SpaceAtlas Space Object Data
NASA JPL SBDB · 2005 RA3

2005 RA3

2005 RA3 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.462 AU it takes 1.77 yr to circle the Sun.

Apollo Observations: 34
Orbital Period · P
1.77 yr
v(q)
34.6 km/s
v(Q)
17.6 km/s
Diameter · ≈
0.12 km
TJ
4.55
Eccentricity · e
0.3264

Orbit and dynamics

The path is an ellipse reaching 0.985 AU from the Sun at perihelion and 1.939 AU at aphelion, a radial span of 0.954 AU.

Applying Kepler's third law to a = 1.462 AU gives an orbital period of 1.77 yr, or about 646 days.

An eccentricity of 0.326 makes the orbit moderately elongated.

The orbital plane is tilted 6.76° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.6 km/s at perihelion and falls to 17.6 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 = 22.3 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 34 observations and has a weighted RMS residual of 0.6359 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
1.462 AU
Eccentricity
0.3264
Perihelion
0.985 AU
Aphelion
1.939197 AU
Inclination
6.76°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
230.09°

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-Sep-28 23:33 0.070816 AU
10593907 km
8.54 km/s
2035-Dec-25 02:04 0.189310 AU
28320395 km
10.36 km/s
2051-Sep-10 13:44 0.366063 AU
54762246 km
17.17 km/s
2052-Feb-14 02:15 0.474974 AU
71055093 km
6.77 km/s
2058-Oct-09 05:25 0.049537 AU
7410675 km
6.38 km/s
2065-Aug-28 16:09 0.370824 AU
55474482 km
4.08 km/s
2065-Dec-30 18:46 0.232359 AU
34760457 km
12.84 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
22.3

Orbit Quality

RMS
0.63585
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.

Keep exploring

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