SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 UE1

2018 UE1

2018 UE1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.021 AU it takes 1.03 yr to circle the Sun.

Apollo Observations: 60
Orbital Period · P
1.03 yr
v(q)
29.8 km/s
v(Q)
29.1 km/s
Diameter · ≈
0.02 km
TJ
5.98
Eccentricity · e
0.0122

Orbit and dynamics

Between its closest point (1.009 AU) and its farthest (1.033 AU), the heliocentric distance changes by 0.024 AU over every revolution.

One full revolution takes 1.03 yr (377 days), computed from the semi-major axis of 1.021 AU.

With e = 0.012, the orbit is close to circular.

The orbital plane is tilted 5.44° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 29.8 km/s at perihelion and falls to 29.1 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 26.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 60 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5392 arcseconds.

Condition code U = 5 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
1.021 AU
Eccentricity
0.0122
Perihelion
1.009 AU
Aphelion
1.033456 AU
Inclination
5.44°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
202.66°

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
2048-May-03 17:31 0.378034 AU
56553016 km
12.35 km/s
2049-May-02 21:37 0.184484 AU
27598442 km
6.94 km/s
2050-Apr-19 01:30 0.023676 AU
3541821 km
3.05 km/s
2050-Oct-17 13:09 0.036710 AU
5491721 km
2.86 km/s
2051-Oct-10 07:54 0.082604 AU
12357446 km
4.74 km/s
2052-Oct-09 13:48 0.242935 AU
36342605 km
9.04 km/s
2053-Oct-11 05:44 0.406419 AU
60799386 km
13.76 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
26.7

Orbit Quality

RMS
0.53924
Condition
5
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.