SpaceAtlas Space Object Data
NASA JPL SBDB · 2022 SK21

2022 SK21

2022 SK21 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.317 AU once every 1.51 yr.

Amor Observations: 53
Orbital Period · P
1.51 yr
v(q)
31.3 km/s
v(Q)
21.6 km/s
Diameter · ≈
0.03 km
TJ
4.94
Eccentricity · e
0.1836

Orbit and dynamics

The path is an ellipse reaching 1.075 AU from the Sun at perihelion and 1.559 AU at aphelion, a radial span of 0.484 AU.

Applying Kepler's third law to a = 1.317 AU gives an orbital period of 1.51 yr, or about 552 days.

An eccentricity of 0.184 makes the orbit moderately elongated.

Its inclination of 2.87° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 31.3 km/s at perihelion and falls to 21.6 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 = 25.6 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 53 observations and has a weighted RMS residual of 0.4939 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
1.317 AU
Eccentricity
0.1836
Perihelion
1.075 AU
Aphelion
1.558801 AU
Inclination
2.87°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
144.12°

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-Aug-15 00:02 0.249053 AU
37257762 km
1.86 km/s
2031-Jul-20 06:40 0.330171 AU
49392859 km
3.80 km/s
2034-Jul-01 14:02 0.393776 AU
58908046 km
5.12 km/s
2037-Jun-16 06:10 0.444379 AU
66478219 km
6.14 km/s
2040-Jun-02 22:53 0.484546 AU
72487010 km
6.87 km/s
2067-Feb-27 09:59 0.466042 AU
69718819 km
6.95 km/s
2070-Feb-14 07:08 0.422832 AU
63254702 km
6.21 km/s
2073-Jan-30 03:36 0.368776 AU
55168094 km
5.15 km/s
2076-Jan-12 02:15 0.302095 AU
45192739 km
3.67 km/s
2078-Dec-13 23:01 0.216144 AU
32334696 km
1.36 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
25.6

Orbit Quality

RMS
0.49391
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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