SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 KP18

2015 KP18

2015 KP18 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.649 AU it takes 2.12 yr to circle the Sun.

Apollo Observations: 99
Orbital Period · P
2.12 yr
v(q)
45.4 km/s
v(Q)
11.8 km/s
Diameter · ≈
0.09 km
TJ
4.07
Eccentricity · e
0.5864

Orbit and dynamics

Between its closest point (0.682 AU) and its farthest (2.616 AU), the heliocentric distance changes by 1.934 AU over every revolution.

One full revolution takes 2.12 yr (773 days), computed from the semi-major axis of 1.649 AU.

The high eccentricity (0.586) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 1.03° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 45.4 km/s at perihelion and falls to 11.8 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 = 23.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.09 km.

Observation record and orbit quality

Astrometry from 99 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5614 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
1.649 AU
Eccentricity
0.5864
Perihelion
0.682 AU
Aphelion
2.615974 AU
Inclination
1.03°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
43.12°

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
2032-May-26 06:38 0.229355 AU
34311063 km
23.71 km/s
2034-Aug-19 09:44 0.321914 AU
48157578 km
15.54 km/s
2036-Nov-26 12:58 0.044150 AU
6604683 km
18.29 km/s
2049-May-13 17:08 0.494980 AU
74047993 km
31.60 km/s
2051-Jul-08 19:16 0.227092 AU
33972545 km
11.99 km/s
2053-Nov-03 09:38 0.191098 AU
28587843 km
11.92 km/s
2068-Jun-07 14:47 0.013397 AU
2004092 km
17.37 km/s
2070-Sep-13 00:20 0.323428 AU
48384182 km
15.74 km/s
2072-Dec-04 19:30 0.185184 AU
27703119 km
22.59 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
23.1

Orbit Quality

RMS
0.56141
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.

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