SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 HF4

2020 HF4

2020 HF4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.018 AU it takes 1.03 yr to circle the Sun.

Apollo Observations: 28
Orbital Period · P
1.03 yr
v(q)
30.3 km/s
v(Q)
28.8 km/s
Diameter · ≈
0.01 km
TJ
5.99
Eccentricity · e
0.0243

Orbit and dynamics

Between its closest point (0.993 AU) and its farthest (1.043 AU), the heliocentric distance changes by 0.05 AU over every revolution.

One full revolution takes 1.03 yr (375 days), computed from the semi-major axis of 1.018 AU.

With e = 0.024, the orbit is close to circular.

Its inclination of 4.83° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 30.3 km/s at perihelion and falls to 28.8 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 = 27.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 28 individual observations underpins this orbit; the fit leaves an RMS residual of 0.6358 arcseconds.

Condition code U = 5 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
1.018 AU
Eccentricity
0.0243
Perihelion
0.993 AU
Aphelion
1.042737 AU
Inclination
4.83°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
132.8°

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
2056-Sep-23 12:59 0.384142 AU
57466806 km
11.71 km/s
2057-Oct-14 22:15 0.221065 AU
33070923 km
7.09 km/s
2058-Jun-25 08:42 0.112645 AU
16851513 km
3.15 km/s
2058-Oct-27 10:14 0.064024 AU
9577844 km
3.20 km/s
2059-Apr-28 02:22 0.026313 AU
3936429 km
2.56 km/s
2059-Nov-02 02:56 0.052768 AU
7894051 km
3.12 km/s
2060-Oct-31 09:15 0.221921 AU
33198838 km
7.23 km/s
2061-Oct-23 07:32 0.396106 AU
59256548 km
12.01 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
27.4

Orbit Quality

RMS
0.6358
Condition
5
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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