SpaceAtlas Space Object Data
NASA JPL SBDB · 2011 HN5

2011 HN5

2011 HN5 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.918 AU and a period of 0.88 yr.

Aten Observations: 50
Orbital Period · P
0.88 yr
v(q)
39.9 km/s
v(Q)
24.2 km/s
Diameter · ≈
0.03 km
TJ
6.48
Eccentricity · e
0.2442

Orbit and dynamics

Between its closest point (0.694 AU) and its farthest (1.142 AU), the heliocentric distance changes by 0.448 AU over every revolution.

One full revolution takes 0.88 yr (321 days), computed from the semi-major axis of 0.918 AU.

An eccentricity of 0.244 makes the orbit moderately elongated.

Its inclination of 3.99° keeps it close to the plane of the ecliptic.

By the vis-viva equation its orbital speed rises to 39.9 km/s at perihelion and falls to 24.2 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 = 25.1 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.03 km.

Observation record and orbit quality

Astrometry from 50 individual observations underpins this orbit; the fit leaves an RMS residual of 0.7777 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
0.9182 AU
Eccentricity
0.2442
Perihelion
0.694 AU
Aphelion
1.142424 AU
Inclination
3.99°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
203.02°

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
2033-Apr-23 13:34 0.101879 AU
15240843 km
5.19 km/s
2040-Mar-31 04:52 0.114117 AU
17071641 km
9.69 km/s
2041-Jul-17 11:54 0.147812 AU
22112298 km
10.34 km/s
2048-Jul-01 07:00 0.102228 AU
15293123 km
4.96 km/s
2055-May-06 03:54 0.119051 AU
17809825 km
5.35 km/s
2062-Mar-31 11:40 0.042643 AU
6379309 km
7.04 km/s
2070-Jul-19 09:06 0.077603 AU
11609172 km
7.40 km/s
2077-Jun-27 23:03 0.105912 AU
15844194 km
4.96 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
25.1

Orbit Quality

RMS
0.77769
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.

Keep exploring

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