SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 HJ

2020 HJ

2020 HJ is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.159 AU once every 1.25 yr.

Amor Observations: 46
Orbital Period · P
1.25 yr
v(q)
31.2 km/s
v(Q)
24.5 km/s
Diameter · ≈
0.03 km
TJ
5.4
Eccentricity · e
0.1205

Orbit and dynamics

The path is an ellipse reaching 1.019 AU from the Sun at perihelion and 1.299 AU at aphelion, a radial span of 0.28 AU.

Applying Kepler's third law to a = 1.159 AU gives an orbital period of 1.25 yr, or about 456 days.

An eccentricity of 0.12 makes the orbit moderately elongated.

The orbital plane is tilted 13.79° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 31.2 km/s at perihelion and falls to 24.5 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 25.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

The current orbit solution is based on 46 observations and has a weighted RMS residual of 0.5222 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
1.159 AU
Eccentricity
0.1205
Perihelion
1.019 AU
Aphelion
1.29866 AU
Inclination
13.79°
Orbital Period
— yr
Epoch
2458958.5
Mean Anomaly
319.88°

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
2030-Apr-20 00:38 0.017770 AU
2658310 km
10.61 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
25.3

Orbit Quality

RMS
0.52217
Condition
8
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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