SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 SM1

2020 SM1

2020 SM1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.125 AU it takes 1.19 yr to circle the Sun.

Apollo Observations: 149
Orbital Period · P
1.19 yr
v(q)
35.8 km/s
v(Q)
22 km/s
Diameter · ≈
0.02 km
TJ
5.53
Eccentricity · e
0.2386

Orbit and dynamics

The path is an ellipse reaching 0.857 AU from the Sun at perihelion and 1.393 AU at aphelion, a radial span of 0.536 AU.

Applying Kepler's third law to a = 1.125 AU gives an orbital period of 1.19 yr, or about 436 days.

An eccentricity of 0.239 makes the orbit moderately elongated.

Its inclination of 3.61° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 35.8 km/s at perihelion and falls to 22 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 = 26.26 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

The current orbit solution is based on 149 observations and has a weighted RMS residual of 0.3856 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
1.125 AU
Eccentricity
0.2386
Perihelion
0.857 AU
Aphelion
1.393425 AU
Inclination
3.61°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
337.92°

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
2032-Jun-02 20:00 0.150283 AU
22481977 km
6.03 km/s
2032-Nov-10 16:09 0.316200 AU
47302908 km
6.47 km/s
2038-Apr-10 04:35 0.031490 AU
4710893 km
7.41 km/s
2038-Dec-02 23:20 0.379932 AU
56837015 km
7.68 km/s
2044-Mar-29 12:03 0.080670 AU
12068134 km
13.80 km/s
2045-Oct-06 23:37 0.225790 AU
33777651 km
18.83 km/s
2063-Jun-28 22:08 0.167100 AU
24997876 km
6.54 km/s
2063-Oct-29 22:46 0.261318 AU
39092578 km
5.54 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
26.26

Orbit Quality

RMS
0.38559
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.