SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 EP2

2009 EP2

2009 EP2 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.927 AU and a period of 0.89 yr.

Aten Observations: 192
Orbital Period · P
0.89 yr
v(q)
44.9 km/s
v(Q)
21.3 km/s
Diameter · ≈
0.17 km
TJ
6.31
Eccentricity · e
0.3563

Orbit and dynamics

The path is an ellipse reaching 0.597 AU from the Sun at perihelion and 1.257 AU at aphelion, a radial span of 0.66 AU.

Applying Kepler's third law to a = 0.927 AU gives an orbital period of 0.89 yr, or about 326 days.

An eccentricity of 0.356 makes the orbit moderately elongated.

A steep inclination of 27.7° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 44.9 km/s at perihelion and falls to 21.3 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 = 21.61 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.17 km.

Observation record and orbit quality

The current orbit solution is based on 192 observations and has a weighted RMS residual of 0.4369 arcseconds.

Condition code U = 0 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
0.927 AU
Eccentricity
0.3563
Perihelion
0.597 AU
Aphelion
1.25729 AU
Inclination
27.7°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
18.08°

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
2034-Mar-18 09:57 0.060025 AU
8979633 km
17.93 km/s
2042-Mar-19 04:21 0.135410 AU
20257112 km
15.17 km/s
2059-Mar-17 01:36 0.129427 AU
19361933 km
19.64 km/s
2067-Mar-19 19:33 0.065881 AU
9855612 km
16.22 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
21.61

Orbit Quality

RMS
0.43689
Condition
0
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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