SpaceAtlas Space Object Data
NASA JPL SBDB · 2001 ND13

2001 ND13

2001 ND13 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.507 AU it takes 1.85 yr to circle the Sun.

Apollo Observations: 40
Orbital Period · P
1.85 yr
v(q)
38.7 km/s
v(Q)
15.2 km/s
Diameter · ≈
0.17 km
TJ
4.41
Eccentricity · e
0.4354

Orbit and dynamics

Between its closest point (0.851 AU) and its farthest (2.163 AU), the heliocentric distance changes by 1.312 AU over every revolution.

One full revolution takes 1.85 yr (676 days), computed from the semi-major axis of 1.507 AU.

The high eccentricity (0.435) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 8.43° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.7 km/s at perihelion and falls to 15.2 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 = 21.66 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.17 km.

Observation record and orbit quality

Astrometry from 40 individual observations underpins this orbit; the fit leaves an RMS residual of 0.344 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
1.507 AU
Eccentricity
0.4354
Perihelion
0.851 AU
Aphelion
2.163148 AU
Inclination
8.43°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
130.96°

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
2038-Aug-16 22:30 0.109219 AU
16338863 km
10.09 km/s
2062-Oct-22 20:02 0.150800 AU
22559426 km
9.83 km/s
2075-Aug-19 07:03 0.111755 AU
16718350 km
10.02 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
21.66

Orbit Quality

RMS
0.34404
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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