SpaceAtlas Space Object Data
NASA JPL SBDB · 2007 RU9

2007 RU9

2007 RU9 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.919 AU it takes 2.66 yr to circle the Sun.

Apollo Observations: 199
Orbital Period · P
2.66 yr
v(q)
45.1 km/s
v(Q)
10.2 km/s
Diameter · ≈
0.24 km
TJ
3.65
Eccentricity · e
0.6297

Orbit and dynamics

Between its closest point (0.711 AU) and its farthest (3.127 AU), the heliocentric distance changes by 2.416 AU over every revolution.

One full revolution takes 2.66 yr (971 days), computed from the semi-major axis of 1.919 AU.

The high eccentricity (0.63) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 5.66° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 45.1 km/s at perihelion and falls to 10.2 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 = 20.88 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.24 km.

Observation record and orbit quality

Astrometry from 199 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4868 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
1.919 AU
Eccentricity
0.6297
Perihelion
0.711 AU
Aphelion
3.127394 AU
Inclination
5.66°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
347.37°

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-Sep-20 10:20 0.309035 AU
46230904 km
25.80 km/s
2039-Sep-13 08:28 0.453383 AU
67825096 km
30.07 km/s
2053-Mar-27 22:38 0.391874 AU
58623456 km
28.37 km/s
2061-Mar-18 05:59 0.199129 AU
29789268 km
22.70 km/s
2069-Mar-08 20:15 0.043998 AU
6581991 km
18.02 km/s
2077-Mar-02 17:00 0.040198 AU
6013552 km
15.58 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
20.88

Orbit Quality

RMS
0.48681
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.

Keep exploring

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