SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 XW2

2018 XW2

2018 XW2 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.997 AU and a period of 1.00 yr.

Aten Observations: 42
Orbital Period · P
1.00 yr
v(q)
40.7 km/s
v(Q)
21.8 km/s
Diameter · ≈
0.03 km
TJ
6.01
Eccentricity · e
0.3019

Orbit and dynamics

Between its closest point (0.696 AU) and its farthest (1.298 AU), the heliocentric distance changes by 0.602 AU over every revolution.

One full revolution takes 1.00 yr (363 days), computed from the semi-major axis of 0.997 AU.

An eccentricity of 0.302 makes the orbit moderately elongated.

The orbital plane is tilted 19.74° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 40.7 km/s at perihelion and falls to 21.8 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 = 25.45 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 42 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3797 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
0.9968 AU
Eccentricity
0.3019
Perihelion
0.696 AU
Aphelion
1.297734 AU
Inclination
19.74°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
265.15°

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
25.45

Orbit Quality

RMS
0.37969
Condition
7
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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