SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 HH4

2020 HH4

2020 HH4 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.023 AU once every 2.88 yr.

Amor Observations: 28
Orbital Period · P
2.88 yr
v(q)
35.2 km/s
v(Q)
12.5 km/s
Diameter · ≈
0.13 km
TJ
3.53
Eccentricity · e
0.4774

Orbit and dynamics

Between its closest point (1.057 AU) and its farthest (2.989 AU), the heliocentric distance changes by 1.932 AU over every revolution.

One full revolution takes 2.88 yr (1,051 days), computed from the semi-major axis of 2.023 AU.

The high eccentricity (0.477) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 29.34° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 35.2 km/s at perihelion and falls to 12.5 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 = 22.2 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.13 km.

Observation record and orbit quality

Astrometry from 28 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4638 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
2.023 AU
Eccentricity
0.4774
Perihelion
1.057 AU
Aphelion
2.98878 AU
Inclination
29.34°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
30.52°

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
22.2

Orbit Quality

RMS
0.46378
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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