SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 BL31

2017 BL31

2017 BL31 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.462 AU it takes 3.86 yr to circle the Sun.

Apollo Observations: 113
Orbital Period · P
3.86 yr
v(q)
67 km/s
v(Q)
5.4 km/s
Diameter · ≈
0.56 km
TJ
2.77
Eccentricity · e
0.8512

Orbit and dynamics

The path is an ellipse reaching 0.366 AU from the Sun at perihelion and 4.558 AU at aphelion, a radial span of 4.192 AU.

Applying Kepler's third law to a = 2.462 AU gives an orbital period of 3.86 yr, or about 1,411 days.

The high eccentricity (0.851) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 24.79° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 67 km/s at perihelion and falls to 5.4 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 = 19 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.56 km.

Observation record and orbit quality

The current orbit solution is based on 113 observations and has a weighted RMS residual of 0.5128 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
2.462 AU
Eccentricity
0.8512
Perihelion
0.366 AU
Aphelion
4.557654 AU
Inclination
24.79°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
124.18°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
19.0

Orbit Quality

RMS
0.51278
Condition
0
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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.