SpaceAtlas Space Object Data
NASA JPL SBDB · 2012 UU158

2012 UU158

2012 UU158 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.1 AU it takes 1.15 yr to circle the Sun.

Apollo Observations: 14
Orbital Period · P
1.15 yr
v(q)
42.1 km/s
v(Q)
19.2 km/s
Diameter · ≈
0.01 km
TJ
5.58
Eccentricity · e
0.3739

Orbit and dynamics

Between its closest point (0.688 AU) and its farthest (1.511 AU), the heliocentric distance changes by 0.823 AU over every revolution.

One full revolution takes 1.15 yr (421 days), computed from the semi-major axis of 1.1 AU.

An eccentricity of 0.374 makes the orbit moderately elongated.

The orbital plane is tilted 5.97° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 42.1 km/s at perihelion and falls to 19.2 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 = 26.91 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 14 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5209 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
1.1 AU
Eccentricity
0.3739
Perihelion
0.688 AU
Aphelion
1.51129 AU
Inclination
5.97°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
350.69°

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
2033-Mar-19 11:40 0.124842 AU
18676032 km
20.49 km/s
2034-Dec-06 11:27 0.415794 AU
62201833 km
9.93 km/s
2035-Nov-04 05:25 0.252807 AU
37819411 km
22.30 km/s
2041-Apr-06 00:31 0.053288 AU
7971836 km
9.77 km/s
2048-Mar-10 21:04 0.280964 AU
42031556 km
26.23 km/s
2056-Mar-29 21:49 0.027599 AU
4128821 km
13.66 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
26.91

Orbit Quality

RMS
0.52087
Condition
7
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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