SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 YK4

2020 YK4

2020 YK4 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.09 AU once every 1.14 yr.

Amor Observations: 32
Orbital Period · P
1.14 yr
v(q)
30 km/s
v(Q)
27.2 km/s
Diameter · ≈
0.04 km
TJ
5.57
Eccentricity · e
0.0494

Orbit and dynamics

Between its closest point (1.036 AU) and its farthest (1.144 AU), the heliocentric distance changes by 0.108 AU over every revolution.

One full revolution takes 1.14 yr (416 days), computed from the semi-major axis of 1.09 AU.

With e = 0.049, the orbit is close to circular.

A steep inclination of 29.12° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 30 km/s at perihelion and falls to 27.2 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 = 24.82 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

Astrometry from 32 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4625 arcseconds.

Condition code U = 8 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
1.09 AU
Eccentricity
0.0494
Perihelion
1.036 AU
Aphelion
1.143846 AU
Inclination
29.12°
Orbital Period
— yr
Epoch
2459209.5
Mean Anomaly
6.44°

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-Dec-23 22:38 0.073803 AU
11040838 km
16.12 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
0.46245
Condition
8
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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.