SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 GS4

2018 GS4

2018 GS4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.232 AU it takes 1.37 yr to circle the Sun.

Apollo Observations: 91
Orbital Period · P
1.37 yr
v(q)
33.1 km/s
v(Q)
21.7 km/s
Diameter · ≈
0.04 km
TJ
5.17
Eccentricity · e
0.2076

Orbit and dynamics

Between its closest point (0.976 AU) and its farthest (1.488 AU), the heliocentric distance changes by 0.512 AU over every revolution.

One full revolution takes 1.37 yr (499 days), computed from the semi-major axis of 1.232 AU.

An eccentricity of 0.208 makes the orbit moderately elongated.

The orbital plane is tilted 6.57° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.1 km/s at perihelion and falls to 21.7 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 = 24.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

Astrometry from 91 individual observations underpins this orbit; the fit leaves an RMS residual of 0.512 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
1.232 AU
Eccentricity
0.2076
Perihelion
0.976 AU
Aphelion
1.487763 AU
Inclination
6.57°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
24.28°

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
2028-Dec-24 04:44 0.276899 AU
41423468 km
12.71 km/s
2029-Jun-10 08:57 0.322359 AU
48224191 km
4.93 km/s
2032-Nov-07 12:46 0.274727 AU
41098587 km
5.59 km/s
2033-Apr-19 12:49 0.181209 AU
27108522 km
11.26 km/s
2036-Sep-11 00:21 0.466872 AU
69843096 km
7.87 km/s
2040-Jul-22 17:05 0.449854 AU
67297252 km
7.03 km/s
2047-Oct-15 00:37 0.362090 AU
54167833 km
6.95 km/s
2048-May-01 08:44 0.384398 AU
57505103 km
17.82 km/s
2051-Aug-26 14:15 0.487390 AU
72912504 km
7.86 km/s
2055-Jul-05 03:56 0.390448 AU
58410165 km
6.18 km/s
2059-Apr-06 10:14 0.041495 AU
6207552 km
5.51 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
24.9

Orbit Quality

RMS
0.51195
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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