SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 PF2

2021 PF2

2021 PF2 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.615 AU once every 2.05 yr.

Amor Observations: 101
Orbital Period · P
2.05 yr
v(q)
33.9 km/s
v(Q)
16.2 km/s
Diameter · ≈
0.05 km
TJ
4.26
Eccentricity · e
0.3535

Orbit and dynamics

The path is an ellipse reaching 1.044 AU from the Sun at perihelion and 2.186 AU at aphelion, a radial span of 1.142 AU.

Applying Kepler's third law to a = 1.615 AU gives an orbital period of 2.05 yr, or about 750 days.

An eccentricity of 0.353 makes the orbit moderately elongated.

Its inclination of 2.79° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 33.9 km/s at perihelion and falls to 16.2 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 24.36 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

The current orbit solution is based on 101 observations and has a weighted RMS residual of 0.5753 arcseconds.

Condition code U = 4 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
1.615 AU
Eccentricity
0.3535
Perihelion
1.044 AU
Aphelion
2.185903 AU
Inclination
2.79°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
103.19°

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
2058-Aug-09 19:54 0.414529 AU
62012726 km
16.49 km/s
2058-Dec-13 17:32 0.479121 AU
71675538 km
4.44 km/s
2060-Sep-04 04:08 0.107718 AU
16114337 km
6.85 km/s
2062-Oct-29 15:35 0.167190 AU
25011247 km
9.06 km/s
2064-Nov-17 16:56 0.487964 AU
72998308 km
18.69 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
24.36

Orbit Quality

RMS
0.57527
Condition
4
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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