SpaceAtlas Space Object Data
NASA JPL SBDB · 2005 YL128

2005 YL128

2005 YL128 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.355 AU it takes 1.58 yr to circle the Sun.

Apollo Observations: 75
Orbital Period · P
1.58 yr
v(q)
41.4 km/s
v(Q)
15.8 km/s
Diameter · ≈
0.23 km
TJ
4.71
Eccentricity · e
0.4471

Orbit and dynamics

The path is an ellipse reaching 0.749 AU from the Sun at perihelion and 1.961 AU at aphelion, a radial span of 1.212 AU.

Applying Kepler's third law to a = 1.355 AU gives an orbital period of 1.58 yr, or about 576 days.

The high eccentricity (0.447) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 18.45° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 41.4 km/s at perihelion and falls to 15.8 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 = 20.96 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 75 observations and has a weighted RMS residual of 0.5163 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
1.355 AU
Eccentricity
0.4471
Perihelion
0.749 AU
Aphelion
1.960821 AU
Inclination
18.45°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
267.76°

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
2028-Jul-11 04:40 0.147765 AU
22105274 km
14.71 km/s
2039-Aug-02 14:32 0.195110 AU
29188013 km
19.16 km/s
2069-Jul-16 08:20 0.132971 AU
19892161 km
15.24 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
20.96

Orbit Quality

RMS
0.5163
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.

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