SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 UZ255

2011 UZ255

2011 UZ255 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.037 AU it takes 2.91 yr to circle the Sun.

Apollo Observations: 134
Orbital Period · P
2.91 yr
v(q)
40.4 km/s
v(Q)
10.8 km/s
Diameter · ≈
0.08 km
TJ
3.57
Eccentricity · e
0.5782

Orbit and dynamics

The path is an ellipse reaching 0.859 AU from the Sun at perihelion and 3.215 AU at aphelion, a radial span of 2.356 AU.

Applying Kepler's third law to a = 2.037 AU gives an orbital period of 2.91 yr, or about 1,062 days.

The high eccentricity (0.578) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 3.47° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 40.4 km/s at perihelion and falls to 10.8 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 = 23.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

The current orbit solution is based on 134 observations and has a weighted RMS residual of 0.5788 arcseconds.

Condition code U = 1 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.

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
2.037 AU
Eccentricity
0.5782
Perihelion
0.859 AU
Aphelion
3.214793 AU
Inclination
3.47°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
23.9°

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
2040-Nov-22 13:14 0.473874 AU
70890611 km
27.32 km/s
2043-Oct-06 06:52 0.101226 AU
15143162 km
10.76 km/s
2046-Jun-24 21:50 0.141170 AU
21118679 km
16.92 km/s
2072-Oct-29 19:48 0.052110 AU
7795587 km
14.86 km/s
2075-Jul-13 07:56 0.082365 AU
12321602 km
11.75 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
23.3

Orbit Quality

RMS
0.57879
Condition
1
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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