SpaceAtlas Space Object Data
NASA JPL SBDB · 2005 RO33

2005 RO33

2005 RO33 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.925 AU once every 2.67 yr.

Amor Observations: 327
Orbital Period · P
2.67 yr
v(q)
33.1 km/s
v(Q)
13.9 km/s
Diameter · ≈
0.34 km
TJ
3.8
Eccentricity · e
0.4086

Orbit and dynamics

Between its closest point (1.138 AU) and its farthest (2.712 AU), the heliocentric distance changes by 1.574 AU over every revolution.

One full revolution takes 2.67 yr (976 days), computed from the semi-major axis of 1.925 AU.

The high eccentricity (0.409) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 7.31° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.1 km/s at perihelion and falls to 13.9 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 = 20.12 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.34 km.

Observation record and orbit quality

Astrometry from 327 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4109 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
1.925 AU
Eccentricity
0.4086
Perihelion
1.138 AU
Aphelion
2.711555 AU
Inclination
7.31°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
281.01°

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
2029-Aug-27 08:52 0.167323 AU
25031177 km
4.63 km/s
2037-Aug-29 09:18 0.198018 AU
29623016 km
4.47 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
20.12

Orbit Quality

RMS
0.41089
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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.