SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 EW74

2011 EW74

2011 EW74 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.385 AU it takes 1.63 yr to circle the Sun.

Apollo Observations: 136
Orbital Period · P
1.63 yr
v(q)
33.6 km/s
v(Q)
19.1 km/s
Diameter · ≈
0.08 km
TJ
4.73
Eccentricity · e
0.2758

Orbit and dynamics

The path is an ellipse reaching 1.003 AU from the Sun at perihelion and 1.767 AU at aphelion, a radial span of 0.764 AU.

Applying Kepler's third law to a = 1.385 AU gives an orbital period of 1.63 yr, or about 595 days.

An eccentricity of 0.276 makes the orbit moderately elongated.

The orbital plane is tilted 12.55° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.6 km/s at perihelion and falls to 19.1 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 23.29 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

The current orbit solution is based on 136 observations and has a weighted RMS residual of 0.2913 arcseconds.

Condition code U = 7 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
1.385 AU
Eccentricity
0.2758
Perihelion
1.003 AU
Aphelion
1.766983 AU
Inclination
12.55°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
136.24°

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-Jan-15 22:15 0.393802 AU
58911929 km
17.20 km/s
2037-Apr-20 13:13 0.283956 AU
42479222 km
17.12 km/s
2068-Mar-24 23:28 0.025975 AU
3885837 km
8.46 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
23.29

Orbit Quality

RMS
0.2913
Condition
7
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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