SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 WJ2

2017 WJ2

2017 WJ2 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.934 AU and a period of 0.90 yr.

Aten Observations: 40
Orbital Period · P
0.90 yr
v(q)
36.2 km/s
v(Q)
26.2 km/s
Diameter · ≈
0.12 km
TJ
6.34
Eccentricity · e
0.1613

Orbit and dynamics

Between its closest point (0.784 AU) and its farthest (1.085 AU), the heliocentric distance changes by 0.301 AU over every revolution.

One full revolution takes 0.90 yr (330 days), computed from the semi-major axis of 0.934 AU.

An eccentricity of 0.161 makes the orbit moderately elongated.

A steep inclination of 22° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 36.2 km/s at perihelion and falls to 26.2 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 = 22.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.12 km.

Observation record and orbit quality

Astrometry from 40 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5289 arcseconds.

Condition code U = 0 means the orbit is very well determined, leaving only a small uncertainty in the future ephemeris.

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
0.9345 AU
Eccentricity
0.1613
Perihelion
0.784 AU
Aphelion
1.085235 AU
Inclination
22.0°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
317.71°

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
2026-Nov-05 01:14 0.037739 AU
5645614 km
11.96 km/s
2045-Nov-08 18:52 0.160084 AU
23948254 km
11.30 km/s
2046-Apr-28 17:32 0.186916 AU
27962235 km
13.56 km/s
2054-Nov-04 22:07 0.049216 AU
7362630 km
12.31 km/s
2073-Nov-06 06:28 0.090935 AU
13603645 km
11.36 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
22.4

Orbit Quality

RMS
0.5289
Condition
0
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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