SpaceAtlas Space Object Data
NASA JPL SBDB · 2025 FD18

2025 FD18

2025 FD18 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.111 AU it takes 3.07 yr to circle the Sun.

Apollo Observations: 51
Orbital Period · P
3.07 yr
v(q)
69.2 km/s
v(Q)
6.1 km/s
Diameter · ≈
0.47 km
TJ
3.14
Eccentricity · e
0.8385

Orbit and dynamics

Between its closest point (0.341 AU) and its farthest (3.881 AU), the heliocentric distance changes by 3.54 AU over every revolution.

One full revolution takes 3.07 yr (1,120 days), computed from the semi-major axis of 2.111 AU.

The high eccentricity (0.839) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 12.29° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 69.2 km/s at perihelion and falls to 6.1 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 = 19.38 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.47 km.

Observation record and orbit quality

Astrometry from 51 individual observations underpins this orbit; the fit leaves an RMS residual of 0.6657 arcseconds.

Condition code U = 1 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.

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
2.111 AU
Eccentricity
0.8385
Perihelion
0.341 AU
Aphelion
3.881074 AU
Inclination
12.29°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
174.59°

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
2031-Mar-15 16:12 0.192737 AU
28833047 km
26.50 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
19.38

Orbit Quality

RMS
0.66575
Condition
1
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

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