SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 TZ1

2018 TZ1

2018 TZ1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.098 AU it takes 1.15 yr to circle the Sun.

Apollo Observations: 33
Orbital Period · P
1.15 yr
v(q)
32.9 km/s
v(Q)
24.6 km/s
Diameter · ≈
0.04 km
TJ
5.64
Eccentricity · e
0.1442

Orbit and dynamics

The path is an ellipse reaching 0.94 AU from the Sun at perihelion and 1.256 AU at aphelion, a radial span of 0.316 AU.

Applying Kepler's third law to a = 1.098 AU gives an orbital period of 1.15 yr, or about 420 days.

An eccentricity of 0.144 makes the orbit moderately elongated.

The orbital plane is tilted 9.7° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.9 km/s at perihelion and falls to 24.6 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 = 25 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

The current orbit solution is based on 33 observations and has a weighted RMS residual of 0.5561 arcseconds.

Condition code U = 6 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
1.098 AU
Eccentricity
0.1442
Perihelion
0.94 AU
Aphelion
1.256332 AU
Inclination
9.7°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
308.3°

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
2033-Apr-19 15:53 0.071792 AU
10739956 km
7.12 km/s
2033-Nov-18 19:59 0.253314 AU
37895206 km
5.24 km/s
2041-Sep-26 18:52 0.037811 AU
5656517 km
6.33 km/s
2048-Apr-11 16:45 0.195671 AU
29272023 km
16.15 km/s
2049-Oct-05 08:23 0.055492 AU
8301438 km
13.01 km/s
2079-Apr-16 18:59 0.083227 AU
12450539 km
12.53 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
25.0

Orbit Quality

RMS
0.55613
Condition
6
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.