SpaceAtlas Space Object Data
NASA JPL SBDB · 2005 NB56

2005 NB56

2005 NB56 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.643 AU it takes 2.11 yr to circle the Sun.

Apollo Observations: 28
Orbital Period · P
2.11 yr
v(q)
38.8 km/s
v(Q)
13.9 km/s
Diameter · ≈
0.08 km
TJ
4.15
Eccentricity · e
0.4726

Orbit and dynamics

The path is an ellipse reaching 0.866 AU from the Sun at perihelion and 2.419 AU at aphelion, a radial span of 1.553 AU.

Applying Kepler's third law to a = 1.643 AU gives an orbital period of 2.11 yr, or about 769 days.

The high eccentricity (0.473) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 6.77° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.8 km/s at perihelion and falls to 13.9 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 = 23.33 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

The current orbit solution is based on 28 observations and has a weighted RMS residual of 0.7092 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
1.643 AU
Eccentricity
0.4726
Perihelion
0.866 AU
Aphelion
2.419482 AU
Inclination
6.77°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
0.2°

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
2043-Feb-27 10:28 0.204455 AU
30586003 km
16.81 km/s
2045-Jun-28 15:50 0.067016 AU
10025443 km
10.09 km/s
2064-Mar-13 16:54 0.104795 AU
15677103 km
10.83 km/s
2066-Jul-16 23:57 0.112377 AU
16811357 km
14.96 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
23.33

Orbit Quality

RMS
0.70919
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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