SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 XZ9

2013 XZ9

2013 XZ9 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.526 AU it takes 1.89 yr to circle the Sun.

Apollo Observations: 59
Orbital Period · P
1.89 yr
v(q)
36.6 km/s
v(Q)
15.9 km/s
Diameter · ≈
0.11 km
TJ
4.34
Eccentricity · e
0.3943

Orbit and dynamics

Between its closest point (0.924 AU) and its farthest (2.128 AU), the heliocentric distance changes by 1.204 AU over every revolution.

One full revolution takes 1.89 yr (689 days), computed from the semi-major axis of 1.526 AU.

An eccentricity of 0.394 makes the orbit moderately elongated.

A steep inclination of 21.43° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 36.6 km/s at perihelion and falls to 15.9 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 = 22.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.11 km.

Observation record and orbit quality

Astrometry from 59 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5448 arcseconds.

Condition code U = 4 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
1.526 AU
Eccentricity
0.3943
Perihelion
0.924 AU
Aphelion
2.127702 AU
Inclination
21.43°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
247.83°

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
2030-Jul-30 20:48 0.406887 AU
60869356 km
9.28 km/s
2030-Nov-16 23:36 0.195277 AU
29213065 km
12.52 km/s
2045-Dec-16 10:21 0.255940 AU
38288067 km
19.63 km/s
2047-Aug-07 00:40 0.401168 AU
60013836 km
13.59 km/s
2062-Jul-17 19:29 0.470910 AU
70447150 km
10.16 km/s
2062-Nov-30 22:54 0.027070 AU
4049626 km
14.07 km/s
2077-Dec-18 13:11 0.296989 AU
44428892 km
20.55 km/s
2079-Aug-08 15:38 0.397253 AU
59428274 km
12.97 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
22.5

Orbit Quality

RMS
0.54485
Condition
4
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.