SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 SW20

2017 SW20

2017 SW20 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.014 AU it takes 2.86 yr to circle the Sun.

Apollo Observations: 82
Orbital Period · P
2.86 yr
v(q)
62.9 km/s
v(Q)
7 km/s
Diameter · ≈
0.47 km
TJ
3.28
Eccentricity · e
0.7998

Orbit and dynamics

The path is an ellipse reaching 0.403 AU from the Sun at perihelion and 3.625 AU at aphelion, a radial span of 3.222 AU.

Applying Kepler's third law to a = 2.014 AU gives an orbital period of 2.86 yr, or about 1,044 days.

The high eccentricity (0.8) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 20.25° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 62.9 km/s at perihelion and falls to 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 = 19.39 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.47 km.

Observation record and orbit quality

The current orbit solution is based on 82 observations and has a weighted RMS residual of 0.5743 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
2.014 AU
Eccentricity
0.7998
Perihelion
0.403 AU
Aphelion
3.624797 AU
Inclination
20.25°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
38.75°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
19.39

Orbit Quality

RMS
0.57429
Condition
1
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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