SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 EY11

2011 EY11

2011 EY11 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.331 AU it takes 1.54 yr to circle the Sun.

Apollo Observations: 49
Orbital Period · P
1.54 yr
v(q)
38.2 km/s
v(Q)
17.4 km/s
Diameter · ≈
0.01 km
TJ
4.83
Eccentricity · e
0.373

Orbit and dynamics

Between its closest point (0.834 AU) and its farthest (1.827 AU), the heliocentric distance changes by 0.993 AU over every revolution.

One full revolution takes 1.54 yr (561 days), computed from the semi-major axis of 1.331 AU.

An eccentricity of 0.373 makes the orbit moderately elongated.

The orbital plane is tilted 10.42° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.2 km/s at perihelion and falls to 17.4 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 = 28.5 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 49 individual observations underpins this orbit; the fit leaves an RMS residual of 0.2996 arcseconds.

Condition code U = 6 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
1.331 AU
Eccentricity
0.373
Perihelion
0.834 AU
Aphelion
1.827463 AU
Inclination
10.42°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
307.18°

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
2031-Feb-18 16:12 0.193795 AU
28991323 km
19.74 km/s
2034-Sep-03 04:30 0.411654 AU
61582585 km
8.57 km/s
2037-Jul-28 10:15 0.118992 AU
17800991 km
9.22 km/s
2040-Aug-17 20:33 0.257051 AU
38454252 km
21.42 km/s
2060-Aug-06 19:00 0.118351 AU
17705064 km
14.34 km/s
2074-Feb-16 04:40 0.321028 AU
48025042 km
21.26 km/s
2077-Mar-18 09:25 0.102571 AU
15344441 km
9.13 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
28.5

Orbit Quality

RMS
0.29956
Condition
6
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

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