SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 XT168

2015 XT168

2015 XT168 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.939 AU and a period of 0.91 yr.

Aten Observations: 86
Orbital Period · P
0.91 yr
v(q)
40.8 km/s
v(Q)
23.2 km/s
Diameter · ≈
0.22 km
TJ
6.31
Eccentricity · e
0.2757

Orbit and dynamics

The path is an ellipse reaching 0.68 AU from the Sun at perihelion and 1.197 AU at aphelion, a radial span of 0.517 AU.

Applying Kepler's third law to a = 0.939 AU gives an orbital period of 0.91 yr, or about 332 days.

An eccentricity of 0.276 makes the orbit moderately elongated.

The orbital plane is tilted 19.74° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 40.8 km/s at perihelion and falls to 23.2 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 = 21.09 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.22 km.

Observation record and orbit quality

The current orbit solution is based on 86 observations and has a weighted RMS residual of 0.5283 arcseconds.

Condition code U = 1 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
0.9386 AU
Eccentricity
0.2757
Perihelion
0.68 AU
Aphelion
1.197372 AU
Inclination
19.74°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
302.14°

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
2076-Nov-23 16:43 0.190426 AU
28487335 km
10.90 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
21.09

Orbit Quality

RMS
0.52826
Condition
1
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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