SpaceAtlas Space Object Data
NASA JPL SBDB · 2025 YN

2025 YN

2025 YN is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.63 AU and a period of 0.50 yr.

Aten Observations: 37
Orbital Period · P
0.50 yr
v(q)
79 km/s
v(Q)
17.8 km/s
Diameter · ≈
0.02 km
TJ
8.79
Eccentricity · e
0.6323

Orbit and dynamics

Between its closest point (0.232 AU) and its farthest (1.028 AU), the heliocentric distance changes by 0.796 AU over every revolution.

One full revolution takes 0.50 yr (183 days), computed from the semi-major axis of 0.63 AU.

The high eccentricity (0.632) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 10.2° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 79 km/s at perihelion and falls to 17.8 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 = 26.16 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.02 km.

Observation record and orbit quality

Astrometry from 37 individual observations underpins this orbit; the fit leaves an RMS residual of 0.3302 arcseconds.

Condition code U = 8 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
0.6298 AU
Eccentricity
0.6323
Perihelion
0.232 AU
Aphelion
1.028023 AU
Inclination
10.2°
Orbital Period
— yr
Epoch
2461028.5
Mean Anomaly
180.15°

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
2026-Dec-18 06:29 0.045056 AU
6740238 km
13.11 km/s
2027-Dec-18 16:50 0.044344 AU
6633812 km
13.11 km/s
2028-Dec-18 02:18 0.044063 AU
6591662 km
13.12 km/s
2029-Dec-18 12:34 0.044449 AU
6649442 km
13.10 km/s
2030-Dec-18 23:05 0.045018 AU
6734646 km
13.12 km/s
2031-Dec-19 09:12 0.045478 AU
6803469 km
13.12 km/s
2032-Dec-18 20:51 0.046052 AU
6889288 km
13.10 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
26.16

Orbit Quality

RMS
0.33023
Condition
8
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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