SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 BN1

2018 BN1

2018 BN1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.406 AU it takes 1.67 yr to circle the Sun.

Apollo Observations: 31
Orbital Period · P
1.67 yr
v(q)
39.1 km/s
v(Q)
16.1 km/s
Diameter · ≈
0.06 km
TJ
4.64
Eccentricity · e
0.4164

Orbit and dynamics

Between its closest point (0.821 AU) and its farthest (1.991 AU), the heliocentric distance changes by 1.17 AU over every revolution.

One full revolution takes 1.67 yr (609 days), computed from the semi-major axis of 1.406 AU.

The high eccentricity (0.416) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.47° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 39.1 km/s at perihelion and falls to 16.1 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 = 23.86 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.06 km.

Observation record and orbit quality

Astrometry from 31 individual observations underpins this orbit; the fit leaves an RMS residual of 0.2888 arcseconds.

Condition code U = 1 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
1.406 AU
Eccentricity
0.4164
Perihelion
0.821 AU
Aphelion
1.991458 AU
Inclination
5.47°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
51.8°

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-Dec-27 14:30 0.095584 AU
14299145 km
9.40 km/s
2032-Dec-28 22:50 0.088546 AU
13246353 km
9.90 km/s
2037-Dec-31 01:34 0.084390 AU
12624581 km
10.43 km/s
2043-Jan-01 19:52 0.083539 AU
12497241 km
10.92 km/s
2048-Jan-04 07:05 0.089087 AU
13327175 km
11.76 km/s
2053-Jan-06 07:08 0.109018 AU
16308824 km
12.95 km/s
2058-Jan-10 01:32 0.152760 AU
22852538 km
14.69 km/s
2063-Jan-14 04:04 0.215089 AU
32176842 km
16.81 km/s
2068-Jan-18 09:44 0.287774 AU
43050358 km
19.13 km/s
2073-Jan-21 19:56 0.368351 AU
55104579 km
21.64 km/s
2078-Jan-26 01:34 0.447625 AU
66963822 km
24.08 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
23.86

Orbit Quality

RMS
0.28883
Condition
1
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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