SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 HN24

2011 HN24

2011 HN24 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.374 AU it takes 1.61 yr to circle the Sun.

Apollo Observations: 28
Orbital Period · P
1.61 yr
v(q)
35.1 km/s
v(Q)
18.4 km/s
Diameter · ≈
0.01 km
TJ
4.76
Eccentricity · e
0.3114

Orbit and dynamics

Between its closest point (0.946 AU) and its farthest (1.802 AU), the heliocentric distance changes by 0.856 AU over every revolution.

One full revolution takes 1.61 yr (588 days), computed from the semi-major axis of 1.374 AU.

An eccentricity of 0.311 makes the orbit moderately elongated.

Its inclination of 1.1° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 35.1 km/s at perihelion and falls to 18.4 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 = 27.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

Astrometry from 28 individual observations underpins this orbit; the fit leaves an RMS residual of 0.988 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
1.374 AU
Eccentricity
0.3114
Perihelion
0.946 AU
Aphelion
1.801864 AU
Inclination
1.1°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
165.86°

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
2047-Dec-09 14:41 0.390573 AU
58428892 km
5.32 km/s
2048-May-10 18:36 0.159784 AU
23903332 km
11.63 km/s
2077-May-14 14:18 0.094113 AU
14079079 km
13.23 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
27.7

Orbit Quality

RMS
0.98796
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.

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