SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 AF5

2021 AF5

2021 AF5 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.936 AU and a period of 0.91 yr.

Aten Observations: 81
Orbital Period · P
0.91 yr
v(q)
33.1 km/s
v(Q)
28.7 km/s
Diameter · ≈
0.04 km
TJ
6.4
Eccentricity · e
0.0714

Orbit and dynamics

The path is an ellipse reaching 0.869 AU from the Sun at perihelion and 1.003 AU at aphelion, a radial span of 0.134 AU.

Applying Kepler's third law to a = 0.936 AU gives an orbital period of 0.91 yr, or about 331 days.

With e = 0.071, the orbit is close to circular.

Its inclination of 4.25° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 33.1 km/s at perihelion and falls to 28.7 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 = 24.82 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 81 observations and has a weighted RMS residual of 0.3545 arcseconds.

Condition code U = 6 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
0.936 AU
Eccentricity
0.0714
Perihelion
0.869 AU
Aphelion
1.00283 AU
Inclination
4.25°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
133.18°

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
2030-Jan-01 22:55 0.352080 AU
52670450 km
13.30 km/s
2030-Sep-03 21:26 0.144504 AU
21617440 km
3.82 km/s
2031-Mar-14 05:08 0.150110 AU
22456102 km
6.45 km/s
2039-Dec-29 06:25 0.058863 AU
8805830 km
4.60 km/s
2040-Jun-12 23:31 0.119411 AU
17863665 km
3.50 km/s
2041-Mar-08 22:34 0.414068 AU
61943642 km
14.98 km/s
2049-Jan-06 04:35 0.478439 AU
71573528 km
17.14 km/s
2050-Feb-17 14:01 0.051757 AU
7742801 km
2.90 km/s
2058-Dec-28 10:43 0.137898 AU
20629207 km
7.32 km/s
2059-Jul-10 12:18 0.136126 AU
20364085 km
4.14 km/s
2060-Mar-10 18:27 0.320706 AU
47976988 km
12.55 km/s
2068-Jan-05 23:31 0.421791 AU
63099005 km
16.19 km/s
2069-Mar-06 19:14 0.065921 AU
9861688 km
3.79 km/s
2077-Dec-30 05:33 0.057508 AU
8603137 km
4.06 km/s
2078-Jun-06 00:50 0.118086 AU
17665367 km
3.27 km/s
2079-Mar-09 03:19 0.453605 AU
67858403 km
15.82 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
24.82

Orbit Quality

RMS
0.35455
Condition
6
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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