SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 LE1

2018 LE1

2018 LE1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.023 AU it takes 1.03 yr to circle the Sun.

Apollo Observations: 55
Orbital Period · P
1.03 yr
v(q)
36.3 km/s
v(Q)
23.9 km/s
Diameter · ≈
0.01 km
TJ
5.95
Eccentricity · e
0.2059

Orbit and dynamics

The path is an ellipse reaching 0.812 AU from the Sun at perihelion and 1.234 AU at aphelion, a radial span of 0.422 AU.

Applying Kepler's third law to a = 1.023 AU gives an orbital period of 1.03 yr, or about 378 days.

An eccentricity of 0.206 makes the orbit moderately elongated.

Its inclination of 1.8° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 36.3 km/s at perihelion and falls to 23.9 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 = 27.5 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 55 observations and has a weighted RMS residual of 0.4235 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
1.023 AU
Eccentricity
0.2059
Perihelion
0.812 AU
Aphelion
1.233636 AU
Inclination
1.8°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
352.68°

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
2042-Oct-26 09:23 0.474553 AU
70992141 km
20.61 km/s
2043-Nov-05 08:10 0.267282 AU
39984746 km
14.37 km/s
2044-Nov-14 04:52 0.056404 AU
8437956 km
8.06 km/s
2045-Oct-29 12:31 0.117806 AU
17623543 km
3.55 km/s
2045-Dec-23 13:19 0.115389 AU
17261907 km
4.10 km/s
2046-Sep-11 15:02 0.211131 AU
31584713 km
5.35 km/s
2047-Feb-19 04:46 0.178336 AU
26678719 km
6.17 km/s
2047-Aug-08 04:14 0.215171 AU
32189078 km
5.37 km/s
2048-Apr-14 15:39 0.132694 AU
19850721 km
4.36 km/s
2048-Jun-23 06:21 0.137219 AU
20527645 km
3.79 km/s
2049-May-30 22:00 0.043116 AU
6449994 km
7.35 km/s
2050-Jun-09 23:13 0.259227 AU
38779870 km
13.56 km/s
2051-Jun-19 23:46 0.469346 AU
70213237 km
19.78 km/s
2073-Nov-03 21:34 0.229382 AU
34314997 km
15.35 km/s
2074-Nov-14 02:48 0.008268 AU
1236913 km
8.82 km/s
2079-Jun-01 05:41 0.006156 AU
920922 km
7.86 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
27.5

Orbit Quality

RMS
0.42354
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.

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