SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 TT2

2018 TT2

2018 TT2 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.271 AU it takes 1.43 yr to circle the Sun.

Apollo Observations: 58
Orbital Period · P
1.43 yr
v(q)
37.1 km/s
v(Q)
18.8 km/s
Diameter · ≈
0.1 km
TJ
5.02
Eccentricity · e
0.3275

Orbit and dynamics

The path is an ellipse reaching 0.855 AU from the Sun at perihelion and 1.687 AU at aphelion, a radial span of 0.832 AU.

Applying Kepler's third law to a = 1.271 AU gives an orbital period of 1.43 yr, or about 523 days.

An eccentricity of 0.328 makes the orbit moderately elongated.

The orbital plane is tilted 8.64° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 37.1 km/s at perihelion and falls to 18.8 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 = 22.8 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.1 km.

Observation record and orbit quality

The current orbit solution is based on 58 observations and has a weighted RMS residual of 0.489 arcseconds.

Condition code U = 3 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
1.271 AU
Eccentricity
0.3275
Perihelion
0.855 AU
Aphelion
1.687253 AU
Inclination
8.64°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
59.51°

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
2028-Oct-19 14:53 0.310200 AU
46405286 km
6.19 km/s
2029-Feb-12 04:10 0.153023 AU
22891879 km
7.38 km/s
2038-Sep-30 13:12 0.420870 AU
62961268 km
7.89 km/s
2039-Mar-24 22:59 0.015261 AU
2282957 km
9.09 km/s
2041-Oct-24 01:48 0.410424 AU
61398487 km
20.36 km/s
2048-Sep-21 17:21 0.463872 AU
69394311 km
8.51 km/s
2049-Apr-01 17:12 0.076580 AU
11456265 km
11.57 km/s
2051-Oct-30 00:16 0.296307 AU
44326916 km
17.07 km/s
2059-Apr-11 00:17 0.210237 AU
31450972 km
15.43 km/s
2061-Nov-05 01:16 0.176259 AU
26367909 km
13.05 km/s
2069-Apr-17 07:15 0.330107 AU
49383317 km
18.88 km/s
2071-Nov-11 11:43 0.121433 AU
18166175 km
9.64 km/s
2072-May-18 02:53 0.465329 AU
69612262 km
7.04 km/s
2079-Apr-22 21:53 0.425462 AU
63648181 km
21.65 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
22.8

Orbit Quality

RMS
0.48903
Condition
3
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.