SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 ES1

2018 ES1

2018 ES1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.136 AU it takes 1.21 yr to circle the Sun.

Apollo Observations: 42
Orbital Period · P
1.21 yr
v(q)
32.6 km/s
v(Q)
24 km/s
Diameter · ≈
0.02 km
TJ
5.42
Eccentricity · e
0.1529

Orbit and dynamics

The path is an ellipse reaching 0.962 AU from the Sun at perihelion and 1.31 AU at aphelion, a radial span of 0.348 AU.

Applying Kepler's third law to a = 1.136 AU gives an orbital period of 1.21 yr, or about 442 days.

An eccentricity of 0.153 makes the orbit moderately elongated.

A steep inclination of 25.25° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 32.6 km/s at perihelion and falls to 24 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 = 26.8 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 42 observations and has a weighted RMS residual of 0.5945 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
1.136 AU
Eccentricity
0.1529
Perihelion
0.962 AU
Aphelion
1.309694 AU
Inclination
25.25°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
328.0°

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-23 00:52 0.369707 AU
55307356 km
12.69 km/s
2034-Oct-01 21:00 0.346809 AU
51881880 km
16.43 km/s
2035-Feb-22 16:52 0.227752 AU
34071264 km
15.40 km/s
2040-Sep-22 17:04 0.237076 AU
35466014 km
13.40 km/s
2041-Mar-07 00:09 0.003973 AU
594419 km
13.65 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
26.8

Orbit Quality

RMS
0.59449
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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