SpaceAtlas Space Object Data
NASA JPL SBDB · 2025 ER

2025 ER

2025 ER belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.123 AU it takes 1.19 yr to circle the Sun.

Apollo Observations: 23
Orbital Period · P
1.19 yr
v(q)
36.4 km/s
v(Q)
21.7 km/s
Diameter · ≈
0.05 km
TJ
5.53
Eccentricity · e
0.2529

Orbit and dynamics

Between its closest point (0.839 AU) and its farthest (1.407 AU), the heliocentric distance changes by 0.568 AU over every revolution.

One full revolution takes 1.19 yr (435 days), computed from the semi-major axis of 1.123 AU.

An eccentricity of 0.253 makes the orbit moderately elongated.

Its inclination of 4.01° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 36.4 km/s at perihelion and falls to 21.7 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 = 24.34 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 23 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4389 arcseconds.

Condition code U = 7 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
1.123 AU
Eccentricity
0.2529
Perihelion
0.839 AU
Aphelion
1.407007 AU
Inclination
4.01°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
106.58°

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
2036-Aug-14 02:35 0.057153 AU
8549945 km
10.90 km/s
2061-Aug-13 05:44 0.062094 AU
9289077 km
11.58 km/s
2069-Feb-04 04:18 0.094438 AU
14127776 km
11.78 km/s
2074-Dec-18 03:49 0.119790 AU
17920354 km
5.72 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
24.34

Orbit Quality

RMS
0.43885
Condition
7
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.