SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 RO9

2013 RO9

2013 RO9 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.086 AU it takes 1.13 yr to circle the Sun.

Apollo Observations: 15
Orbital Period · P
1.13 yr
v(q)
41.1 km/s
v(Q)
19.9 km/s
Diameter · ≈
0.07 km
TJ
5.64
Eccentricity · e
0.3481

Orbit and dynamics

Between its closest point (0.708 AU) and its farthest (1.464 AU), the heliocentric distance changes by 0.756 AU over every revolution.

One full revolution takes 1.13 yr (413 days), computed from the semi-major axis of 1.086 AU.

An eccentricity of 0.348 makes the orbit moderately elongated.

The orbital plane is tilted 7.45° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 41.1 km/s at perihelion and falls to 19.9 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 = 23.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.07 km.

Observation record and orbit quality

Astrometry from 15 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5514 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
1.086 AU
Eccentricity
0.3481
Perihelion
0.708 AU
Aphelion
1.464037 AU
Inclination
7.45°
Orbital Period
— yr
Epoch
2456538.5
Mean Anomaly
99.16°

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
2047-Aug-06 14:59 0.163242 AU
24420641 km
6.94 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
23.5

Orbit Quality

RMS
0.55139
Condition
9
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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