SpaceAtlas Space Object Data
NASA JPL SBDB · 2026 RW39

2026 RW39

2026 RW39 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.578 AU it takes 1.98 yr to circle the Sun.

Apollo Observations: 59
Orbital Period · P
1.98 yr
v(q)
34.7 km/s
v(Q)
16.2 km/s
Diameter · ≈
0.04 km
TJ
4.24
Eccentricity · e
0.3643

Orbit and dynamics

The path is an ellipse reaching 1.003 AU from the Sun at perihelion and 2.153 AU at aphelion, a radial span of 1.15 AU.

Applying Kepler's third law to a = 1.578 AU gives an orbital period of 1.98 yr, or about 724 days.

An eccentricity of 0.364 makes the orbit moderately elongated.

A steep inclination of 22.84° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 34.7 km/s at perihelion and falls to 16.2 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 24.66 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

The current orbit solution is based on 59 observations and has a weighted RMS residual of 0.4544 arcseconds.

Condition code U = 7 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
1.578 AU
Eccentricity
0.3643
Perihelion
1.003 AU
Aphelion
2.152865 AU
Inclination
22.84°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
320.91°

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-08 02:26 0.056267 AU
8417443 km
13.42 km/s
2030-Aug-31 08:23 0.165027 AU
24687624 km
13.51 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
24.66

Orbit Quality

RMS
0.45442
Condition
7
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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