SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 TZ5

2018 TZ5

2018 TZ5 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.987 AU it takes 2.80 yr to circle the Sun.

Apollo Observations: 71
Orbital Period · P
2.80 yr
v(q)
39.3 km/s
v(Q)
11.4 km/s
Diameter · ≈
0.05 km
TJ
3.65
Eccentricity · e
0.5513

Orbit and dynamics

Between its closest point (0.891 AU) and its farthest (3.082 AU), the heliocentric distance changes by 2.191 AU over every revolution.

One full revolution takes 2.80 yr (1,023 days), computed from the semi-major axis of 1.987 AU.

The high eccentricity (0.551) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 1.17° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 39.3 km/s at perihelion and falls to 11.4 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 = 24.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 71 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5091 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
1.987 AU
Eccentricity
0.5513
Perihelion
0.891 AU
Aphelion
3.082433 AU
Inclination
1.17°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
276.86°

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
2046-Oct-31 12:57 0.133546 AU
19978203 km
20.55 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
24.4

Orbit Quality

RMS
0.50913
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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