SpaceAtlas Space Object Data
NASA JPL SBDB · 2022 UM21

2022 UM21

2022 UM21 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.968 AU and a period of 0.95 yr.

Aten Observations: 17
Orbital Period · P
0.95 yr
v(q)
49.6 km/s
v(Q)
18.5 km/s
Diameter · ≈
0.02 km
TJ
6.13
Eccentricity · e
0.4568

Orbit and dynamics

The path is an ellipse reaching 0.526 AU from the Sun at perihelion and 1.411 AU at aphelion, a radial span of 0.885 AU.

Applying Kepler's third law to a = 0.968 AU gives an orbital period of 0.95 yr, or about 348 days.

The high eccentricity (0.457) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 11.4° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 49.6 km/s at perihelion and falls to 18.5 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 = 26.55 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 17 observations and has a weighted RMS residual of 0.2992 arcseconds.

Condition code U = 8 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
0.9683 AU
Eccentricity
0.4568
Perihelion
0.526 AU
Aphelion
1.410619 AU
Inclination
11.4°
Orbital Period
— yr
Epoch
2459883.5
Mean Anomaly
285.57°

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
26.55

Orbit Quality

RMS
0.29923
Condition
8
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.

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