SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 QE23

2011 QE23

2011 QE23 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.441 AU it takes 1.73 yr to circle the Sun.

Apollo Observations: 44
Orbital Period · P
1.73 yr
v(q)
33.9 km/s
v(Q)
18.2 km/s
Diameter · ≈
0.02 km
TJ
4.61
Eccentricity · e
0.3011

Orbit and dynamics

The path is an ellipse reaching 1.007 AU from the Sun at perihelion and 1.875 AU at aphelion, a radial span of 0.868 AU.

Applying Kepler's third law to a = 1.441 AU gives an orbital period of 1.73 yr, or about 632 days.

An eccentricity of 0.301 makes the orbit moderately elongated.

Its inclination of 2.1° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 33.9 km/s at perihelion and falls to 18.2 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 25.8 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 44 observations and has a weighted RMS residual of 0.5434 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
1.441 AU
Eccentricity
0.3011
Perihelion
1.007 AU
Aphelion
1.874885 AU
Inclination
2.1°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
211.45°

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
2049-Sep-24 16:14 0.226605 AU
33899657 km
15.16 km/s
2068-Apr-21 23:02 0.486574 AU
72790481 km
6.00 km/s
2068-Sep-27 20:51 0.390440 AU
58408920 km
16.90 km/s
2075-Jun-25 14:27 0.040177 AU
6010387 km
6.67 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
25.8

Orbit Quality

RMS
0.54345
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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