SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 CH71

2011 CH71

2011 CH71 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.645 AU it takes 4.30 yr to circle the Sun.

Apollo Observations: 405
Orbital Period · P
4.30 yr
v(q)
38.1 km/s
v(Q)
8.8 km/s
Diameter · ≈
0.69 km
TJ
2.99
Eccentricity · e
0.6243

Orbit and dynamics

The path is an ellipse reaching 0.994 AU from the Sun at perihelion and 4.296 AU at aphelion, a radial span of 3.302 AU.

Applying Kepler's third law to a = 2.645 AU gives an orbital period of 4.30 yr, or about 1,571 days.

The high eccentricity (0.624) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 23.35° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 38.1 km/s at perihelion and falls to 8.8 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 = 18.57 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.69 km.

Observation record and orbit quality

The current orbit solution is based on 405 observations and has a weighted RMS residual of 0.4354 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
2.645 AU
Eccentricity
0.6243
Perihelion
0.994 AU
Aphelion
4.296273 AU
Inclination
23.35°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
182.52°

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
2054-Mar-13 19:45 0.286923 AU
42923028 km
13.83 km/s
2054-Jun-22 21:23 0.421524 AU
63059047 km
10.55 km/s
2067-Feb-24 05:20 0.436261 AU
65263732 km
24.80 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
18.57

Orbit Quality

RMS
0.43541
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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