SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 XJ1

2018 XJ1

2018 XJ1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.752 AU it takes 2.32 yr to circle the Sun.

Apollo Observations: 45
Orbital Period · P
2.32 yr
v(q)
35.7 km/s
v(Q)
14.2 km/s
Diameter · ≈
0.02 km
TJ
4.01
Eccentricity · e
0.4305

Orbit and dynamics

Between its closest point (0.998 AU) and its farthest (2.506 AU), the heliocentric distance changes by 1.508 AU over every revolution.

One full revolution takes 2.32 yr (847 days), computed from the semi-major axis of 1.752 AU.

The high eccentricity (0.43) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.49° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.7 km/s at perihelion and falls to 14.2 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 = 26.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 45 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3776 arcseconds.

Condition code U = 4 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
1.752 AU
Eccentricity
0.4305
Perihelion
0.998 AU
Aphelion
2.506236 AU
Inclination
5.49°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
80.29°

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
2032-Oct-19 08:59 0.448969 AU
67164742 km
19.37 km/s
2063-Feb-06 04:17 0.386510 AU
57821013 km
17.73 km/s
2070-Jan-16 16:12 0.125549 AU
18781834 km
9.62 km/s
2076-Dec-01 02:01 0.036236 AU
5420829 km
6.76 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
26.4

Orbit Quality

RMS
0.37757
Condition
4
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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