SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 XJ1

2015 XJ1

2015 XJ1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.32 AU it takes 1.52 yr to circle the Sun.

Apollo Observations: 81
Orbital Period · P
1.52 yr
v(q)
37.6 km/s
v(Q)
17.9 km/s
Diameter · ≈
0.07 km
TJ
4.88
Eccentricity · e
0.3546

Orbit and dynamics

The path is an ellipse reaching 0.852 AU from the Sun at perihelion and 1.788 AU at aphelion, a radial span of 0.936 AU.

Applying Kepler's third law to a = 1.32 AU gives an orbital period of 1.52 yr, or about 554 days.

An eccentricity of 0.355 makes the orbit moderately elongated.

The orbital plane is tilted 6.5° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 37.6 km/s at perihelion and falls to 17.9 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 = 23.49 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.07 km.

Observation record and orbit quality

The current orbit solution is based on 81 observations and has a weighted RMS residual of 0.3199 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
1.32 AU
Eccentricity
0.3546
Perihelion
0.852 AU
Aphelion
1.788072 AU
Inclination
6.5°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
15.76°

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
2050-Jun-22 15:27 0.272766 AU
40805207 km
18.63 km/s
2053-Jul-02 07:09 0.114968 AU
17198901 km
13.14 km/s
2057-Jan-07 09:21 0.449364 AU
67223903 km
7.48 km/s
2062-Jun-05 12:32 0.373528 AU
55878947 km
6.85 km/s
2065-Nov-26 00:02 0.019264 AU
2881789 km
11.22 km/s
2068-Dec-08 12:10 0.213410 AU
31925645 km
17.34 km/s
2071-Dec-19 17:44 0.464398 AU
69472989 km
23.66 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
23.49

Orbit Quality

RMS
0.31986
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

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