SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 XB2

2009 XB2

2009 XB2 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.673 AU once every 2.16 yr.

Amor Observations: 118
Orbital Period · P
2.16 yr
v(q)
33 km/s
v(Q)
16.1 km/s
Diameter · ≈
0.29 km
TJ
4.15
Eccentricity · e
0.3446

Orbit and dynamics

The path is an ellipse reaching 1.097 AU from the Sun at perihelion and 2.25 AU at aphelion, a radial span of 1.153 AU.

Applying Kepler's third law to a = 1.673 AU gives an orbital period of 2.16 yr, or about 790 days.

An eccentricity of 0.345 makes the orbit moderately elongated.

The orbital plane is tilted 11.94° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33 km/s at perihelion and falls to 16.1 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 20.46 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.29 km.

Observation record and orbit quality

The current orbit solution is based on 118 observations and has a weighted RMS residual of 0.4867 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
1.673 AU
Eccentricity
0.3446
Perihelion
1.097 AU
Aphelion
2.249516 AU
Inclination
11.94°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
246.93°

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
2035-Dec-28 15:15 0.422188 AU
63158383 km
6.46 km/s
2049-Jan-04 11:44 0.479559 AU
71740935 km
6.77 km/s
2063-Aug-20 22:46 0.491804 AU
73572846 km
5.76 km/s
2076-Aug-27 16:00 0.450746 AU
67430630 km
4.78 km/s
2076-Dec-06 19:23 0.443427 AU
66335798 km
15.28 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
20.46

Orbit Quality

RMS
0.4867
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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