31.7 km/s at perihelion and falls to 20.1 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 = 23.89 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

Astrometry from 66 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5433 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
1.395 AU
Eccentricity
0.2233
Perihelion
1.083 AU
Aphelion
1.706504 AU
Inclination
18.92°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
296.15°

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
2044-Nov-06 06:30 0.339019 AU
50716532 km
15.89 km/s
2049-Oct-30 23:03 0.099007 AU
14811265 km
10.52 km/s
2054-Oct-31 04:57 0.286103 AU
42800364 km
11.59 km/s
2072-Nov-06 18:25 0.232997 AU
34855875 km
16.31 km/s
2077-Oct-31 10:26 0.095071 AU
14222402 km
10.70 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
23.89

Orbit Quality

RMS
0.54332
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

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