SpaceAtlas Space Object Data
NASA JPL SBDB · 2019 WS4

2019 WS4

2019 WS4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.195 AU it takes 1.31 yr to circle the Sun.

Apollo Observations: 32
Orbital Period · P
1.31 yr
v(q)
34 km/s
v(Q)
21.8 km/s
Diameter · ≈
0.04 km
TJ
5.28
Eccentricity · e
0.2179

Orbit and dynamics

Between its closest point (0.935 AU) and its farthest (1.455 AU), the heliocentric distance changes by 0.52 AU over every revolution.

One full revolution takes 1.31 yr (477 days), computed from the semi-major axis of 1.195 AU.

An eccentricity of 0.218 makes the orbit moderately elongated.

The orbital plane is tilted 8.68° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34 km/s at perihelion and falls to 21.8 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 = 24.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

Astrometry from 32 individual observations underpins this orbit; the fit leaves an RMS residual of 0.6296 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
1.195 AU
Eccentricity
0.2179
Perihelion
0.935 AU
Aphelion
1.455391 AU
Inclination
8.68°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
302.12°

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-Aug-20 05:16 0.473549 AU
70841933 km
7.72 km/s
2032-Oct-07 23:34 0.383705 AU
57401498 km
6.26 km/s
2033-May-02 20:38 0.283176 AU
42362498 km
13.87 km/s
2036-Dec-21 14:47 0.033634 AU
5031537 km
6.35 km/s
2037-May-19 12:23 0.199120 AU
29787884 km
5.32 km/s
2040-Nov-27 05:36 0.384560 AU
57529358 km
19.60 km/s
2041-Jul-12 20:01 0.398955 AU
59682785 km
7.49 km/s
2050-May-02 09:20 0.138745 AU
20756024 km
13.32 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
24.5

Orbit Quality

RMS
0.62957
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.

Keep exploring

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