SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 SO32

2011 SO32

2011 SO32 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.725 AU it takes 2.27 yr to circle the Sun.

Apollo Observations: 275
Orbital Period · P
2.27 yr
v(q)
38.1 km/s
v(Q)
13.5 km/s
Diameter · ≈
0.21 km
TJ
4.01
Eccentricity · e
0.4769

Orbit and dynamics

The path is an ellipse reaching 0.902 AU from the Sun at perihelion and 2.548 AU at aphelion, a radial span of 1.646 AU.

Applying Kepler's third law to a = 1.725 AU gives an orbital period of 2.27 yr, or about 828 days.

The high eccentricity (0.477) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 9.91° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.1 km/s at perihelion and falls to 13.5 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 = 21.19 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.21 km.

Observation record and orbit quality

The current orbit solution is based on 275 observations and has a weighted RMS residual of 0.5543 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
1.725 AU
Eccentricity
0.4769
Perihelion
0.902 AU
Aphelion
2.547653 AU
Inclination
9.91°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
148.93°

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-Feb-21 12:41 0.341270 AU
51053337 km
19.10 km/s
2045-Oct-09 18:35 0.237981 AU
35601396 km
17.51 km/s
2054-Nov-17 22:05 0.132736 AU
19857016 km
8.46 km/s
2064-Feb-13 21:47 0.220188 AU
32939724 km
14.63 km/s
2079-Oct-04 02:20 0.355046 AU
53114163 km
20.86 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
21.19

Orbit Quality

RMS
0.55434
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.

Keep exploring

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