SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 EU1

2018 EU1

2018 EU1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.244 AU it takes 1.39 yr to circle the Sun.

Apollo Observations: 22
Orbital Period · P
1.39 yr
v(q)
37.8 km/s
v(Q)
18.8 km/s
Diameter · ≈
0.02 km
TJ
5.08
Eccentricity · e
0.3355

Orbit and dynamics

The path is an ellipse reaching 0.827 AU from the Sun at perihelion and 1.661 AU at aphelion, a radial span of 0.834 AU.

Applying Kepler's third law to a = 1.244 AU gives an orbital period of 1.39 yr, or about 507 days.

An eccentricity of 0.336 makes the orbit moderately elongated.

The orbital plane is tilted 13.55° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 37.8 km/s at perihelion and falls to 18.8 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 = 26.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

The current orbit solution is based on 22 observations and has a weighted RMS residual of 0.4004 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
1.244 AU
Eccentricity
0.3355
Perihelion
0.827 AU
Aphelion
1.661362 AU
Inclination
13.55°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
296.42°

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
2029-Aug-21 10:16 0.083518 AU
12494126 km
10.44 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
0.40036
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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