SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 YU

2020 YU

2020 YU is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.77 AU and a period of 0.68 yr.

Aten Observations: 44
Orbital Period · P
0.68 yr
v(q)
52.1 km/s
v(Q)
22.1 km/s
Diameter · ≈
0.03 km
TJ
7.36
Eccentricity · e
0.4045

Orbit and dynamics

Between its closest point (0.459 AU) and its farthest (1.082 AU), the heliocentric distance changes by 0.623 AU over every revolution.

One full revolution takes 0.68 yr (247 days), computed from the semi-major axis of 0.77 AU.

The high eccentricity (0.405) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 31.57° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 52.1 km/s at perihelion and falls to 22.1 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 = 25.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 44 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3502 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
0.7701 AU
Eccentricity
0.4045
Perihelion
0.459 AU
Aphelion
1.081605 AU
Inclination
31.57°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
274.4°

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
2026-Dec-05 13:39 0.369394 AU
55260530 km
17.11 km/s
2028-Nov-25 23:09 0.469656 AU
70259497 km
18.83 km/s
2039-Dec-10 09:46 0.420695 AU
62935061 km
28.21 km/s
2041-Dec-15 02:41 0.268622 AU
40185305 km
23.86 km/s
2043-Dec-19 13:35 0.110635 AU
16550816 km
20.06 km/s
2045-Dec-20 14:29 0.008713 AU
1303457 km
17.33 km/s
2047-Dec-18 15:58 0.146655 AU
21939273 km
16.10 km/s
2049-Dec-11 09:01 0.284415 AU
42547871 km
16.39 km/s
2051-Dec-02 07:29 0.404926 AU
60576049 km
17.65 km/s
2062-Dec-09 06:57 0.445103 AU
66586457 km
28.97 km/s
2064-Dec-14 13:10 0.277278 AU
41480258 km
24.22 km/s
2066-Dec-19 08:53 0.109804 AU
16426471 km
20.11 km/s
2068-Dec-20 10:22 0.009999 AU
1495774 km
17.23 km/s
2070-Dec-18 01:23 0.157265 AU
23526470 km
16.06 km/s
2072-Dec-09 22:19 0.298195 AU
44609277 km
16.54 km/s
2074-Nov-30 06:24 0.421446 AU
63047493 km
18.00 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
25.5

Orbit Quality

RMS
0.35017
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.

Keep exploring

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