SpaceAtlas Space Object Data
NASA JPL SBDB · 2019 WC4

2019 WC4

2019 WC4 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.93 AU and a period of 0.90 yr.

Aten Observations: 42
Orbital Period · P
0.90 yr
v(q)
52.6 km/s
v(Q)
18.1 km/s
Diameter · ≈
0.12 km
TJ
6.32
Eccentricity · e
0.4877

Orbit and dynamics

The path is an ellipse reaching 0.477 AU from the Sun at perihelion and 1.384 AU at aphelion, a radial span of 0.907 AU.

Applying Kepler's third law to a = 0.93 AU gives an orbital period of 0.90 yr, or about 328 days.

The high eccentricity (0.488) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 9.83° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 52.6 km/s at perihelion and falls to 18.1 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

The current orbit solution is based on 42 observations and has a weighted RMS residual of 0.4815 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
0.9303 AU
Eccentricity
0.4877
Perihelion
0.477 AU
Aphelion
1.384007 AU
Inclination
9.83°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
3.97°

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
2028-Dec-13 17:41 0.092807 AU
13883688 km
14.52 km/s
2037-Dec-08 14:59 0.143264 AU
21432006 km
19.02 km/s
2043-Aug-24 05:16 0.142027 AU
21246882 km
18.21 km/s
2052-Aug-18 07:14 0.117868 AU
17632874 km
14.16 km/s
2063-Dec-15 21:01 0.119039 AU
17807939 km
13.16 km/s
2072-Dec-10 12:20 0.106038 AU
15863127 km
17.46 km/s
2078-Aug-26 01:04 0.176067 AU
26339270 km
19.59 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
0.48148
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.

Keep exploring

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