SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 YO4

2017 YO4

2017 YO4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.226 AU it takes 3.32 yr to circle the Sun.

Apollo Observations: 46
Orbital Period · P
3.32 yr
v(q)
66.3 km/s
v(Q)
6 km/s
Diameter · ≈
0.27 km
TJ
3.05
Eccentricity · e
0.8338

Orbit and dynamics

Between its closest point (0.37 AU) and its farthest (4.082 AU), the heliocentric distance changes by 3.712 AU over every revolution.

One full revolution takes 3.32 yr (1,213 days), computed from the semi-major axis of 2.226 AU.

The high eccentricity (0.834) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 7.35° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 66.3 km/s at perihelion and falls to 6 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 = 20.6 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.27 km.

Observation record and orbit quality

Astrometry from 46 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4184 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
2.226 AU
Eccentricity
0.8338
Perihelion
0.37 AU
Aphelion
4.082039 AU
Inclination
7.35°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
166.55°

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-Aug-29 13:05 0.102310 AU
15305383 km
32.12 km/s
2041-Aug-25 10:37 0.081975 AU
12263223 km
30.01 km/s
2051-Aug-22 20:18 0.080527 AU
12046665 km
27.79 km/s
2058-Jan-17 16:36 0.141462 AU
21162477 km
21.96 km/s
2061-Aug-19 20:50 0.079513 AU
11894910 km
26.66 km/s
2071-Aug-30 22:08 0.080024 AU
11971418 km
33.02 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
20.6

Orbit Quality

RMS
0.41844
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.