SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 YC

2021 YC

2021 YC belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.277 AU it takes 1.44 yr to circle the Sun.

Apollo Observations: 67
Orbital Period · P
1.44 yr
v(q)
33.1 km/s
v(Q)
21 km/s
Diameter · ≈
0.02 km
TJ
5.03
Eccentricity · e
0.2237

Orbit and dynamics

Between its closest point (0.992 AU) and its farthest (1.563 AU), the heliocentric distance changes by 0.571 AU over every revolution.

One full revolution takes 1.44 yr (527 days), computed from the semi-major axis of 1.277 AU.

An eccentricity of 0.224 makes the orbit moderately elongated.

The orbital plane is tilted 6.64° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.1 km/s at perihelion and falls to 21 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 = 25.8 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 67 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3735 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
1.277 AU
Eccentricity
0.2237
Perihelion
0.992 AU
Aphelion
1.562665 AU
Inclination
6.64°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
41.11°

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
2031-Jul-26 01:51 0.450661 AU
67417854 km
7.32 km/s
2038-Apr-30 17:03 0.486821 AU
72827397 km
7.78 km/s
2044-Aug-15 05:52 0.364224 AU
54487078 km
5.80 km/s
2045-Jan-29 04:49 0.353250 AU
52845410 km
15.88 km/s
2047-Oct-23 06:38 0.211621 AU
31658018 km
12.04 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
25.8

Orbit Quality

RMS
0.37346
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.