SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 EW1

2018 EW1

2018 EW1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.202 AU it takes 1.32 yr to circle the Sun.

Apollo Observations: 74
Orbital Period · P
1.32 yr
v(q)
36.5 km/s
v(Q)
20.2 km/s
Diameter · ≈
0.02 km
TJ
5.25
Eccentricity · e
0.2875

Orbit and dynamics

The path is an ellipse reaching 0.856 AU from the Sun at perihelion and 1.548 AU at aphelion, a radial span of 0.692 AU.

Applying Kepler's third law to a = 1.202 AU gives an orbital period of 1.32 yr, or about 481 days.

An eccentricity of 0.287 makes the orbit moderately elongated.

Its inclination of 3.7° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 36.5 km/s at perihelion and falls to 20.2 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 = 26.3 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 74 observations and has a weighted RMS residual of 0.4732 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
1.202 AU
Eccentricity
0.2875
Perihelion
0.856 AU
Aphelion
1.547575 AU
Inclination
3.7°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
135.71°

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-Sep-27 19:27 0.347263 AU
51949772 km
18.73 km/s
2042-Aug-05 14:55 0.448066 AU
67029783 km
8.03 km/s
2043-Mar-19 14:00 0.163169 AU
24409768 km
13.80 km/s
2046-Sep-03 08:34 0.316880 AU
47404552 km
6.06 km/s
2051-Apr-24 15:56 0.337901 AU
50549262 km
6.19 km/s
2054-Oct-05 12:23 0.213618 AU
31956821 km
14.35 km/s
2055-May-22 22:53 0.464951 AU
69555613 km
8.12 km/s
2067-Jul-25 13:17 0.489346 AU
73205063 km
8.54 km/s
2068-Mar-26 11:17 0.318128 AU
47591311 km
18.20 km/s
2071-Aug-19 02:25 0.387591 AU
57982790 km
7.23 km/s
2072-Mar-09 16:18 0.012318 AU
1842810 km
9.22 km/s
2075-Sep-23 02:01 0.240388 AU
35961483 km
4.37 km/s
2079-Oct-20 07:09 0.033460 AU
5005509 km
7.64 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
26.3

Orbit Quality

RMS
0.47321
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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