SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 SE3

2018 SE3

2018 SE3 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.178 AU once every 1.28 yr.

Amor Observations: 43
Orbital Period · P
1.28 yr
v(q)
28 km/s
v(Q)
26.9 km/s
Diameter · ≈
0.07 km
TJ
5.18
Eccentricity · e
0.0188

Orbit and dynamics

Between its closest point (1.155 AU) and its farthest (1.2 AU), the heliocentric distance changes by 0.045 AU over every revolution.

One full revolution takes 1.28 yr (467 days), computed from the semi-major axis of 1.178 AU.

With e = 0.019, the orbit is close to circular.

A steep inclination of 36.73° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 28 km/s at perihelion and falls to 26.9 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 = 23.45 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.07 km.

Observation record and orbit quality

Astrometry from 43 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4538 arcseconds.

Condition code U = 3 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
1.178 AU
Eccentricity
0.0188
Perihelion
1.155 AU
Aphelion
1.200146 AU
Inclination
36.73°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
101.56°

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
2027-Sep-30 10:39 0.278997 AU
41737342 km
18.54 km/s
2032-Mar-28 06:10 0.281090 AU
42050421 km
19.22 km/s
2032-Sep-28 05:26 0.416345 AU
62284285 km
20.57 km/s
2037-Mar-26 19:36 0.411226 AU
61518530 km
19.70 km/s
2041-Sep-28 20:58 0.197401 AU
29530706 km
18.36 km/s
2046-Mar-28 08:51 0.191695 AU
28677223 km
18.23 km/s
2050-Sep-30 05:23 0.274888 AU
41122712 km
18.50 km/s
2055-Mar-29 02:40 0.276472 AU
41359558 km
19.18 km/s
2055-Sep-29 01:17 0.421134 AU
63000780 km
20.64 km/s
2060-Mar-26 14:36 0.416425 AU
62296266 km
19.74 km/s
2064-Sep-28 17:05 0.200047 AU
29926548 km
18.37 km/s
2069-Mar-28 03:46 0.194724 AU
29130286 km
18.24 km/s
2073-Sep-30 01:02 0.268700 AU
40196954 km
18.47 km/s
2078-Mar-28 22:21 0.269541 AU
40322693 km
19.11 km/s
2078-Sep-28 21:29 0.428730 AU
64137048 km
20.73 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
23.45

Orbit Quality

RMS
0.45383
Condition
3
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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