SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 GW9

2011 GW9

2011 GW9 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.315 AU it takes 1.51 yr to circle the Sun.

Apollo Observations: 33
Orbital Period · P
1.51 yr
v(q)
38.5 km/s
v(Q)
17.5 km/s
Diameter · ≈
0.01 km
TJ
4.88
Eccentricity · e
0.3753

Orbit and dynamics

Between its closest point (0.822 AU) and its farthest (1.809 AU), the heliocentric distance changes by 0.987 AU over every revolution.

One full revolution takes 1.51 yr (551 days), computed from the semi-major axis of 1.315 AU.

An eccentricity of 0.375 makes the orbit moderately elongated.

The orbital plane is tilted 7.23° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.5 km/s at perihelion and falls to 17.5 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 = 28.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 33 individual observations underpins this orbit; the fit leaves an RMS residual of 0.6327 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
1.315 AU
Eccentricity
0.3753
Perihelion
0.822 AU
Aphelion
1.808519 AU
Inclination
7.23°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
349.8°

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
2035-Sep-06 01:21 0.075955 AU
11362658 km
12.24 km/s
2038-Sep-11 08:43 0.074454 AU
11138229 km
15.21 km/s
2041-Sep-16 03:40 0.094734 AU
14172033 km
18.23 km/s
2044-Sep-20 23:41 0.171041 AU
25587320 km
21.43 km/s
2047-Sep-26 18:52 0.265035 AU
39648655 km
24.67 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
28.1

Orbit Quality

RMS
0.63271
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.

Keep exploring

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