SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 HL

2018 HL

2018 HL belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.046 AU it takes 1.07 yr to circle the Sun.

Apollo Observations: 76
Orbital Period · P
1.07 yr
v(q)
36.8 km/s
v(Q)
23 km/s
Diameter · ≈
0.08 km
TJ
5.84
Eccentricity · e
0.2306

Orbit and dynamics

The path is an ellipse reaching 0.805 AU from the Sun at perihelion and 1.287 AU at aphelion, a radial span of 0.482 AU.

Applying Kepler's third law to a = 1.046 AU gives an orbital period of 1.07 yr, or about 391 days.

An eccentricity of 0.231 makes the orbit moderately elongated.

The orbital plane is tilted 7.87° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 36.8 km/s at perihelion and falls to 23 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 = 23.2 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

The current orbit solution is based on 76 observations and has a weighted RMS residual of 0.3545 arcseconds.

Condition code U = 7 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
1.046 AU
Eccentricity
0.2306
Perihelion
0.805 AU
Aphelion
1.287208 AU
Inclination
7.87°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
309.86°

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
23.2

Orbit Quality

RMS
0.35448
Condition
7
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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