SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 XB128

2015 XB128

2015 XB128 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.82 AU and a period of 0.74 yr.

Aten Observations: 25
Orbital Period · P
0.74 yr
v(q)
41.9 km/s
v(Q)
25.8 km/s
Diameter · ≈
0.03 km
TJ
7.09
Eccentricity · e
0.2367

Orbit and dynamics

Between its closest point (0.626 AU) and its farthest (1.014 AU), the heliocentric distance changes by 0.388 AU over every revolution.

One full revolution takes 0.74 yr (271 days), computed from the semi-major axis of 0.82 AU.

An eccentricity of 0.237 makes the orbit moderately elongated.

The orbital plane is tilted 15.59° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 41.9 km/s at perihelion and falls to 25.8 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 = 25.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 25 individual observations underpins this orbit; the fit leaves an RMS residual of 0.9218 arcseconds.

Condition code U = 7 signals a poorly constrained orbit, so its future path should be treated as provisional.

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
0.8203 AU
Eccentricity
0.2367
Perihelion
0.626 AU
Aphelion
1.014465 AU
Inclination
15.59°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
215.13°

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-Jul-03 18:25 0.403865 AU
60417338 km
14.64 km/s
2030-Jun-13 20:00 0.392752 AU
58754835 km
15.53 km/s
2033-May-25 10:11 0.378695 AU
56651954 km
15.38 km/s
2035-Nov-24 10:47 0.271593 AU
40629685 km
17.75 km/s
2038-Nov-21 13:35 0.102855 AU
15386933 km
12.97 km/s
2041-Nov-24 01:55 0.018292 AU
2736517 km
9.51 km/s
2044-Dec-04 10:20 0.060690 AU
9079062 km
8.72 km/s
2047-Dec-20 03:32 0.169868 AU
25411882 km
10.40 km/s
2050-Aug-02 12:18 0.396316 AU
59288097 km
11.34 km/s
2050-Dec-27 08:04 0.309003 AU
46226191 km
14.26 km/s
2053-Jul-11 21:20 0.404216 AU
60469847 km
13.92 km/s
2053-Dec-26 11:14 0.472190 AU
70638620 km
19.14 km/s
2056-Jun-22 11:58 0.399580 AU
59776371 km
15.23 km/s
2059-Jun-04 17:55 0.386798 AU
57864171 km
15.55 km/s
2061-Nov-26 13:29 0.367047 AU
54909383 km
20.50 km/s
2062-May-17 00:16 0.372068 AU
55660605 km
15.01 km/s
2064-Nov-22 08:52 0.184413 AU
27587788 km
15.73 km/s
2067-Nov-21 23:16 0.034662 AU
5185289 km
11.56 km/s
2070-Nov-26 13:13 0.014683 AU
2196538 km
9.03 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
25.4

Orbit Quality

RMS
0.92181
Condition
7
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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