SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 RZ3

2018 RZ3

2018 RZ3 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.406 AU once every 1.67 yr.

Amor Observations: 63
Orbital Period · P
1.67 yr
v(q)
32.6 km/s
v(Q)
19.4 km/s
Diameter · ≈
0.06 km
TJ
4.59
Eccentricity · e
0.2539

Orbit and dynamics

The path is an ellipse reaching 1.049 AU from the Sun at perihelion and 1.763 AU at aphelion, a radial span of 0.714 AU.

Applying Kepler's third law to a = 1.406 AU gives an orbital period of 1.67 yr, or about 609 days.

An eccentricity of 0.254 makes the orbit moderately elongated.

A steep inclination of 28.33° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 32.6 km/s at perihelion and falls to 19.4 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 23.93 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

The current orbit solution is based on 63 observations and has a weighted RMS residual of 0.4453 arcseconds.

Condition code U = 2 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
1.406 AU
Eccentricity
0.2539
Perihelion
1.049 AU
Aphelion
1.762983 AU
Inclination
28.33°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
217.77°

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
2028-Sep-09 09:17 0.088261 AU
13203696 km
15.22 km/s
2033-Sep-10 18:52 0.114432 AU
17118844 km
15.19 km/s
2038-Sep-12 13:09 0.154154 AU
23061183 km
15.23 km/s
2043-Sep-14 14:15 0.205694 AU
30771311 km
15.42 km/s
2048-Sep-15 19:13 0.265475 AU
39714547 km
15.80 km/s
2053-Sep-18 03:03 0.332200 AU
49696440 km
16.39 km/s
2058-Sep-20 10:45 0.402577 AU
60224589 km
17.18 km/s
2063-Sep-22 17:56 0.477064 AU
71367693 km
18.17 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
23.93

Orbit Quality

RMS
0.44528
Condition
2
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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