SpaceAtlas Space Object Data
NASA JPL SBDB · 2020 TT4

2020 TT4

2020 TT4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.483 AU it takes 1.81 yr to circle the Sun.

Apollo Observations: 28
Orbital Period · P
1.81 yr
v(q)
35.7 km/s
v(Q)
16.8 km/s
Diameter · ≈
0.01 km
TJ
4.49
Eccentricity · e
0.3602

Orbit and dynamics

The path is an ellipse reaching 0.949 AU from the Sun at perihelion and 2.017 AU at aphelion, a radial span of 1.068 AU.

Applying Kepler's third law to a = 1.483 AU gives an orbital period of 1.81 yr, or about 660 days.

An eccentricity of 0.36 makes the orbit moderately elongated.

The orbital plane is tilted 11.03° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.7 km/s at perihelion and falls to 16.8 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 = 27.2 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

The current orbit solution is based on 28 observations and has a weighted RMS residual of 0.4474 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
1.483 AU
Eccentricity
0.3602
Perihelion
0.949 AU
Aphelion
2.017177 AU
Inclination
11.03°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
64.98°

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-May-29 22:38 0.433841 AU
64901702 km
6.86 km/s
2029-Oct-26 20:06 0.069246 AU
10359126 km
13.88 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
27.2

Orbit Quality

RMS
0.44738
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.

Keep exploring

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