SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 ER

2020 ER

2020 ER belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.146 AU it takes 1.23 yr to circle the Sun.

Apollo Observations: 56
Orbital Period · P
1.23 yr
v(q)
31.5 km/s
v(Q)
24.6 km/s
Diameter · ≈
0.01 km
TJ
5.47
Eccentricity · e
0.1232

Orbit and dynamics

Between its closest point (1.005 AU) and its farthest (1.287 AU), the heliocentric distance changes by 0.282 AU over every revolution.

One full revolution takes 1.23 yr (448 days), computed from the semi-major axis of 1.146 AU.

An eccentricity of 0.123 makes the orbit moderately elongated.

Its inclination of 4.44° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 31.5 km/s at perihelion and falls to 24.6 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 27 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 56 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3274 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
1.146 AU
Eccentricity
0.1232
Perihelion
1.005 AU
Aphelion
1.287187 AU
Inclination
4.44°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
53.02°

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
2030-Oct-29 20:20 0.191251 AU
28610764 km
3.74 km/s
2031-Mar-31 00:32 0.206209 AU
30848454 km
8.98 km/s
2036-Jan-15 02:38 0.285248 AU
42672528 km
11.18 km/s
2036-Jun-27 05:11 0.226537 AU
33889498 km
3.77 km/s
2041-Sep-19 19:19 0.250341 AU
37450514 km
5.06 km/s
2042-Apr-15 01:24 0.433260 AU
64814831 km
16.28 km/s
2052-Aug-26 17:35 0.271927 AU
40679662 km
5.21 km/s
2058-Mar-11 20:48 0.015640 AU
2339677 km
3.11 km/s
2063-Jan-08 22:09 0.399402 AU
59749637 km
14.96 km/s
2069-Apr-15 23:39 0.410920 AU
61472687 km
16.34 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
27.0

Orbit Quality

RMS
0.32744
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.