SpaceAtlas Space Object Data
NASA JPL SBDB · 2004 RZ164

2004 RZ164

2004 RZ164 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.562 AU it takes 4.10 yr to circle the Sun.

Apollo Observations: 797
Orbital Period · P
4.10 yr
v(q)
37.6 km/s
v(Q)
9.2 km/s
Diameter · ≈
0.56 km
TJ
3.11
Eccentricity · e
0.6071

Orbit and dynamics

Between its closest point (1.007 AU) and its farthest (4.117 AU), the heliocentric distance changes by 3.11 AU over every revolution.

One full revolution takes 4.10 yr (1,498 days), computed from the semi-major axis of 2.562 AU.

The high eccentricity (0.607) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 13.85° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 37.6 km/s at perihelion and falls to 9.2 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 19 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.56 km.

Observation record and orbit quality

Astrometry from 797 individual observations underpins this orbit; the fit leaves an RMS residual of 0.298 arcseconds.

Condition code U = 0 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
2.562 AU
Eccentricity
0.6071
Perihelion
1.007 AU
Aphelion
4.11739 AU
Inclination
13.85°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
92.1°

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
2041-Oct-25 14:53 0.274406 AU
41050564 km
14.19 km/s
2046-Jan-10 10:47 0.498398 AU
74559226 km
22.45 km/s
2074-Nov-30 09:06 0.056709 AU
8483604 km
10.63 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
19.0

Orbit Quality

RMS
0.29802
Condition
0
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.