SpaceAtlas Space Object Data
NASA JPL SBDB · 2004 RX164

2004 RX164

2004 RX164 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.706 AU it takes 2.23 yr to circle the Sun.

Apollo Observations: 107
Orbital Period · P
2.23 yr
v(q)
38.7 km/s
v(Q)
13.4 km/s
Diameter · ≈
0.2 km
TJ
4.03
Eccentricity · e
0.4848

Orbit and dynamics

The path is an ellipse reaching 0.879 AU from the Sun at perihelion and 2.533 AU at aphelion, a radial span of 1.654 AU.

Applying Kepler's third law to a = 1.706 AU gives an orbital period of 2.23 yr, or about 814 days.

The high eccentricity (0.485) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

The orbital plane is tilted 12.49° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 38.7 km/s at perihelion and falls to 13.4 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 = 21.28 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.2 km.

Observation record and orbit quality

The current orbit solution is based on 107 observations and has a weighted RMS residual of 0.4909 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
1.706 AU
Eccentricity
0.4848
Perihelion
0.879 AU
Aphelion
2.533069 AU
Inclination
12.49°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
299.26°

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
2033-May-15 12:06 0.190224 AU
28457127 km
9.87 km/s
2042-Apr-14 00:25 0.481167 AU
71981577 km
25.68 km/s
2044-Oct-02 01:25 0.419931 AU
62820815 km
24.63 km/s
2053-Aug-26 11:21 0.163873 AU
24515026 km
9.83 km/s
2062-Apr-28 17:07 0.214300 AU
32058884 km
16.94 km/s
2073-Sep-18 21:02 0.153210 AU
22919840 km
16.89 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
21.28

Orbit Quality

RMS
0.49088
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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