SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 YH28

2011 YH28

2011 YH28 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.611 AU it takes 4.22 yr to circle the Sun.

Apollo Observations: 71
Orbital Period · P
4.22 yr
v(q)
45.4 km/s
v(Q)
7.5 km/s
Diameter · ≈
0.28 km
TJ
2.97
Eccentricity · e
0.7169

Orbit and dynamics

The path is an ellipse reaching 0.739 AU from the Sun at perihelion and 4.483 AU at aphelion, a radial span of 3.744 AU.

Applying Kepler's third law to a = 2.611 AU gives an orbital period of 4.22 yr, or about 1,541 days.

The high eccentricity (0.717) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 8.74° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 45.4 km/s at perihelion and falls to 7.5 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 = 20.55 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.28 km.

Observation record and orbit quality

The current orbit solution is based on 71 observations and has a weighted RMS residual of 0.4804 arcseconds.

Condition code U = 5 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
2.611 AU
Eccentricity
0.7169
Perihelion
0.739 AU
Aphelion
4.482826 AU
Inclination
8.74°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
125.86°

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
2029-Jan-24 11:47 0.351273 AU
52549683 km
29.14 km/s
2033-Jul-08 05:44 0.030642 AU
4583985 km
20.07 km/s
2050-Jun-23 21:03 0.055954 AU
8370648 km
16.11 km/s
2067-Jul-15 16:25 0.179150 AU
26800417 km
24.19 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
20.55

Orbit Quality

RMS
0.48042
Condition
5
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.

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