SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 XQ55

2015 XQ55

2015 XQ55 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.849 AU and a period of 0.78 yr.

Aten Observations: 173
Orbital Period · P
0.78 yr
v(q)
61.8 km/s
v(Q)
16.9 km/s
Diameter · ≈
0.16 km
TJ
6.79
Eccentricity · e
0.5699

Orbit and dynamics

The path is an ellipse reaching 0.365 AU from the Sun at perihelion and 1.332 AU at aphelion, a radial span of 0.967 AU.

Applying Kepler's third law to a = 0.849 AU gives an orbital period of 0.78 yr, or about 285 days.

The high eccentricity (0.57) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 9.57° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 61.8 km/s at perihelion and falls to 16.9 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 = 21.78 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.16 km.

Observation record and orbit quality

The current orbit solution is based on 173 observations and has a weighted RMS residual of 0.5299 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
0.8485 AU
Eccentricity
0.5699
Perihelion
0.365 AU
Aphelion
1.33206 AU
Inclination
9.57°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
16.87°

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
2027-Jan-09 09:32 0.148343 AU
22191839 km
18.83 km/s
2032-Oct-22 22:19 0.132009 AU
19748287 km
20.60 km/s
2034-Jan-07 16:39 0.188374 AU
28180356 km
13.82 km/s
2043-Oct-27 05:04 0.197437 AU
29536203 km
13.44 km/s
2050-Oct-21 07:16 0.076115 AU
11386711 km
17.18 km/s
2052-Jan-10 20:36 0.138758 AU
20757921 km
16.42 km/s
2068-Oct-22 07:52 0.138884 AU
20776784 km
14.38 km/s
2070-Jan-08 09:52 0.168628 AU
25226388 km
20.11 km/s
2075-Oct-22 23:32 0.103859 AU
15537042 km
19.47 km/s
2077-Jan-09 05:13 0.168552 AU
25215051 km
14.44 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
21.78

Orbit Quality

RMS
0.52991
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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