Orbit and dynamics
Between its closest point (0.678 AU) and its farthest (1.11 AU), the heliocentric distance changes by 0.432 AU over every revolution.
One full revolution takes 0.85 yr (309 days), computed from the semi-major axis of 0.894 AU.
An eccentricity of 0.242 makes the orbit moderately elongated.
Its inclination of 0.7° keeps it close to the plane of the ecliptic.
By the vis-viva equation its orbital speed rises to 40.3 km/s at perihelion and falls to 24.6 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
Neither a measured diameter nor a reliable absolute magnitude is available for 2018 RW, so its physical size remains unconstrained.
Observation record and orbit quality
Astrometry from 48 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4079 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
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 distance | Velocity |
|---|---|---|
| 2029-Feb-24 02:43 | 0.282973 AU 42332106 km |
8.71 km/s |
| 2029-Sep-09 09:06 | 0.048602 AU 7270740 km |
7.51 km/s |
| 2034-Jun-06 00:00 | 0.021161 AU 3165652 km |
5.35 km/s |
| 2034-Dec-01 14:49 | 0.265251 AU 39680972 km |
7.66 km/s |
| 2039-Jun-10 14:11 | 0.297177 AU 44457120 km |
15.12 km/s |
| 2040-Jan-22 02:23 | 0.308414 AU 46138041 km |
10.13 km/s |
| 2040-Sep-01 09:45 | 0.277481 AU 41510544 km |
14.64 km/s |
| 2045-Mar-17 03:03 | 0.247895 AU 37084542 km |
6.93 km/s |
| 2045-Aug-29 18:04 | 0.032915 AU 4923996 km |
4.68 km/s |
| 2050-Jun-02 03:29 | 0.085605 AU 12806357 km |
9.02 km/s |
| 2050-Dec-24 16:58 | 0.290925 AU 43521739 km |
9.40 km/s |
| 2051-Aug-26 04:26 | 0.408209 AU 61067209 km |
19.75 km/s |
| 2056-Sep-04 23:13 | 0.001684 AU 251964 km |
5.30 km/s |
| 2061-Jun-04 14:48 | 0.017625 AU 2636718 km |
12.92 km/s |
Distances in astronomical units (AU) and kilometres. Source: NASA/JPL CNEOS Close Approach Data API.
Physical Parameters
Orbit Quality
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