SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 NG2

2018 NG2

2018 NG2 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.507 AU once every 1.85 yr.

Amor Observations: 45
Orbital Period · P
1.85 yr
v(q)
28.1 km/s
v(Q)
20.9 km/s
Diameter · ≈
0.17 km
TJ
4.46
Eccentricity · e
0.1462

Orbit and dynamics

The path is an ellipse reaching 1.287 AU from the Sun at perihelion and 1.727 AU at aphelion, a radial span of 0.44 AU.

Applying Kepler's third law to a = 1.507 AU gives an orbital period of 1.85 yr, or about 676 days.

An eccentricity of 0.146 makes the orbit moderately elongated.

The orbital plane is tilted 18.67° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 28.1 km/s at perihelion and falls to 20.9 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 = 21.66 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.17 km.

Observation record and orbit quality

The current orbit solution is based on 45 observations and has a weighted RMS residual of 0.2597 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
1.507 AU
Eccentricity
0.1462
Perihelion
1.287 AU
Aphelion
1.727323 AU
Inclination
18.67°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
77.19°

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
2031-Aug-14 17:58 0.371682 AU
55602876 km
9.46 km/s
2042-Jul-11 22:48 0.379185 AU
56725274 km
9.34 km/s
2055-Jul-26 14:34 0.286212 AU
42816637 km
9.39 km/s
2068-Aug-07 23:20 0.324573 AU
48555360 km
9.49 km/s
2079-Jul-05 02:50 0.433684 AU
64878135 km
9.17 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
21.66

Orbit Quality

RMS
0.25969
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.

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