SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 FF128

2017 FF128

2017 FF128 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.161 AU it takes 3.18 yr to circle the Sun.

Apollo Observations: 21
Orbital Period · P
3.18 yr
v(q)
38.8 km/s
v(Q)
10.6 km/s
Diameter · ≈
0.03 km
TJ
3.46
Eccentricity · e
0.5714

Orbit and dynamics

The path is an ellipse reaching 0.926 AU from the Sun at perihelion and 3.396 AU at aphelion, a radial span of 2.47 AU.

Applying Kepler's third law to a = 2.161 AU gives an orbital period of 3.18 yr, or about 1,160 days.

The high eccentricity (0.571) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 6.67° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.8 km/s at perihelion and falls to 10.6 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 = 25.61 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

The current orbit solution is based on 21 observations and has a weighted RMS residual of 0.5042 arcseconds.

Condition code U = 5 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
2.161 AU
Eccentricity
0.5714
Perihelion
0.926 AU
Aphelion
3.395795 AU
Inclination
6.67°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
310.02°

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-Jun-14 19:13 0.120598 AU
18041216 km
10.01 km/s
2055-Jul-21 03:57 0.144644 AU
21638397 km
15.62 km/s
2071-Mar-21 20:49 0.179361 AU
26832014 km
19.37 km/s
2074-Aug-07 18:32 0.385101 AU
57610300 km
24.22 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
25.61

Orbit Quality

RMS
0.50423
Condition
5
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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