SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 SM5

2011 SM5

2011 SM5 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.937 AU and a period of 0.91 yr.

Aten Observations: 33
Orbital Period · P
0.91 yr
v(q)
45.2 km/s
v(Q)
21 km/s
Diameter · ≈
0.08 km
TJ
6.27
Eccentricity · e
0.3655

Orbit and dynamics

Between its closest point (0.594 AU) and its farthest (1.279 AU), the heliocentric distance changes by 0.685 AU over every revolution.

One full revolution takes 0.91 yr (331 days), computed from the semi-major axis of 0.937 AU.

An eccentricity of 0.365 makes the orbit moderately elongated.

A steep inclination of 25.02° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 45.2 km/s at perihelion and falls to 21 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 = 23.17 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

Astrometry from 33 individual observations underpins this orbit; the fit leaves an RMS residual of 0.6795 arcseconds.

Condition code U = 2 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
0.9367 AU
Eccentricity
0.3655
Perihelion
0.594 AU
Aphelion
1.279064 AU
Inclination
25.02°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
260.35°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
23.17

Orbit Quality

RMS
0.6795
Condition
2
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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