SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 UE256

2011 UE256

2011 UE256 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.67 AU it takes 4.36 yr to circle the Sun.

Apollo Observations: 202
Orbital Period · P
4.36 yr
v(q)
55 km/s
v(Q)
6 km/s
Diameter · ≈
0.44 km
TJ
2.79
Eccentricity · e
0.802

Orbit and dynamics

Between its closest point (0.529 AU) and its farthest (4.811 AU), the heliocentric distance changes by 4.282 AU over every revolution.

One full revolution takes 4.36 yr (1,594 days), computed from the semi-major axis of 2.67 AU.

The high eccentricity (0.802) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 11.68° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 55 km/s at perihelion and falls to 6 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 = 19.55 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.44 km.

Observation record and orbit quality

Astrometry from 202 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5106 arcseconds.

Condition code U = 0 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
2.67 AU
Eccentricity
0.802
Perihelion
0.529 AU
Aphelion
4.81134 AU
Inclination
11.68°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
108.36°

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
19.55

Orbit Quality

RMS
0.5106
Condition
0
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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