SpaceAtlas Space Object Data
NASA JPL SBDB · 2025 UD3

2025 UD3

2025 UD3 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.887 AU and a period of 0.84 yr.

Aten Observations: 39
Orbital Period · P
0.84 yr
v(q)
40.3 km/s
v(Q)
24.8 km/s
Diameter · ≈
0.01 km
TJ
6.66
Eccentricity · e
0.2375

Orbit and dynamics

Between its closest point (0.677 AU) and its farthest (1.098 AU), the heliocentric distance changes by 0.421 AU over every revolution.

One full revolution takes 0.84 yr (305 days), computed from the semi-major axis of 0.887 AU.

An eccentricity of 0.237 makes the orbit moderately elongated.

Its inclination of 4.77° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 40.3 km/s at perihelion and falls to 24.8 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 = 28.54 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 39 individual observations underpins this orbit; the fit leaves an RMS residual of 0.2397 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
0.8875 AU
Eccentricity
0.2375
Perihelion
0.677 AU
Aphelion
1.098281 AU
Inclination
4.77°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
157.72°

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
2030-Oct-05 20:50 0.081642 AU
12213402 km
4.95 km/s
2035-Sep-03 01:14 0.111913 AU
16741990 km
4.98 km/s
2040-Jul-27 15:38 0.086473 AU
12936223 km
5.04 km/s
2045-Jul-21 18:06 0.086125 AU
12884168 km
7.87 km/s
2050-Jul-24 20:35 0.135598 AU
20285240 km
11.44 km/s
2066-Oct-25 20:53 0.102786 AU
15376562 km
9.95 km/s
2071-Oct-27 01:37 0.006558 AU
981037 km
7.07 km/s
2076-Oct-26 01:58 0.012411 AU
1856679 km
6.93 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
28.54

Orbit Quality

RMS
0.23971
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.

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