SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 OC

2009 OC

2009 OC is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.137 AU once every 3.12 yr.

Amor Observations: 402
Orbital Period · P
3.12 yr
v(q)
33 km/s
v(Q)
12.6 km/s
Diameter · ≈
0.32 km
TJ
3.58
Eccentricity · e
0.4471

Orbit and dynamics

Between its closest point (1.181 AU) and its farthest (3.092 AU), the heliocentric distance changes by 1.911 AU over every revolution.

One full revolution takes 3.12 yr (1,141 days), computed from the semi-major axis of 2.137 AU.

The high eccentricity (0.447) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 4.59° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 33 km/s at perihelion and falls to 12.6 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 = 20.24 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.32 km.

Observation record and orbit quality

Astrometry from 402 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4026 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
2.137 AU
Eccentricity
0.4471
Perihelion
1.181 AU
Aphelion
3.092453 AU
Inclination
4.59°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
142.09°

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
2034-Aug-09 03:04 0.301714 AU
45135803 km
6.11 km/s
2059-Sep-11 02:17 0.473778 AU
70876125 km
2.87 km/s
2062-Aug-16 16:09 0.385812 AU
57716588 km
8.91 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
20.24

Orbit Quality

RMS
0.40259
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.

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