SpaceAtlas Space Object Data
NASA JPL SBDB · 2026 FN9

2026 FN9

2026 FN9 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.598 AU it takes 2.02 yr to circle the Sun.

Apollo Observations: 26
Orbital Period · P
2.02 yr
v(q)
35.2 km/s
v(Q)
15.8 km/s
Diameter · ≈
0.04 km
TJ
4.22
Eccentricity · e
0.3807

Orbit and dynamics

The path is an ellipse reaching 0.99 AU from the Sun at perihelion and 2.206 AU at aphelion, a radial span of 1.216 AU.

Applying Kepler's third law to a = 1.598 AU gives an orbital period of 2.02 yr, or about 738 days.

An eccentricity of 0.381 makes the orbit moderately elongated.

A steep inclination of 20.42° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 35.2 km/s at perihelion and falls to 15.8 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 = 24.57 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

The current orbit solution is based on 26 observations and has a weighted RMS residual of 0.5521 arcseconds.

Condition code U = 8 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
1.598 AU
Eccentricity
0.3807
Perihelion
0.99 AU
Aphelion
2.206359 AU
Inclination
20.42°
Orbital Period
— yr
Epoch
2461123.5
Mean Anomaly
339.14°

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
2028-Apr-01 00:13 0.104805 AU
15678598 km
11.37 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
24.57

Orbit Quality

RMS
0.55214
Condition
8
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.

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