SpaceAtlas Space Object Data
NASA JPL SBDB · 2004 RY109

2004 RY109

2004 RY109 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.628 AU it takes 2.08 yr to circle the Sun.

Apollo Observations: 142
Orbital Period · P
2.08 yr
v(q)
36.8 km/s
v(Q)
14.8 km/s
Diameter · ≈
0.53 km
TJ
4.11
Eccentricity · e
0.4249

Orbit and dynamics

The path is an ellipse reaching 0.936 AU from the Sun at perihelion and 2.32 AU at aphelion, a radial span of 1.384 AU.

Applying Kepler's third law to a = 1.628 AU gives an orbital period of 2.08 yr, or about 759 days.

The high eccentricity (0.425) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 26.14° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 36.8 km/s at perihelion and falls to 14.8 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 = 19.12 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.53 km.

Observation record and orbit quality

The current orbit solution is based on 142 observations and has a weighted RMS residual of 0.5709 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
1.628 AU
Eccentricity
0.4249
Perihelion
0.936 AU
Aphelion
2.319737 AU
Inclination
26.14°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
196.53°

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-Apr-29 09:47 0.436609 AU
65315759 km
13.58 km/s
2031-Aug-23 14:16 0.334072 AU
49976478 km
14.33 km/s
2033-Sep-19 12:03 0.158525 AU
23715008 km
19.63 km/s
2058-Apr-29 22:41 0.437080 AU
65386233 km
13.71 km/s
2058-Aug-21 22:35 0.349288 AU
52252690 km
14.39 km/s
2060-Sep-18 11:17 0.142792 AU
21361369 km
19.29 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
19.12

Orbit Quality

RMS
0.5709
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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