SpaceAtlas Space Object Data
NASA JPL SBDB · 2012 XH55

2012 XH55

2012 XH55 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.972 AU it takes 2.77 yr to circle the Sun.

Apollo Observations: 135
Orbital Period · P
2.77 yr
v(q)
51.3 km/s
v(Q)
8.8 km/s
Diameter · ≈
0.56 km
TJ
3.4
Eccentricity · e
0.7077

Orbit and dynamics

Between its closest point (0.576 AU) and its farthest (3.368 AU), the heliocentric distance changes by 2.792 AU over every revolution.

One full revolution takes 2.77 yr (1,011 days), computed from the semi-major axis of 1.972 AU.

The high eccentricity (0.708) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 28.46° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 51.3 km/s at perihelion and falls to 8.8 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 = 19.02 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.56 km.

Observation record and orbit quality

Astrometry from 135 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4012 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
1.972 AU
Eccentricity
0.7077
Perihelion
0.576 AU
Aphelion
3.367584 AU
Inclination
28.46°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
284.35°

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

Predicted close approaches to Earth, from NASA's Center for Near-Earth Object Studies (CNEOS).

Date (UTC)Miss distanceVelocity
2035-Jun-23 09:25 0.244799 AU
36621431 km
19.90 km/s
2037-Dec-23 16:48 0.174531 AU
26109531 km
30.00 km/s
2046-Jul-09 02:35 0.133324 AU
19945008 km
28.45 km/s
2049-Jan-13 03:39 0.210595 AU
31504631 km
21.66 km/s
2057-Jul-25 01:25 0.472048 AU
70617323 km
37.99 km/s
2073-Dec-08 22:58 0.448129 AU
67039123 km
37.91 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
19.02

Orbit Quality

RMS
0.40125
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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