SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 RB8

2018 RB8

2018 RB8 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.64 AU once every 2.10 yr.

Amor Observations: 75
Orbital Period · P
2.10 yr
v(q)
32.6 km/s
v(Q)
16.6 km/s
Diameter · ≈
0.16 km
TJ
4.2
Eccentricity · e
0.3246

Orbit and dynamics

Between its closest point (1.108 AU) and its farthest (2.172 AU), the heliocentric distance changes by 1.064 AU over every revolution.

One full revolution takes 2.10 yr (767 days), computed from the semi-major axis of 1.64 AU.

An eccentricity of 0.325 makes the orbit moderately elongated.

The orbital plane is tilted 15.53° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.6 km/s at perihelion and falls to 16.6 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 = 21.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.16 km.

Observation record and orbit quality

Astrometry from 75 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5211 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
1.64 AU
Eccentricity
0.3246
Perihelion
1.108 AU
Aphelion
2.172344 AU
Inclination
15.53°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
213.26°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
21.7

Orbit Quality

RMS
0.52105
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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