SpaceAtlas Space Object Data
NASA JPL SBDB · 2009 HG

2009 HG

2009 HG is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.365 AU once every 1.59 yr.

Amor Observations: 101
Orbital Period · P
1.59 yr
v(q)
32 km/s
v(Q)
20.3 km/s
Diameter · ≈
0.05 km
TJ
4.81
Eccentricity · e
0.2226

Orbit and dynamics

Between its closest point (1.061 AU) and its farthest (1.669 AU), the heliocentric distance changes by 0.608 AU over every revolution.

One full revolution takes 1.59 yr (582 days), computed from the semi-major axis of 1.365 AU.

An eccentricity of 0.223 makes the orbit moderately elongated.

Its inclination of 3.64° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 32 km/s at perihelion and falls to 20.3 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 24.34 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 101 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3027 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
1.365 AU
Eccentricity
0.2226
Perihelion
1.061 AU
Aphelion
1.668849 AU
Inclination
3.64°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
250.41°

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
2076-May-25 00:44 0.095101 AU
14226858 km
4.40 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
24.34

Orbit Quality

RMS
0.30268
Condition
0
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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