SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 KY15

2011 KY15

2011 KY15 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.649 AU and a period of 0.52 yr.

Aten Observations: 29
Orbital Period · P
0.52 yr
v(q)
74.2 km/s
v(Q)
18.4 km/s
Diameter · ≈
0.05 km
TJ
8.56
Eccentricity · e
0.603

Orbit and dynamics

Between its closest point (0.258 AU) and its farthest (1.04 AU), the heliocentric distance changes by 0.782 AU over every revolution.

One full revolution takes 0.52 yr (191 days), computed from the semi-major axis of 0.649 AU.

The high eccentricity (0.603) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 16.87° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 74.2 km/s at perihelion and falls to 18.4 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 = 24.42 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 29 individual observations underpins this orbit; the fit leaves an RMS residual of 0.507 arcseconds.

Condition code U = 8 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
0.6487 AU
Eccentricity
0.603
Perihelion
0.258 AU
Aphelion
1.039866 AU
Inclination
16.87°
Orbital Period
— yr
Epoch
2455710.5
Mean Anomaly
170.63°

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
2070-May-17 11:03 0.050556 AU
7563008 km
19.28 km/s
2078-Jun-07 05:07 0.176217 AU
26361763 km
24.14 km/s
2079-Jun-11 11:33 0.100691 AU
15063202 km
16.43 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
24.42

Orbit Quality

RMS
0.50703
Condition
8
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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