SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 ER3

2018 ER3

2018 ER3 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.045 AU once every 2.92 yr.

Amor Observations: 8
Orbital Period · P
2.92 yr
v(q)
35.6 km/s
v(Q)
12.2 km/s
Diameter · ≈
0.03 km
TJ
3.63
Eccentricity · e
0.4908

Orbit and dynamics

Between its closest point (1.041 AU) and its farthest (3.049 AU), the heliocentric distance changes by 2.008 AU over every revolution.

One full revolution takes 2.92 yr (1,068 days), computed from the semi-major axis of 2.045 AU.

The high eccentricity (0.491) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.29° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.6 km/s at perihelion and falls to 12.2 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 = 25.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 8 individual observations underpins this orbit; the fit leaves an RMS residual of 0.7732 arcseconds.

Condition code U = 9 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
2.045 AU
Eccentricity
0.4908
Perihelion
1.041 AU
Aphelion
3.048686 AU
Inclination
5.29°
Orbital Period
— yr
Epoch
2458185.5
Mean Anomaly
349.96°

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
25.6

Orbit Quality

RMS
0.77325
Condition
9
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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