SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 HM2

2020 HM2

2020 HM2 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.508 AU once every 1.85 yr.

Amor Observations: 39
Orbital Period · P
1.85 yr
v(q)
33.3 km/s
v(Q)
17.7 km/s
Diameter · ≈
0.03 km
TJ
4.47
Eccentricity · e
0.307

Orbit and dynamics

Between its closest point (1.045 AU) and its farthest (1.971 AU), the heliocentric distance changes by 0.926 AU over every revolution.

One full revolution takes 1.85 yr (676 days), computed from the semi-major axis of 1.508 AU.

An eccentricity of 0.307 makes the orbit moderately elongated.

Its inclination of 4.59° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 33.3 km/s at perihelion and falls to 17.7 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 = 25.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 39 individual observations underpins this orbit; the fit leaves an RMS residual of 0.7978 arcseconds.

Condition code U = 6 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
1.508 AU
Eccentricity
0.307
Perihelion
1.045 AU
Aphelion
1.970956 AU
Inclination
4.59°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
123.5°

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
2033-Mar-02 11:52 0.247385 AU
37008339 km
11.03 km/s
2044-Jan-22 09:26 0.361295 AU
54048993 km
3.60 km/s
2044-May-18 01:20 0.286203 AU
42815359 km
13.72 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
25.7

Orbit Quality

RMS
0.79783
Condition
6
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.