SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 YZ28

2011 YZ28

2011 YZ28 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.243 AU once every 3.36 yr.

Amor Observations: 36
Orbital Period · P
3.36 yr
v(q)
33.3 km/s
v(Q)
11.9 km/s
Diameter · ≈
0.11 km
TJ
3.46
Eccentricity · e
0.4738

Orbit and dynamics

The path is an ellipse reaching 1.18 AU from the Sun at perihelion and 3.306 AU at aphelion, a radial span of 2.126 AU.

Applying Kepler's third law to a = 2.243 AU gives an orbital period of 3.36 yr, or about 1,227 days.

The high eccentricity (0.474) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 9.96° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.3 km/s at perihelion and falls to 11.9 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 = 22.47 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.11 km.

Observation record and orbit quality

The current orbit solution is based on 36 observations and has a weighted RMS residual of 0.5944 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
2.243 AU
Eccentricity
0.4738
Perihelion
1.18 AU
Aphelion
3.305733 AU
Inclination
9.96°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
114.75°

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
2058-Dec-22 14:53 0.214749 AU
32125919 km
6.15 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
22.47

Orbit Quality

RMS
0.59435
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

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