SpaceAtlas Space Object Data
NASA JPL SBDB · 2013 NP8

2013 NP8

2013 NP8 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.873 AU once every 2.56 yr.

Amor Observations: 65
Orbital Period · P
2.56 yr
v(q)
34.8 km/s
v(Q)
13.6 km/s
Diameter · ≈
0.16 km
TJ
3.85
Eccentricity · e
0.4386

Orbit and dynamics

Between its closest point (1.051 AU) and its farthest (2.694 AU), the heliocentric distance changes by 1.643 AU over every revolution.

One full revolution takes 2.56 yr (936 days), computed from the semi-major axis of 1.873 AU.

The high eccentricity (0.439) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 8.05° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 34.8 km/s at perihelion and falls to 13.6 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 = 21.7 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.16 km.

Observation record and orbit quality

Astrometry from 65 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3484 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
1.873 AU
Eccentricity
0.4386
Perihelion
1.051 AU
Aphelion
2.694498 AU
Inclination
8.05°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
358.87°

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
2031-Jun-29 17:00 0.445257 AU
66609565 km
18.72 km/s
2036-Oct-05 00:21 0.320999 AU
48020761 km
13.79 km/s
2054-Aug-01 12:38 0.128528 AU
19227558 km
6.51 km/s
2072-Jul-03 19:23 0.366755 AU
54865763 km
16.42 km/s
2077-Oct-10 16:41 0.392077 AU
58653874 km
16.18 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
21.7

Orbit Quality

RMS
0.34836
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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