SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 YL63

2011 YL63

2011 YL63 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.847 AU it takes 2.51 yr to circle the Sun.

Apollo Observations: 64
Orbital Period · P
2.51 yr
v(q)
76.2 km/s
v(Q)
6.3 km/s
Diameter · ≈
0.23 km
TJ
3.42
Eccentricity · e
0.8474

Orbit and dynamics

The path is an ellipse reaching 0.282 AU from the Sun at perihelion and 3.412 AU at aphelion, a radial span of 3.13 AU.

Applying Kepler's third law to a = 1.847 AU gives an orbital period of 2.51 yr, or about 917 days.

The high eccentricity (0.847) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 19.05° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 76.2 km/s at perihelion and falls to 6.3 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 = 20.91 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.23 km.

Observation record and orbit quality

The current orbit solution is based on 64 observations and has a weighted RMS residual of 0.5413 arcseconds.

Condition code U = 0 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.

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
1.847 AU
Eccentricity
0.8474
Perihelion
0.282 AU
Aphelion
3.412148 AU
Inclination
19.05°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
300.98°

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-15 07:45 0.235377 AU
35211853 km
36.31 km/s
2029-Apr-01 07:39 0.335411 AU
50176722 km
28.13 km/s
2031-Dec-21 09:23 0.340877 AU
50994450 km
40.45 km/s
2034-Apr-09 15:28 0.397993 AU
59538837 km
23.99 km/s
2036-Dec-26 21:15 0.461198 AU
68994268 km
44.83 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
20.91

Orbit Quality

RMS
0.54135
Condition
0
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

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