SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 ET74

2011 ET74

2011 ET74 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.154 AU it takes 1.24 yr to circle the Sun.

Apollo Observations: 20
Orbital Period · P
1.24 yr
v(q)
34.5 km/s
v(Q)
22.3 km/s
Diameter · ≈
0.02 km
TJ
5.43
Eccentricity · e
0.215

Orbit and dynamics

Between its closest point (0.906 AU) and its farthest (1.402 AU), the heliocentric distance changes by 0.496 AU over every revolution.

One full revolution takes 1.24 yr (453 days), computed from the semi-major axis of 1.154 AU.

An eccentricity of 0.215 makes the orbit moderately elongated.

Its inclination of 2.97° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 34.5 km/s at perihelion and falls to 22.3 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 = 26.2 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 20 individual observations underpins this orbit; the fit leaves an RMS residual of 0.8734 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
1.154 AU
Eccentricity
0.215
Perihelion
0.906 AU
Aphelion
1.40211 AU
Inclination
2.97°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
152.06°

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-Jul-12 21:24 0.380161 AU
56871325 km
7.02 km/s
2036-Aug-06 17:47 0.326340 AU
48819742 km
6.43 km/s
2037-Mar-20 19:18 0.167984 AU
25130094 km
13.01 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
26.2

Orbit Quality

RMS
0.87345
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.

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