SpaceAtlas Space Object Data
NASA JPL SBDB · 2003 UL9

2003 UL9

2003 UL9 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.011 AU it takes 1.02 yr to circle the Sun.

Apollo Observations: 24
Orbital Period · P
1.02 yr
v(q)
37.4 km/s
v(Q)
23.5 km/s
Diameter · ≈
0.12 km
TJ
5.54
Eccentricity · e
0.2294

Orbit and dynamics

The path is an ellipse reaching 0.779 AU from the Sun at perihelion and 1.243 AU at aphelion, a radial span of 0.464 AU.

Applying Kepler's third law to a = 1.011 AU gives an orbital period of 1.02 yr, or about 371 days.

An eccentricity of 0.229 makes the orbit moderately elongated.

A steep inclination of 62.87° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 37.4 km/s at perihelion and falls to 23.5 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 = 22.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.12 km.

Observation record and orbit quality

The current orbit solution is based on 24 observations and has a weighted RMS residual of 0.5197 arcseconds.

Condition code U = 9 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
1.011 AU
Eccentricity
0.2294
Perihelion
0.779 AU
Aphelion
1.242923 AU
Inclination
62.87°
Orbital Period
— yr
Epoch
2452934.5
Mean Anomaly
110.59°

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
22.4

Orbit Quality

RMS
0.51969
Condition
9
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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