SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 RB1

2018 RB1

2018 RB1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.118 AU it takes 1.18 yr to circle the Sun.

Apollo Observations: 41
Orbital Period · P
1.18 yr
v(q)
37.6 km/s
v(Q)
21.1 km/s
Diameter · ≈
0.01 km
TJ
5.54
Eccentricity · e
0.2819

Orbit and dynamics

Between its closest point (0.803 AU) and its farthest (1.433 AU), the heliocentric distance changes by 0.63 AU over every revolution.

One full revolution takes 1.18 yr (432 days), computed from the semi-major axis of 1.118 AU.

An eccentricity of 0.282 makes the orbit moderately elongated.

The orbital plane is tilted 5.09° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 37.6 km/s at perihelion and falls to 21.1 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 = 27.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 41 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3465 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
1.118 AU
Eccentricity
0.2819
Perihelion
0.803 AU
Aphelion
1.433164 AU
Inclination
5.09°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
139.16°

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
2032-May-02 01:44 0.368453 AU
55119856 km
7.66 km/s
2037-Aug-20 10:21 0.302860 AU
45307149 km
20.00 km/s
2038-Jun-19 11:44 0.405280 AU
60629025 km
8.06 km/s
2039-Feb-28 03:20 0.016200 AU
2423559 km
9.56 km/s
2044-Aug-20 01:13 0.218822 AU
32735312 km
4.72 km/s
2044-Nov-08 03:05 0.174277 AU
26071504 km
6.89 km/s
2045-Apr-19 18:53 0.338065 AU
50573775 km
7.06 km/s
2050-Aug-29 06:08 0.173155 AU
25903617 km
15.10 km/s
2051-Jun-04 10:09 0.431276 AU
64518042 km
8.30 km/s
2052-Mar-08 18:36 0.140183 AU
20971005 km
15.05 km/s
2070-Jul-05 20:50 0.383826 AU
57419522 km
7.54 km/s
2071-Feb-07 23:32 0.112810 AU
16876069 km
5.16 km/s
2077-May-11 08:30 0.353802 AU
52928066 km
7.99 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
27.9

Orbit Quality

RMS
0.34648
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.

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