SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 YK

2015 YK

2015 YK belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.095 AU it takes 1.15 yr to circle the Sun.

Apollo Observations: 96
Orbital Period · P
1.15 yr
v(q)
32.1 km/s
v(Q)
25.2 km/s
Diameter · ≈
0.02 km
TJ
5.66
Eccentricity · e
0.1193

Orbit and dynamics

The path is an ellipse reaching 0.965 AU from the Sun at perihelion and 1.226 AU at aphelion, a radial span of 0.261 AU.

Applying Kepler's third law to a = 1.095 AU gives an orbital period of 1.15 yr, or about 419 days.

An eccentricity of 0.119 makes the orbit moderately elongated.

Its inclination of 4.7° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 32.1 km/s at perihelion and falls to 25.2 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

The measured diameter is 0.05 km, a value from direct size determination rather than from brightness alone.

Its geometric albedo of 0.037 indicates a very dark, carbonaceous-type surface.

Observation record and orbit quality

The current orbit solution is based on 96 observations and has a weighted RMS residual of 0.4273 arcseconds.

Condition code U = 5 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
1.095 AU
Eccentricity
0.1193
Perihelion
0.965 AU
Aphelion
1.225633 AU
Inclination
4.7°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
12.26°

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-Oct-05 09:13 0.190002 AU
28423885 km
3.32 km/s
2032-Apr-16 10:41 0.155373 AU
23243529 km
7.06 km/s
2038-Nov-26 21:07 0.467981 AU
70009027 km
17.06 km/s
2039-Aug-22 13:35 0.227846 AU
34085214 km
4.21 km/s
2040-Apr-25 19:49 0.345019 AU
51614182 km
12.94 km/s
2046-Dec-06 18:47 0.258337 AU
38646661 km
10.91 km/s
2047-Jul-15 03:48 0.206537 AU
30897448 km
4.24 km/s
2054-Dec-16 09:50 0.064800 AU
9694009 km
5.36 km/s
2055-Jun-05 11:06 0.142050 AU
21250306 km
3.46 km/s
2062-Dec-22 02:31 0.020423 AU
3055311 km
3.28 km/s
2063-May-11 18:41 0.103575 AU
15494612 km
2.82 km/s
2071-Apr-14 18:42 0.071577 AU
10707773 km
4.83 km/s
2079-Apr-24 16:16 0.194464 AU
29091384 km
11.74 km/s

Distances in astronomical units (AU) and kilometres. Source: NASA/JPL CNEOS Close Approach Data API.

Physical Parameters

Diameter
0.046 km
Albedo
0.037
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
25.86

Orbit Quality

RMS
0.42727
Condition
5
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.