SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 HB1

2017 HB1

2017 HB1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.305 AU it takes 1.49 yr to circle the Sun.

Apollo Observations: 86
Orbital Period · P
1.49 yr
v(q)
35 km/s
v(Q)
19.4 km/s
Diameter · ≈
0.02 km
TJ
4.95
Eccentricity · e
0.285

Orbit and dynamics

The path is an ellipse reaching 0.933 AU from the Sun at perihelion and 1.677 AU at aphelion, a radial span of 0.744 AU.

Applying Kepler's third law to a = 1.305 AU gives an orbital period of 1.49 yr, or about 545 days.

An eccentricity of 0.285 makes the orbit moderately elongated.

Its inclination of 3.87° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 35 km/s at perihelion and falls to 19.4 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 = 26.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

The current orbit solution is based on 86 observations and has a weighted RMS residual of 0.3672 arcseconds.

Condition code U = 2 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
1.305 AU
Eccentricity
0.285
Perihelion
0.933 AU
Aphelion
1.676925 AU
Inclination
3.87°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
14.88°

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
26.3

Orbit Quality

RMS
0.36719
Condition
2
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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