SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 EX

2018 EX

2018 EX is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.284 AU once every 1.45 yr.

Amor Observations: 54
Orbital Period · P
1.45 yr
v(q)
32.3 km/s
v(Q)
21.4 km/s
Diameter · ≈
0.01 km
TJ
5.02
Eccentricity · e
0.2033

Orbit and dynamics

The path is an ellipse reaching 1.023 AU from the Sun at perihelion and 1.545 AU at aphelion, a radial span of 0.522 AU.

Applying Kepler's third law to a = 1.284 AU gives an orbital period of 1.45 yr, or about 531 days.

An eccentricity of 0.203 makes the orbit moderately elongated.

Its inclination of 3.13° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 32.3 km/s at perihelion and falls to 21.4 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 27 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

The current orbit solution is based on 54 observations and has a weighted RMS residual of 0.4448 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
1.284 AU
Eccentricity
0.2033
Perihelion
1.023 AU
Aphelion
1.545037 AU
Inclination
3.13°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
242.86°

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
2030-Nov-07 14:45 0.411553 AU
61567411 km
6.40 km/s
2034-Mar-23 11:16 0.027993 AU
4187669 km
3.55 km/s
2037-Jan-24 23:24 0.439354 AU
65726379 km
15.83 km/s
2037-Jun-28 03:28 0.362130 AU
54173880 km
5.05 km/s
2046-Oct-17 14:00 0.484059 AU
72414146 km
7.60 km/s
2049-Dec-02 23:16 0.310526 AU
46454044 km
4.54 km/s
2050-Apr-24 21:27 0.322115 AU
48187678 km
13.19 km/s
2053-Feb-14 07:39 0.070897 AU
10606000 km
6.02 km/s
2056-Jul-18 00:45 0.421161 AU
63004788 km
6.45 km/s
2065-Nov-07 09:17 0.404679 AU
60539101 km
6.46 km/s
2072-Jan-28 20:48 0.362047 AU
54161481 km
14.22 km/s
2072-Jun-21 18:48 0.328837 AU
49193286 km
4.57 km/s
2075-Aug-06 20:16 0.491763 AU
73566660 km
7.49 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
27.0

Orbit Quality

RMS
0.4448
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.

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