SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 EW16

2011 EW16

2011 EW16 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.571 AU it takes 1.97 yr to circle the Sun.

Apollo Observations: 40
Orbital Period · P
1.97 yr
v(q)
35.3 km/s
v(Q)
16 km/s
Diameter · ≈
0.09 km
TJ
4.27
Eccentricity · e
0.3761

Orbit and dynamics

The path is an ellipse reaching 0.98 AU from the Sun at perihelion and 2.162 AU at aphelion, a radial span of 1.182 AU.

Applying Kepler's third law to a = 1.571 AU gives an orbital period of 1.97 yr, or about 719 days.

An eccentricity of 0.376 makes the orbit moderately elongated.

The orbital plane is tilted 19.26° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.3 km/s at perihelion and falls to 16 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 = 22.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.09 km.

Observation record and orbit quality

The current orbit solution is based on 40 observations and has a weighted RMS residual of 0.3599 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
1.571 AU
Eccentricity
0.3761
Perihelion
0.98 AU
Aphelion
2.161853 AU
Inclination
19.26°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
231.12°

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
2070-Aug-07 14:04 0.425094 AU
63593115 km
19.47 km/s
2072-Mar-12 23:36 0.427167 AU
63903310 km
9.98 km/s
2072-Aug-01 21:06 0.301268 AU
45069038 km
15.00 km/s
2074-Mar-23 02:17 0.272864 AU
40819881 km
10.29 km/s
2074-Jul-31 11:32 0.267984 AU
40089835 km
11.47 km/s
2076-Mar-22 20:58 0.173953 AU
26022957 km
12.53 km/s
2076-Aug-05 09:05 0.342607 AU
51253232 km
9.98 km/s
2078-Mar-18 20:02 0.242483 AU
36274950 km
16.34 km/s
2078-Aug-16 01:48 0.458360 AU
68569608 km
10.18 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
22.9

Orbit Quality

RMS
0.3599
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.

Keep exploring

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