SpaceAtlas Space Object Data
NASA JPL SBDB · 2019 LU4

2019 LU4

2019 LU4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.429 AU it takes 1.71 yr to circle the Sun.

Apollo Observations: 54
Orbital Period · P
1.71 yr
v(q)
36 km/s
v(Q)
17.2 km/s
Diameter · ≈
0.02 km
TJ
4.62
Eccentricity · e
0.3523

Orbit and dynamics

The path is an ellipse reaching 0.926 AU from the Sun at perihelion and 1.932 AU at aphelion, a radial span of 1.006 AU.

Applying Kepler's third law to a = 1.429 AU gives an orbital period of 1.71 yr, or about 624 days.

An eccentricity of 0.352 makes the orbit moderately elongated.

Its inclination of 2.96° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 36 km/s at perihelion and falls to 17.2 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 = 26.55 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

The current orbit solution is based on 54 observations and has a weighted RMS residual of 0.5865 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
1.429 AU
Eccentricity
0.3523
Perihelion
0.926 AU
Aphelion
1.932437 AU
Inclination
2.96°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
6.92°

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
2031-May-28 02:12 0.194593 AU
29110694 km
15.39 km/s
2036-Oct-08 11:21 0.108597 AU
16245944 km
13.02 km/s
2060-Oct-29 13:20 0.325034 AU
48624357 km
4.30 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
26.55

Orbit Quality

RMS
0.58649
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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