SpaceAtlas Space Object Data
NASA JPL SBDB · 2018 HB1

2018 HB1

2018 HB1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.526 AU it takes 1.89 yr to circle the Sun.

Apollo Observations: 46
Orbital Period · P
1.89 yr
v(q)
35.5 km/s
v(Q)
16.4 km/s
Diameter · ≈
0.04 km
TJ
4.41
Eccentricity · e
0.3689

Orbit and dynamics

Between its closest point (0.963 AU) and its farthest (2.089 AU), the heliocentric distance changes by 1.126 AU over every revolution.

One full revolution takes 1.89 yr (689 days), computed from the semi-major axis of 1.526 AU.

An eccentricity of 0.369 makes the orbit moderately elongated.

The orbital plane is tilted 8.08° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.5 km/s at perihelion and falls to 16.4 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 = 24.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

Astrometry from 46 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5639 arcseconds.

Condition code U = 8 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
1.526 AU
Eccentricity
0.3689
Perihelion
0.963 AU
Aphelion
2.088941 AU
Inclination
8.08°
Orbital Period
— yr
Epoch
2458231.5
Mean Anomaly
337.97°

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
24.9

Orbit Quality

RMS
0.56393
Condition
8
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.

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