SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 RW1

2018 RW1

2018 RW1 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.916 AU and a period of 0.88 yr.

Aten Observations: 82
Orbital Period · P
0.88 yr
v(q)
41.4 km/s
v(Q)
23.4 km/s
Diameter · ≈
0.07 km
TJ
6.48
Eccentricity · e
0.2779

Orbit and dynamics

Between its closest point (0.661 AU) and its farthest (1.17 AU), the heliocentric distance changes by 0.509 AU over every revolution.

One full revolution takes 0.88 yr (320 days), computed from the semi-major axis of 0.916 AU.

An eccentricity of 0.278 makes the orbit moderately elongated.

The orbital plane is tilted 8.15° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 41.4 km/s at perihelion and falls to 23.4 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 = 23.41 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.07 km.

Observation record and orbit quality

Astrometry from 82 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4139 arcseconds.

Condition code U = 1 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
0.9159 AU
Eccentricity
0.2779
Perihelion
0.661 AU
Aphelion
1.170429 AU
Inclination
8.15°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
139.08°

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-Aug-21 07:39 0.158111 AU
23653002 km
7.09 km/s
2039-Aug-07 09:57 0.144229 AU
21576343 km
6.89 km/s
2046-Jul-22 02:49 0.121464 AU
18170765 km
6.96 km/s
2053-Jul-13 18:34 0.115035 AU
17208920 km
8.13 km/s
2054-Oct-22 14:33 0.177403 AU
26539173 km
11.72 km/s
2060-Jul-11 19:14 0.134837 AU
20171305 km
9.69 km/s
2061-Oct-23 02:06 0.136097 AU
20359822 km
9.85 km/s
2067-Jul-13 00:31 0.176541 AU
26410189 km
11.58 km/s
2068-Oct-21 00:48 0.112815 AU
16876881 km
8.06 km/s
2075-Oct-11 19:00 0.122371 AU
18306452 km
6.90 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
23.41

Orbit Quality

RMS
0.41387
Condition
1
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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