SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 GW3

2018 GW3

2018 GW3 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.155 AU it takes 1.24 yr to circle the Sun.

Apollo Observations: 56
Orbital Period · P
1.24 yr
v(q)
32 km/s
v(Q)
24 km/s
Diameter · ≈
0.04 km
TJ
5.41
Eccentricity · e
0.1426

Orbit and dynamics

The path is an ellipse reaching 0.99 AU from the Sun at perihelion and 1.32 AU at aphelion, a radial span of 0.33 AU.

Applying Kepler's third law to a = 1.155 AU gives an orbital period of 1.24 yr, or about 453 days.

An eccentricity of 0.143 makes the orbit moderately elongated.

The orbital plane is tilted 12.93° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32 km/s at perihelion and falls to 24 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 = 24.63 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

The current orbit solution is based on 56 observations and has a weighted RMS residual of 0.4868 arcseconds.

Condition code U = 0 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.

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
1.155 AU
Eccentricity
0.1426
Perihelion
0.99 AU
Aphelion
1.319703 AU
Inclination
12.93°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
149.57°

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-Apr-10 15:39 0.360079 AU
53867118 km
15.48 km/s
2028-Nov-06 03:15 0.326444 AU
48835356 km
7.54 km/s
2033-Dec-02 14:00 0.393255 AU
58830118 km
7.18 km/s
2039-Jan-01 16:35 0.417156 AU
62405615 km
6.32 km/s
2044-Feb-07 19:13 0.382216 AU
57178699 km
5.77 km/s
2044-Sep-12 16:17 0.390316 AU
58390445 km
14.94 km/s
2049-Mar-26 13:30 0.265617 AU
39735675 km
6.58 km/s
2049-Sep-12 01:51 0.220120 AU
32929477 km
10.03 km/s
2054-Apr-18 09:50 0.098833 AU
14785187 km
6.95 km/s
2054-Sep-21 18:28 0.153907 AU
23024088 km
7.46 km/s
2059-Apr-18 08:18 0.124909 AU
18686116 km
9.60 km/s
2059-Oct-10 01:46 0.216213 AU
32344965 km
7.28 km/s
2064-Apr-12 07:09 0.318327 AU
47621007 km
14.39 km/s
2064-Nov-01 10:01 0.309778 AU
46342090 km
7.53 km/s
2069-Nov-26 13:05 0.381818 AU
57119096 km
7.31 km/s
2074-Dec-24 10:48 0.416287 AU
62275680 km
6.58 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
24.63

Orbit Quality

RMS
0.48678
Condition
0
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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