SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 WC2

2018 WC2

2018 WC2 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.846 AU and a period of 0.78 yr.

Aten Observations: 41
Orbital Period · P
0.78 yr
v(q)
45.9 km/s
v(Q)
22.8 km/s
Diameter · ≈
0.03 km
TJ
6.91
Eccentricity · e
0.3356

Orbit and dynamics

Between its closest point (0.562 AU) and its farthest (1.13 AU), the heliocentric distance changes by 0.568 AU over every revolution.

One full revolution takes 0.78 yr (284 days), computed from the semi-major axis of 0.846 AU.

An eccentricity of 0.336 makes the orbit moderately elongated.

The orbital plane is tilted 7.22° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 45.9 km/s at perihelion and falls to 22.8 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 = 25.13 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 41 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5087 arcseconds.

Condition code U = 2 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
0.846 AU
Eccentricity
0.3356
Perihelion
0.562 AU
Aphelion
1.129918 AU
Inclination
7.22°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
129.37°

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-Nov-30 09:29 0.059385 AU
8883814 km
8.08 km/s
2039-Nov-24 10:29 0.097382 AU
14568194 km
7.56 km/s
2046-Nov-12 10:36 0.134184 AU
20073591 km
7.50 km/s
2053-Oct-28 11:48 0.158314 AU
23683419 km
7.57 km/s
2060-Oct-12 01:26 0.163333 AU
24434316 km
7.43 km/s
2067-Sep-24 11:02 0.148115 AU
22157697 km
7.24 km/s
2071-Dec-02 13:03 0.198576 AU
29706584 km
15.54 km/s
2074-Sep-11 04:46 0.126866 AU
18978858 km
8.42 km/s
2078-Dec-04 14:39 0.115675 AU
17304661 km
12.96 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
25.13

Orbit Quality

RMS
0.50866
Condition
2
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.

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