SpaceAtlas Space Object Data
NASA JPL SBDB · 2016 TC18

2016 TC18

2016 TC18 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.285 AU once every 1.46 yr.

Amor Observations: 35
Orbital Period · P
1.46 yr
v(q)
31.7 km/s
v(Q)
21.7 km/s
Diameter · ≈
0.07 km
TJ
5.02
Eccentricity · e
0.1872

Orbit and dynamics

Between its closest point (1.045 AU) and its farthest (1.526 AU), the heliocentric distance changes by 0.481 AU over every revolution.

One full revolution takes 1.46 yr (532 days), computed from the semi-major axis of 1.285 AU.

An eccentricity of 0.187 makes the orbit moderately elongated.

The orbital plane is tilted 8.29° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 31.7 km/s at perihelion and falls to 21.7 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 = 23.61 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.07 km.

Observation record and orbit quality

Astrometry from 35 individual observations underpins this orbit; the fit leaves an RMS residual of 0.7157 arcseconds.

Condition code U = 5 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
1.285 AU
Eccentricity
0.1872
Perihelion
1.045 AU
Aphelion
1.525552 AU
Inclination
8.29°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
187.4°

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-Jul-06 02:26 0.484157 AU
72428806 km
6.88 km/s
2032-Sep-11 14:55 0.296652 AU
44378465 km
3.75 km/s
2035-Nov-02 09:39 0.201102 AU
30084362 km
8.59 km/s
2039-Apr-07 12:26 0.424979 AU
63575985 km
7.42 km/s
2048-Aug-11 04:27 0.383936 AU
57435980 km
4.83 km/s
2051-Nov-05 16:31 0.073493 AU
10994338 km
5.15 km/s
2055-Mar-25 01:16 0.376811 AU
56370154 km
6.68 km/s
2058-May-05 03:34 0.491794 AU
73571393 km
8.25 km/s
2064-Jul-27 00:07 0.416628 AU
62326679 km
5.68 km/s
2067-Nov-03 17:20 0.112998 AU
16904298 km
4.52 km/s
2070-Oct-24 02:36 0.370880 AU
55482921 km
14.95 km/s
2071-Mar-11 19:16 0.322444 AU
48236927 km
5.75 km/s
2074-Apr-25 03:53 0.463280 AU
69305680 km
8.08 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
23.61

Orbit Quality

RMS
0.71568
Condition
5
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

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