SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 RT9

2013 RT9

2013 RT9 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.14 AU once every 1.22 yr.

Amor Observations: 33
Orbital Period · P
1.22 yr
v(q)
30.4 km/s
v(Q)
25.6 km/s
Diameter · ≈
0.02 km
TJ
5.49
Eccentricity · e
0.0849

Orbit and dynamics

Between its closest point (1.043 AU) and its farthest (1.237 AU), the heliocentric distance changes by 0.194 AU over every revolution.

One full revolution takes 1.22 yr (445 days), computed from the semi-major axis of 1.14 AU.

With e = 0.085, the orbit is close to circular.

The orbital plane is tilted 9.02° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 30.4 km/s at perihelion and falls to 25.6 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 = 26.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 33 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3172 arcseconds.

Condition code U = 6 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
1.14 AU
Eccentricity
0.0849
Perihelion
1.043 AU
Aphelion
1.236786 AU
Inclination
9.02°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
173.15°

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
2030-Sep-07 07:23 0.154214 AU
23070140 km
7.89 km/s
2041-Sep-01 13:29 0.001431 AU
214044 km
5.08 km/s
2047-Apr-02 00:43 0.239864 AU
35883106 km
5.61 km/s
2047-Sep-08 17:46 0.353968 AU
52952873 km
12.43 km/s
2052-Aug-20 11:01 0.415854 AU
62210936 km
13.24 km/s
2053-Jan-28 12:12 0.245624 AU
36744848 km
5.68 km/s
2058-Sep-04 04:31 0.049603 AU
7420573 km
4.97 km/s
2064-Mar-09 23:17 0.244340 AU
36552670 km
6.17 km/s
2069-Aug-28 09:22 0.155627 AU
23281494 km
7.57 km/s
2075-Sep-08 07:18 0.230768 AU
34522452 km
10.20 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
26.5

Orbit Quality

RMS
0.31716
Condition
6
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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