SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 BB4

2015 BB4

2015 BB4 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.363 AU once every 1.59 yr.

Amor Observations: 25
Orbital Period · P
1.59 yr
v(q)
30 km/s
v(Q)
21.7 km/s
Diameter · ≈
0.06 km
TJ
4.83
Eccentricity · e
0.1612

Orbit and dynamics

Between its closest point (1.144 AU) and its farthest (1.583 AU), the heliocentric distance changes by 0.439 AU over every revolution.

One full revolution takes 1.59 yr (581 days), computed from the semi-major axis of 1.363 AU.

An eccentricity of 0.161 makes the orbit moderately elongated.

Its inclination of 1.73° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 30 km/s at perihelion and falls to 21.7 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 23.82 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

Astrometry from 25 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5532 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
1.363 AU
Eccentricity
0.1612
Perihelion
1.144 AU
Aphelion
1.582716 AU
Inclination
1.73°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
38.82°

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
2031-May-08 17:57 0.313956 AU
46967197 km
3.59 km/s
2033-Nov-12 12:02 0.372457 AU
55718824 km
4.97 km/s
2039-Jun-04 02:13 0.397834 AU
59515073 km
5.19 km/s
2041-Dec-11 03:20 0.267144 AU
39964243 km
3.15 km/s
2047-Jun-25 00:32 0.463423 AU
69327165 km
6.29 km/s
2060-Oct-09 23:15 0.472558 AU
70693734 km
6.71 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
23.82

Orbit Quality

RMS
0.55316
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.