SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 YY9

2015 YY9

2015 YY9 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.864 AU it takes 2.54 yr to circle the Sun.

Apollo Observations: 110
Orbital Period · P
2.54 yr
v(q)
41.3 km/s
v(Q)
11.5 km/s
Diameter · ≈
0.14 km
TJ
3.77
Eccentricity · e
0.5643

Orbit and dynamics

Between its closest point (0.812 AU) and its farthest (2.916 AU), the heliocentric distance changes by 2.104 AU over every revolution.

One full revolution takes 2.54 yr (930 days), computed from the semi-major axis of 1.864 AU.

The high eccentricity (0.564) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 8.29° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 41.3 km/s at perihelion and falls to 11.5 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 = 22 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.14 km.

Observation record and orbit quality

Astrometry from 110 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4716 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
1.864 AU
Eccentricity
0.5643
Perihelion
0.812 AU
Aphelion
2.915855 AU
Inclination
8.29°
Orbital Period
— yr
Epoch
2457390.5
Mean Anomaly
23.08°

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
22.0

Orbit Quality

RMS
0.47161
Condition
8
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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