Orbit and dynamics
Between its closest point (0.768 AU) and its farthest (2.012 AU), the heliocentric distance changes by 1.244 AU over every revolution.
One full revolution takes 1.64 yr (599 days), computed from the semi-major axis of 1.39 AU.
The high eccentricity (0.448) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.
Its inclination of 2.64° keeps it close to the plane of the ecliptic.
By the vis-viva equation its orbital speed rises to 40.9 km/s at perihelion and falls to 15.6 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
Neither a measured diameter nor a reliable absolute magnitude is available for 2018 UA, so its physical size remains unconstrained.
Observation record and orbit quality
Astrometry from 29 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3701 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
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 distance | Velocity |
|---|---|---|
| 2027-Apr-10 16:52 | 0.266777 AU 39909257 km |
24.97 km/s |
| 2063-Apr-10 17:41 | 0.396377 AU 59297201 km |
24.77 km/s |
Distances in astronomical units (AU) and kilometres. Source: NASA/JPL CNEOS Close Approach Data API.
Physical Parameters
Orbit Quality
Related Objects
Same object type
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