SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 EF17

2011 EF17

2011 EF17 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.342 AU it takes 3.58 yr to circle the Sun.

Apollo Observations: 96
Orbital Period · P
3.58 yr
v(q)
50.7 km/s
v(Q)
7.5 km/s
Diameter · ≈
0.51 km
TJ
3.12
Eccentricity · e
0.7434

Orbit and dynamics

Between its closest point (0.601 AU) and its farthest (4.083 AU), the heliocentric distance changes by 3.482 AU over every revolution.

One full revolution takes 3.58 yr (1,309 days), computed from the semi-major axis of 2.342 AU.

The high eccentricity (0.743) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

Its inclination of 4.22° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 50.7 km/s at perihelion and falls to 7.5 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 = 19.21 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.51 km.

Observation record and orbit quality

Astrometry from 96 individual observations underpins this orbit; the fit leaves an RMS residual of 0.7069 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
2.342 AU
Eccentricity
0.7434
Perihelion
0.601 AU
Aphelion
4.083043 AU
Inclination
4.22°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
51.25°

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
2072-Sep-24 08:14 0.167812 AU
25104376 km
17.47 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
19.21

Orbit Quality

RMS
0.70689
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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.