SpaceAtlas Space Object Data
NASA JPL SBDB · 2004 TN20

2004 TN20

2004 TN20 is an Aten-type near-Earth asteroid whose orbit lies mostly inside that of Earth, with a semi-major axis of 0.947 AU and a period of 0.92 yr.

Aten Observations: 17
Orbital Period · P
0.92 yr
v(q)
39.9 km/s
v(Q)
23.5 km/s
Diameter · ≈
0.04 km
TJ
6.3
Eccentricity · e
0.2593

Orbit and dynamics

The path is an ellipse reaching 0.701 AU from the Sun at perihelion and 1.192 AU at aphelion, a radial span of 0.491 AU.

Applying Kepler's third law to a = 0.947 AU gives an orbital period of 0.92 yr, or about 336 days.

An eccentricity of 0.259 makes the orbit moderately elongated.

The orbital plane is tilted 14.09° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 39.9 km/s at perihelion and falls to 23.5 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 = 24.9 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.04 km.

Observation record and orbit quality

The current orbit solution is based on 17 observations and has a weighted RMS residual of 0.4094 arcseconds.

Condition code U = 7 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
0.9466 AU
Eccentricity
0.2593
Perihelion
0.701 AU
Aphelion
1.192053 AU
Inclination
14.09°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
277.69°

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
2027-Oct-15 05:57 0.023139 AU
3461585 km
13.60 km/s
2039-Oct-13 03:49 0.022034 AU
3296199 km
10.61 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
24.9

Orbit Quality

RMS
0.40941
Condition
7
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.

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