SpaceAtlas Space Object Data
NASA JPL SBDB · 2001 YU3

2001 YU3

2001 YU3 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.945 AU once every 2.71 yr.

Amor Observations: 499
Orbital Period · P
2.71 yr
v(q)
35.3 km/s
v(Q)
12.9 km/s
Diameter · ≈
0.37 km
TJ
3.75
Eccentricity · e
0.4634

Orbit and dynamics

The path is an ellipse reaching 1.044 AU from the Sun at perihelion and 2.846 AU at aphelion, a radial span of 1.802 AU.

Applying Kepler's third law to a = 1.945 AU gives an orbital period of 2.71 yr, or about 991 days.

The high eccentricity (0.463) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 8.54° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 35.3 km/s at perihelion and falls to 12.9 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 = 19.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.37 km.

Observation record and orbit quality

The current orbit solution is based on 499 observations and has a weighted RMS residual of 0.4209 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
1.945 AU
Eccentricity
0.4634
Perihelion
1.044 AU
Aphelion
2.846313 AU
Inclination
8.54°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
334.74°

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
2040-Mar-24 14:51 0.162062 AU
24244098 km
6.06 km/s
2059-Feb-23 05:17 0.157427 AU
23550702 km
5.72 km/s
2078-Feb-05 02:49 0.187913 AU
28111395 km
9.38 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
19.9

Orbit Quality

RMS
0.42087
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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