SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 KT4

2009 KT4

2009 KT4 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.278 AU once every 1.44 yr.

Amor Observations: 29
Orbital Period · P
1.44 yr
v(q)
32.4 km/s
v(Q)
21.4 km/s
Diameter · ≈
0.16 km
TJ
5.02
Eccentricity · e
0.2028

Orbit and dynamics

Between its closest point (1.019 AU) and its farthest (1.537 AU), the heliocentric distance changes by 0.518 AU over every revolution.

One full revolution takes 1.44 yr (528 days), computed from the semi-major axis of 1.278 AU.

An eccentricity of 0.203 makes the orbit moderately elongated.

The orbital plane is tilted 11.02° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.4 km/s at perihelion and falls to 21.4 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 = 21.8 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.16 km.

Observation record and orbit quality

Astrometry from 29 individual observations underpins this orbit; the fit leaves an RMS residual of 0.7357 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
1.278 AU
Eccentricity
0.2028
Perihelion
1.019 AU
Aphelion
1.537178 AU
Inclination
11.02°
Orbital Period
— yr
Epoch
2454986.5
Mean Anomaly
43.59°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
21.8

Orbit Quality

RMS
0.73571
Condition
8
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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