SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 GT3

2018 GT3

2018 GT3 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.329 AU once every 1.53 yr.

Amor Observations: 51
Orbital Period · P
1.53 yr
v(q)
28.9 km/s
v(Q)
23.1 km/s
Diameter · ≈
0.13 km
TJ
4.7
Eccentricity · e
0.1133

Orbit and dynamics

Between its closest point (1.179 AU) and its farthest (1.48 AU), the heliocentric distance changes by 0.301 AU over every revolution.

One full revolution takes 1.53 yr (560 days), computed from the semi-major axis of 1.329 AU.

An eccentricity of 0.113 makes the orbit moderately elongated.

A steep inclination of 38.69° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 28.9 km/s at perihelion and falls to 23.1 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 = 22.16 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.13 km.

Observation record and orbit quality

Astrometry from 51 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3828 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
1.329 AU
Eccentricity
0.1133
Perihelion
1.179 AU
Aphelion
1.479576 AU
Inclination
38.69°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
164.9°

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
2044-Apr-13 16:29 0.245590 AU
36739766 km
20.42 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
22.16

Orbit Quality

RMS
0.38282
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.

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