SpaceAtlas Space Object Data
NASA JPL SBDB · 2019 WM4

2019 WM4

2019 WM4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.027 AU it takes 1.04 yr to circle the Sun.

Apollo Observations: 15
Orbital Period · P
1.04 yr
v(q)
42.1 km/s
v(Q)
20.5 km/s
Diameter · ≈
0.09 km
TJ
5.89
Eccentricity · e
0.3445

Orbit and dynamics

The path is an ellipse reaching 0.673 AU from the Sun at perihelion and 1.381 AU at aphelion, a radial span of 0.708 AU.

Applying Kepler's third law to a = 1.027 AU gives an orbital period of 1.04 yr, or about 380 days.

An eccentricity of 0.344 makes the orbit moderately elongated.

The orbital plane is tilted 10.49° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 42.1 km/s at perihelion and falls to 20.5 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 = 23.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.09 km.

Observation record and orbit quality

The current orbit solution is based on 15 observations and has a weighted RMS residual of 0.4315 arcseconds.

Condition code U = 8 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
1.027 AU
Eccentricity
0.3445
Perihelion
0.673 AU
Aphelion
1.380802 AU
Inclination
10.49°
Orbital Period
— yr
Epoch
2458814.5
Mean Anomaly
95.38°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
23.1

Orbit Quality

RMS
0.43145
Condition
8
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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