SpaceAtlas Space Object Data
NASA JPL SBDB · 2021 NT5

2021 NT5

2021 NT5 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.293 AU it takes 1.47 yr to circle the Sun.

Apollo Observations: 25
Orbital Period · P
1.47 yr
v(q)
34.3 km/s
v(Q)
20 km/s
Diameter · ≈
0.01 km
TJ
4.98
Eccentricity · e
0.2647

Orbit and dynamics

The path is an ellipse reaching 0.951 AU from the Sun at perihelion and 1.635 AU at aphelion, a radial span of 0.684 AU.

Applying Kepler's third law to a = 1.293 AU gives an orbital period of 1.47 yr, or about 537 days.

An eccentricity of 0.265 makes the orbit moderately elongated.

The orbital plane is tilted 7.3° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.3 km/s at perihelion and falls to 20 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 = 27.12 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.01 km.

Observation record and orbit quality

The current orbit solution is based on 25 observations and has a weighted RMS residual of 0.2895 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
1.293 AU
Eccentricity
0.2647
Perihelion
0.951 AU
Aphelion
1.635257 AU
Inclination
7.3°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
90.54°

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-Oct-30 15:46 0.128709 AU
19254640 km
9.74 km/s
2049-Jun-24 01:44 0.236411 AU
35366636 km
14.57 km/s
2049-Dec-26 10:38 0.417666 AU
62481968 km
7.71 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
27.12

Orbit Quality

RMS
0.28951
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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