SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 CW1

2018 CW1

2018 CW1 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 2.037 AU once every 2.91 yr.

Amor Observations: 44
Orbital Period · P
2.91 yr
v(q)
30.6 km/s
v(Q)
14.2 km/s
Diameter · ≈
0.17 km
TJ
3.69
Eccentricity · e
0.3659

Orbit and dynamics

The path is an ellipse reaching 1.292 AU from the Sun at perihelion and 2.782 AU at aphelion, a radial span of 1.49 AU.

Applying Kepler's third law to a = 2.037 AU gives an orbital period of 2.91 yr, or about 1,062 days.

An eccentricity of 0.366 makes the orbit moderately elongated.

The orbital plane is tilted 13.1° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 30.6 km/s at perihelion and falls to 14.2 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 21.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.17 km.

Observation record and orbit quality

The current orbit solution is based on 44 observations and has a weighted RMS residual of 0.6588 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
2.037 AU
Eccentricity
0.3659
Perihelion
1.292 AU
Aphelion
2.782338 AU
Inclination
13.1°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
328.38°

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
2046-Nov-15 21:56 0.465914 AU
69699693 km
5.96 km/s
2050-Jan-06 03:49 0.421831 AU
63104946 km
0.34 km/s
2078-Nov-20 22:01 0.437308 AU
65420403 km
5.54 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
21.6

Orbit Quality

RMS
0.65878
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.

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