SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 WW27

2017 WW27

2017 WW27 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.21 AU it takes 1.33 yr to circle the Sun.

Apollo Observations: 44
Orbital Period · P
1.33 yr
v(q)
33.8 km/s
v(Q)
21.7 km/s
Diameter · ≈
0.06 km
TJ
5.12
Eccentricity · e
0.2186

Orbit and dynamics

The path is an ellipse reaching 0.945 AU from the Sun at perihelion and 1.475 AU at aphelion, a radial span of 0.53 AU.

Applying Kepler's third law to a = 1.21 AU gives an orbital period of 1.33 yr, or about 486 days.

An eccentricity of 0.219 makes the orbit moderately elongated.

A steep inclination of 29.88° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 33.8 km/s at perihelion and falls to 21.7 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 = 23.93 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

The current orbit solution is based on 44 observations and has a weighted RMS residual of 0.6033 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
1.21 AU
Eccentricity
0.2186
Perihelion
0.945 AU
Aphelion
1.474506 AU
Inclination
29.88°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
95.55°

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
2029-Nov-25 13:48 0.096609 AU
14452554 km
16.65 km/s
2033-Nov-24 14:30 0.122571 AU
18336364 km
17.26 km/s
2037-Nov-23 07:24 0.168235 AU
25167533 km
18.09 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
23.93

Orbit Quality

RMS
0.60328
Condition
0
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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