SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 XS2

2018 XS2

2018 XS2 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.463 AU it takes 1.77 yr to circle the Sun.

Apollo Observations: 26
Orbital Period · P
1.77 yr
v(q)
34 km/s
v(Q)
17.8 km/s
Diameter · ≈
0.02 km
TJ
4.55
Eccentricity · e
0.3117

Orbit and dynamics

Between its closest point (1.007 AU) and its farthest (1.919 AU), the heliocentric distance changes by 0.912 AU over every revolution.

One full revolution takes 1.77 yr (646 days), computed from the semi-major axis of 1.463 AU.

An eccentricity of 0.312 makes the orbit moderately elongated.

The orbital plane is tilted 8.5° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34 km/s at perihelion and falls to 17.8 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 26.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 26 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3677 arcseconds.

Condition code U = 8 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
1.463 AU
Eccentricity
0.3117
Perihelion
1.007 AU
Aphelion
1.919017 AU
Inclination
8.5°
Orbital Period
— yr
Epoch
2458463.5
Mean Anomaly
14.31°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
26.1

Orbit Quality

RMS
0.36766
Condition
8
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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.

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