SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 KP57

2015 KP57

2015 KP57 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.963 AU and a period of 0.95 yr.

Aten Observations: 18
Orbital Period · P
0.95 yr
v(q)
50.8 km/s
v(Q)
18.1 km/s
Diameter · ≈
0.04 km
TJ
6.16
Eccentricity · e
0.4742

Orbit and dynamics

The path is an ellipse reaching 0.506 AU from the Sun at perihelion and 1.42 AU at aphelion, a radial span of 0.914 AU.

Applying Kepler's third law to a = 0.963 AU gives an orbital period of 0.95 yr, or about 345 days.

The high eccentricity (0.474) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 1.8° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 50.8 km/s at perihelion and falls to 18.1 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 = 24.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

The current orbit solution is based on 18 observations and has a weighted RMS residual of 1.0082 arcseconds.

Condition code U = 8 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
0.9632 AU
Eccentricity
0.4742
Perihelion
0.506 AU
Aphelion
1.419949 AU
Inclination
1.8°
Orbital Period
— yr
Epoch
2457165.5
Mean Anomaly
286.14°

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-Jan-31 14:05 0.029923 AU
4476439 km
13.73 km/s
2032-May-24 11:51 0.005404 AU
808449 km
17.86 km/s
2033-May-10 20:36 0.222476 AU
33281989 km
28.29 km/s
2042-Feb-20 16:42 0.319019 AU
47724622 km
30.13 km/s
2043-Feb-06 08:40 0.025907 AU
3875669 km
19.18 km/s
2048-May-29 02:09 0.005896 AU
882006 km
13.21 km/s
2049-May-17 16:55 0.209622 AU
31358997 km
23.36 km/s
2059-Feb-14 18:54 0.160181 AU
23962716 km
25.69 km/s
2060-Feb-01 21:13 0.029971 AU
4483637 km
14.90 km/s
2077-Jan-30 15:19 0.025274 AU
3780948 km
11.75 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
24.9

Orbit Quality

RMS
1.0082
Condition
8
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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