SpaceAtlas Space Object Data
NASA JPL SBDB · 2025 FH21

2025 FH21

2025 FH21 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.107 AU it takes 1.16 yr to circle the Sun.

Apollo Observations: 31
Orbital Period · P
1.16 yr
v(q)
31 km/s
v(Q)
25.8 km/s
Diameter · ≈
0.01 km
TJ
5.57
Eccentricity · e
0.0923

Orbit and dynamics

The path is an ellipse reaching 1.005 AU from the Sun at perihelion and 1.209 AU at aphelion, a radial span of 0.204 AU.

Applying Kepler's third law to a = 1.107 AU gives an orbital period of 1.16 yr, or about 425 days.

With e = 0.092, the orbit is close to circular.

The orbital plane is tilted 19.86° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 31 km/s at perihelion and falls to 25.8 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 27.39 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

The current orbit solution is based on 31 observations and has a weighted RMS residual of 0.3311 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
1.107 AU
Eccentricity
0.0923
Perihelion
1.005 AU
Aphelion
1.209176 AU
Inclination
19.86°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
16.8°

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
27.39

Orbit Quality

RMS
0.33111
Condition
7
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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