SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 TM4

2013 TM4

2013 TM4 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.512 AU once every 3.98 yr.

Amor Observations: 84
Orbital Period · P
3.98 yr
v(q)
36.6 km/s
v(Q)
9.7 km/s
Diameter · ≈
0.05 km
TJ
3.2
Eccentricity · e
0.5825

Orbit and dynamics

The path is an ellipse reaching 1.049 AU from the Sun at perihelion and 3.975 AU at aphelion, a radial span of 2.926 AU.

Applying Kepler's third law to a = 2.512 AU gives an orbital period of 3.98 yr, or about 1,454 days.

The high eccentricity (0.583) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 0.83° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 36.6 km/s at perihelion and falls to 9.7 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 = 24.37 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

The current orbit solution is based on 84 observations and has a weighted RMS residual of 0.5184 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
2.512 AU
Eccentricity
0.5825
Perihelion
1.049 AU
Aphelion
3.97524 AU
Inclination
0.83°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
70.99°

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-03 07:28 0.113132 AU
16924294 km
10.30 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
24.37

Orbit Quality

RMS
0.51845
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.