SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 KW31

2017 KW31

2017 KW31 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.393 AU it takes 1.64 yr to circle the Sun.

Apollo Observations: 97
Orbital Period · P
1.64 yr
v(q)
38.2 km/s
v(Q)
16.7 km/s
Diameter · ≈
0.02 km
TJ
4.68
Eccentricity · e
0.3921

Orbit and dynamics

Between its closest point (0.847 AU) and its farthest (1.939 AU), the heliocentric distance changes by 1.092 AU over every revolution.

One full revolution takes 1.64 yr (601 days), computed from the semi-major axis of 1.393 AU.

An eccentricity of 0.392 makes the orbit moderately elongated.

The orbital plane is tilted 5.91° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.2 km/s at perihelion and falls to 16.7 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 = 26.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 97 individual observations underpins this orbit; the fit leaves an RMS residual of 0.442 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
1.393 AU
Eccentricity
0.3921
Perihelion
0.847 AU
Aphelion
1.939195 AU
Inclination
5.91°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
145.47°

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
2030-Nov-02 15:48 0.336856 AU
50393007 km
21.28 km/s
2035-Oct-07 17:41 0.080738 AU
12078171 km
8.92 km/s
2040-Nov-16 05:28 0.445063 AU
66580485 km
7.40 km/s
2045-May-13 18:11 0.210634 AU
31510447 km
18.65 km/s
2053-Nov-08 03:09 0.418707 AU
62637650 km
24.83 km/s
2058-Oct-17 06:23 0.078701 AU
11773545 km
11.93 km/s
2068-May-18 10:20 0.105585 AU
15795237 km
16.10 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
26.5

Orbit Quality

RMS
0.44203
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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.