SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 WR

2018 WR

2018 WR belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.166 AU it takes 1.26 yr to circle the Sun.

Apollo Observations: 27
Orbital Period · P
1.26 yr
v(q)
34.6 km/s
v(Q)
22 km/s
Diameter · ≈
0.02 km
TJ
5.38
Eccentricity · e
0.224

Orbit and dynamics

Between its closest point (0.905 AU) and its farthest (1.427 AU), the heliocentric distance changes by 0.522 AU over every revolution.

One full revolution takes 1.26 yr (460 days), computed from the semi-major axis of 1.166 AU.

An eccentricity of 0.224 makes the orbit moderately elongated.

The orbital plane is tilted 6.07° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.6 km/s at perihelion and falls to 22 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 = 26.2 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 27 individual observations underpins this orbit; the fit leaves an RMS residual of 0.485 arcseconds.

Condition code U = 6 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
1.166 AU
Eccentricity
0.224
Perihelion
0.905 AU
Aphelion
1.427184 AU
Inclination
6.07°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
42.46°

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
2028-Mar-25 15:25 0.432956 AU
64769354 km
8.04 km/s
2028-Dec-08 23:30 0.432568 AU
64711282 km
20.21 km/s
2033-Mar-05 11:54 0.447133 AU
66890158 km
8.08 km/s
2037-Jun-17 01:36 0.245045 AU
36658158 km
14.67 km/s
2038-Feb-12 11:53 0.412172 AU
61660022 km
7.55 km/s
2042-Jun-28 14:53 0.083815 AU
12538517 km
7.86 km/s
2043-Jan-18 19:41 0.328923 AU
49206106 km
6.27 km/s
2052-Nov-13 02:23 0.001524 AU
227923 km
6.99 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
26.2

Orbit Quality

RMS
0.48502
Condition
6
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.