SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 BO311

2015 BO311

2015 BO311 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.93 AU once every 2.68 yr.

Amor Observations: 43
Orbital Period · P
2.68 yr
v(q)
31.7 km/s
v(Q)
14.5 km/s
Diameter · ≈
0.12 km
TJ
3.82
Eccentricity · e
0.3709

Orbit and dynamics

The path is an ellipse reaching 1.214 AU from the Sun at perihelion and 2.646 AU at aphelion, a radial span of 1.432 AU.

Applying Kepler's third law to a = 1.93 AU gives an orbital period of 2.68 yr, or about 979 days.

An eccentricity of 0.371 makes the orbit moderately elongated.

Its inclination of 4.56° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 31.7 km/s at perihelion and falls to 14.5 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 = 22.38 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.12 km.

Observation record and orbit quality

The current orbit solution is based on 43 observations and has a weighted RMS residual of 0.4399 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
1.93 AU
Eccentricity
0.3709
Perihelion
1.214 AU
Aphelion
2.645837 AU
Inclination
4.56°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
63.82°

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
2058-Apr-30 17:11 0.420863 AU
62960176 km
1.59 km/s
2066-Apr-01 02:38 0.258055 AU
38604419 km
1.70 km/s
2074-Mar-08 14:11 0.288536 AU
43164423 km
1.54 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
22.38

Orbit Quality

RMS
0.43992
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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