SpaceAtlas Space Object Data
NASA JPL SBDB · 2005 SD71

2005 SD71

2005 SD71 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.543 AU once every 1.92 yr.

Amor Observations: 68
Orbital Period · P
1.92 yr
v(q)
32.8 km/s
v(Q)
17.5 km/s
Diameter · ≈
0.08 km
TJ
4.41
Eccentricity · e
0.3026

Orbit and dynamics

Between its closest point (1.076 AU) and its farthest (2.01 AU), the heliocentric distance changes by 0.934 AU over every revolution.

One full revolution takes 1.92 yr (700 days), computed from the semi-major axis of 1.543 AU.

An eccentricity of 0.303 makes the orbit moderately elongated.

The orbital plane is tilted 5.17° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.8 km/s at perihelion and falls to 17.5 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 = 23.2 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

Astrometry from 68 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5705 arcseconds.

Condition code U = 6 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
1.543 AU
Eccentricity
0.3026
Perihelion
1.076 AU
Aphelion
2.009912 AU
Inclination
5.17°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
270.23°

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
2028-Oct-30 16:03 0.078642 AU
11764716 km
4.33 km/s
2030-Sep-23 07:58 0.439985 AU
65820801 km
15.45 km/s
2031-Jan-08 21:19 0.423787 AU
63397619 km
4.15 km/s
2051-Nov-10 04:47 0.113777 AU
17020868 km
7.94 km/s
2053-Oct-04 20:51 0.197428 AU
29534833 km
10.45 km/s
2074-Nov-19 15:23 0.288519 AU
43161793 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
23.2

Orbit Quality

RMS
0.57048
Condition
6
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.