SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 KW1

2018 KW1

2018 KW1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.475 AU it takes 1.79 yr to circle the Sun.

Apollo Observations: 47
Orbital Period · P
1.79 yr
v(q)
34.6 km/s
v(Q)
17.4 km/s
Diameter · ≈
0 km
TJ
4.53
Eccentricity · e
0.331

Orbit and dynamics

The path is an ellipse reaching 0.987 AU from the Sun at perihelion and 1.963 AU at aphelion, a radial span of 0.976 AU.

Applying Kepler's third law to a = 1.475 AU gives an orbital period of 1.79 yr, or about 654 days.

An eccentricity of 0.331 makes the orbit moderately elongated.

The orbital plane is tilted 6.49° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.6 km/s at perihelion and falls to 17.4 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 = 29.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0 km.

Observation record and orbit quality

The current orbit solution is based on 47 observations and has a weighted RMS residual of 0.5713 arcseconds.

Condition code U = 6 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
1.475 AU
Eccentricity
0.331
Perihelion
0.987 AU
Aphelion
1.963225 AU
Inclination
6.49°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
163.66°

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
2027-Apr-27 14:49 0.210500 AU
31490298 km
13.53 km/s
2027-Sep-16 09:59 0.442184 AU
66149793 km
4.95 km/s
2043-Aug-21 03:33 0.284565 AU
42570380 km
15.93 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
29.7

Orbit Quality

RMS
0.57128
Condition
6
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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