SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 AN37

2011 AN37

2011 AN37 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.152 AU it takes 1.24 yr to circle the Sun.

Apollo Observations: 14
Orbital Period · P
1.24 yr
v(q)
35.2 km/s
v(Q)
21.9 km/s
Diameter · ≈
0.02 km
TJ
5.43
Eccentricity · e
0.2345

Orbit and dynamics

The path is an ellipse reaching 0.882 AU from the Sun at perihelion and 1.422 AU at aphelion, a radial span of 0.54 AU.

Applying Kepler's third law to a = 1.152 AU gives an orbital period of 1.24 yr, or about 452 days.

An eccentricity of 0.234 makes the orbit moderately elongated.

Its inclination of 4.2° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 35.2 km/s at perihelion and falls to 21.9 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 = 26.1 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 14 observations and has a weighted RMS residual of 0.316 arcseconds.

Condition code U = 8 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
1.152 AU
Eccentricity
0.2345
Perihelion
0.882 AU
Aphelion
1.422144 AU
Inclination
4.2°
Orbital Period
— yr
Epoch
2455576.5
Mean Anomaly
54.6°

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
2046-Jul-28 04:34 0.104299 AU
15602913 km
14.24 km/s
2052-Apr-26 13:31 0.416699 AU
62337333 km
7.77 km/s
2053-Jan-24 18:17 0.357588 AU
53494392 km
21.00 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
26.1

Orbit Quality

RMS
0.31597
Condition
8
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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