SpaceAtlas Space Object Data
NASA JPL SBDB · 2012 TT145

2012 TT145

2012 TT145 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.139 AU once every 3.13 yr.

Amor Observations: 33
Orbital Period · P
3.13 yr
v(q)
33.4 km/s
v(Q)
12.4 km/s
Diameter · ≈
0.27 km
TJ
3.56
Eccentricity · e
0.4585

Orbit and dynamics

The path is an ellipse reaching 1.158 AU from the Sun at perihelion and 3.12 AU at aphelion, a radial span of 1.962 AU.

Applying Kepler's third law to a = 2.139 AU gives an orbital period of 3.13 yr, or about 1,143 days.

The high eccentricity (0.459) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 7.71° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.4 km/s at perihelion and falls to 12.4 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 = 20.56 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.27 km.

Observation record and orbit quality

The current orbit solution is based on 33 observations and has a weighted RMS residual of 0.3636 arcseconds.

Condition code U = 1 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
2.139 AU
Eccentricity
0.4585
Perihelion
1.158 AU
Aphelion
3.119731 AU
Inclination
7.71°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
157.34°

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
2037-Aug-03 18:18 0.443036 AU
66277266 km
11.51 km/s
2040-Sep-10 09:22 0.464435 AU
69478529 km
14.24 km/s
2062-Aug-08 03:47 0.410389 AU
61393345 km
10.33 km/s
2065-Sep-09 20:11 0.479065 AU
71667135 km
14.28 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
20.56

Orbit Quality

RMS
0.3636
Condition
1
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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