SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 HG2

2020 HG2

2020 HG2 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.806 AU it takes 2.43 yr to circle the Sun.

Apollo Observations: 49
Orbital Period · P
2.43 yr
v(q)
42.7 km/s
v(Q)
11.5 km/s
Diameter · ≈
0.13 km
TJ
3.58
Eccentricity · e
0.576

Orbit and dynamics

Between its closest point (0.766 AU) and its farthest (2.846 AU), the heliocentric distance changes by 2.08 AU over every revolution.

One full revolution takes 2.43 yr (886 days), computed from the semi-major axis of 1.806 AU.

The high eccentricity (0.576) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 43.22° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 42.7 km/s at perihelion and falls to 11.5 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 = 22.13 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.13 km.

Observation record and orbit quality

Astrometry from 49 individual observations underpins this orbit; the fit leaves an RMS residual of 0.396 arcseconds.

Condition code U = 1 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.

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
1.806 AU
Eccentricity
0.576
Perihelion
0.766 AU
Aphelion
2.846256 AU
Inclination
43.22°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
216.9°

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
2037-Apr-19 08:02 0.252002 AU
37699033 km
24.38 km/s
2041-Oct-31 03:48 0.171572 AU
25666873 km
29.53 km/s
2054-Apr-18 07:50 0.280269 AU
41927686 km
23.51 km/s
2058-Oct-28 09:45 0.237895 AU
35588514 km
31.02 km/s
2071-Apr-17 06:57 0.330848 AU
49494203 km
22.53 km/s
2075-Oct-25 06:37 0.314545 AU
47055303 km
32.77 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
22.13

Orbit Quality

RMS
0.39604
Condition
1
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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