SpaceAtlas Space Object Data
NASA JPL SBDB · 2012 TR231

2012 TR231

2012 TR231 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.839 AU and a period of 0.77 yr.

Aten Observations: 46
Orbital Period · P
0.77 yr
v(q)
43.9 km/s
v(Q)
24.1 km/s
Diameter · ≈
0.06 km
TJ
6.84
Eccentricity · e
0.2911

Orbit and dynamics

Between its closest point (0.595 AU) and its farthest (1.083 AU), the heliocentric distance changes by 0.488 AU over every revolution.

One full revolution takes 0.77 yr (281 days), computed from the semi-major axis of 0.839 AU.

An eccentricity of 0.291 makes the orbit moderately elongated.

A steep inclination of 33.44° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 43.9 km/s at perihelion and falls to 24.1 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 = 23.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

Astrometry from 46 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4754 arcseconds.

Condition code U = 7 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
0.8389 AU
Eccentricity
0.2911
Perihelion
0.595 AU
Aphelion
1.083104 AU
Inclination
33.44°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
117.81°

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-Apr-10 22:46 0.403358 AU
60341563 km
24.96 km/s
2029-Oct-12 22:38 0.397973 AU
59535875 km
24.31 km/s
2032-May-20 20:49 0.454220 AU
67950303 km
23.19 km/s
2032-Oct-15 06:38 0.100120 AU
14977774 km
17.13 km/s
2035-Oct-08 20:19 0.191447 AU
28640004 km
17.72 km/s
2042-Oct-16 05:40 0.121128 AU
18120554 km
17.68 km/s
2045-Oct-09 10:35 0.141756 AU
21206415 km
17.23 km/s
2052-Oct-15 22:40 0.136404 AU
20405687 km
18.28 km/s
2055-Oct-10 22:52 0.129620 AU
19390840 km
16.89 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
23.9

Orbit Quality

RMS
0.47537
Condition
7
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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