SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 EW

2009 EW

2009 EW belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.257 AU it takes 1.41 yr to circle the Sun.

Apollo Observations: 53
Orbital Period · P
1.41 yr
v(q)
40.1 km/s
v(Q)
17.6 km/s
Diameter · ≈
0.02 km
TJ
5.03
Eccentricity · e
0.3892

Orbit and dynamics

The path is an ellipse reaching 0.768 AU from the Sun at perihelion and 1.746 AU at aphelion, a radial span of 0.978 AU.

Applying Kepler's third law to a = 1.257 AU gives an orbital period of 1.41 yr, or about 515 days.

An eccentricity of 0.389 makes the orbit moderately elongated.

The orbital plane is tilted 10.71° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 40.1 km/s at perihelion and falls to 17.6 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 = 26.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

The current orbit solution is based on 53 observations and has a weighted RMS residual of 0.3215 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
1.257 AU
Eccentricity
0.3892
Perihelion
0.768 AU
Aphelion
1.746224 AU
Inclination
10.71°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
47.76°

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
2030-Aug-24 23:41 0.058087 AU
8689634 km
13.71 km/s
2033-Feb-25 11:49 0.025591 AU
3828399 km
17.39 km/s
2037-Sep-08 13:08 0.225734 AU
33769400 km
22.92 km/s
2061-Sep-03 11:37 0.066450 AU
9940771 km
19.56 km/s
2071-Sep-20 08:40 0.419616 AU
62773677 km
8.80 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
26.4

Orbit Quality

RMS
0.32146
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.

Keep exploring

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