SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 UD7

2021 UD7

2021 UD7 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.387 AU it takes 1.63 yr to circle the Sun.

Apollo Observations: 49
Orbital Period · P
1.63 yr
v(q)
34 km/s
v(Q)
18.8 km/s
Diameter · ≈
0.02 km
TJ
4.71
Eccentricity · e
0.2889

Orbit and dynamics

The path is an ellipse reaching 0.987 AU from the Sun at perihelion and 1.788 AU at aphelion, a radial span of 0.801 AU.

Applying Kepler's third law to a = 1.387 AU gives an orbital period of 1.63 yr, or about 597 days.

An eccentricity of 0.289 makes the orbit moderately elongated.

The orbital plane is tilted 14.42° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34 km/s at perihelion and falls to 18.8 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 = 25.89 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 49 observations and has a weighted RMS residual of 0.4504 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
1.387 AU
Eccentricity
0.2889
Perihelion
0.987 AU
Aphelion
1.787704 AU
Inclination
14.42°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
277.02°

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
25.89

Orbit Quality

RMS
0.45041
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.