SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 BL1

2018 BL1

2018 BL1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 2.243 AU it takes 3.36 yr to circle the Sun.

Apollo Observations: 57
Orbital Period · P
3.36 yr
v(q)
47.4 km/s
v(Q)
8.3 km/s
Diameter · ≈
0.08 km
TJ
3.25
Eccentricity · e
0.7003

Orbit and dynamics

Between its closest point (0.672 AU) and its farthest (3.814 AU), the heliocentric distance changes by 3.142 AU over every revolution.

One full revolution takes 3.36 yr (1,227 days), computed from the semi-major axis of 2.243 AU.

The high eccentricity (0.7) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 6.19° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 47.4 km/s at perihelion and falls to 8.3 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 = 23.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

Astrometry from 57 individual observations underpins this orbit; the fit leaves an RMS residual of 0.7279 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
2.243 AU
Eccentricity
0.7003
Perihelion
0.672 AU
Aphelion
3.813773 AU
Inclination
6.19°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
155.34°

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
2065-May-15 18:10 0.330398 AU
49426788 km
17.28 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
23.3

Orbit Quality

RMS
0.7279
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.

Keep exploring

Explore asteroids, comets and near-Earth objects with JPL orbital data.