SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 KG1

2018 KG1

2018 KG1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.643 AU it takes 4.30 yr to circle the Sun.

Apollo Observations: 153
Orbital Period · P
4.30 yr
v(q)
37.6 km/s
v(Q)
8.9 km/s
Diameter · ≈
0.51 km
TJ
3.09
Eccentricity · e
0.6169

Orbit and dynamics

Between its closest point (1.013 AU) and its farthest (4.273 AU), the heliocentric distance changes by 3.26 AU over every revolution.

One full revolution takes 4.30 yr (1,569 days), computed from the semi-major axis of 2.643 AU.

The high eccentricity (0.617) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.1° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 37.6 km/s at perihelion and falls to 8.9 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 19.21 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.51 km.

Observation record and orbit quality

Astrometry from 153 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4971 arcseconds.

Condition code U = 3 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
2.643 AU
Eccentricity
0.6169
Perihelion
1.013 AU
Aphelion
4.273467 AU
Inclination
5.1°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
287.61°

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
2031-Jul-08 14:49 0.152901 AU
22873720 km
12.94 km/s
2061-Jun-23 18:00 0.283057 AU
42344796 km
18.26 km/s
2078-Oct-15 02:50 0.376468 AU
56318753 km
20.45 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
19.21

Orbit Quality

RMS
0.49713
Condition
3
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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