SpaceAtlas Space Object Data
NASA JPL SBDB · 2004 YY23

2004 YY23

2004 YY23 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 3.951 AU once every 7.85 yr.

Amor Observations: 157
Orbital Period · P
7.85 yr
v(q)
36.4 km/s
v(Q)
6.2 km/s
Diameter · ≈
0.47 km
TJ
2.39
Eccentricity · e
0.7096

Orbit and dynamics

The path is an ellipse reaching 1.147 AU from the Sun at perihelion and 6.755 AU at aphelion, a radial span of 5.608 AU.

Applying Kepler's third law to a = 3.951 AU gives an orbital period of 7.85 yr, or about 2,868 days.

The high eccentricity (0.71) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 28.66° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 36.4 km/s at perihelion and falls to 6.2 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 = 19.4 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.47 km.

Observation record and orbit quality

The current orbit solution is based on 157 observations and has a weighted RMS residual of 0.3416 arcseconds.

Condition code U = 6 indicates a moderately constrained orbit; predictions decades ahead still carry noticeable uncertainty.

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
3.951 AU
Eccentricity
0.7096
Perihelion
1.147 AU
Aphelion
6.75463 AU
Inclination
28.66°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
265.3°

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

No close approaches to Earth are currently on record for this object.

Physical Parameters

Diameter
— km
Albedo
—
Density
— g/cm³
Rotation Period
— h
Absolute Magnitude
19.4

Orbit Quality

RMS
0.34162
Condition
6
Orbit ID
—
Data source: NASA JPL Small-Body Database . 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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