SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 XF55

2015 XF55

2015 XF55 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.04 AU it takes 1.06 yr to circle the Sun.

Apollo Observations: 23
Orbital Period · P
1.06 yr
v(q)
34.9 km/s
v(Q)
24.5 km/s
Diameter · ≈
0.04 km
TJ
5.87
Eccentricity · e
0.1743

Orbit and dynamics

Between its closest point (0.858 AU) and its farthest (1.221 AU), the heliocentric distance changes by 0.363 AU over every revolution.

One full revolution takes 1.06 yr (387 days), computed from the semi-major axis of 1.04 AU.

An eccentricity of 0.174 makes the orbit moderately elongated.

The orbital plane is tilted 9.94° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.9 km/s at perihelion and falls to 24.5 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 = 25 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

Astrometry from 23 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5306 arcseconds.

Condition code U = 6 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
1.04 AU
Eccentricity
0.1743
Perihelion
0.858 AU
Aphelion
1.221272 AU
Inclination
9.94°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
69.02°

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
2030-Apr-18 07:32 0.378607 AU
56638825 km
18.62 km/s
2031-May-12 02:30 0.071984 AU
10768716 km
8.74 km/s
2032-Dec-21 11:26 0.190650 AU
28520904 km
6.60 km/s
2033-Nov-13 15:54 0.093924 AU
14050856 km
9.51 km/s
2034-Nov-23 22:04 0.409580 AU
61272281 km
20.02 km/s
2048-Apr-22 22:22 0.256507 AU
38372864 km
15.90 km/s
2051-Nov-15 15:59 0.132957 AU
19890058 km
12.27 km/s
2066-Apr-29 18:33 0.102846 AU
15385482 km
12.84 km/s
2069-Nov-18 06:40 0.175326 AU
26228396 km
15.51 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
25.0

Orbit Quality

RMS
0.53062
Condition
6
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.