SpaceAtlas Space Object Data
NASA JPL SBDB · 2004 TO20

2004 TO20

2004 TO20 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.438 AU it takes 1.72 yr to circle the Sun.

Apollo Observations: 104
Orbital Period · P
1.72 yr
v(q)
33.7 km/s
v(Q)
18.3 km/s
Diameter · ≈
0.08 km
TJ
4.61
Eccentricity · e
0.2954

Orbit and dynamics

Between its closest point (1.013 AU) and its farthest (1.863 AU), the heliocentric distance changes by 0.85 AU over every revolution.

One full revolution takes 1.72 yr (630 days), computed from the semi-major axis of 1.438 AU.

An eccentricity of 0.295 makes the orbit moderately elongated.

The orbital plane is tilted 9.56° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 33.7 km/s at perihelion and falls to 18.3 km/s at aphelion.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 23.35 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.08 km.

Observation record and orbit quality

Astrometry from 104 individual observations underpins this orbit; the fit leaves an RMS residual of 0.5517 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
1.438 AU
Eccentricity
0.2954
Perihelion
1.013 AU
Aphelion
1.862785 AU
Inclination
9.56°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
223.96°

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
2035-May-18 15:59 0.460048 AU
68822228 km
6.84 km/s
2035-Oct-19 00:31 0.369459 AU
55270276 km
16.50 km/s
2042-Jul-08 23:22 0.230572 AU
34493108 km
9.26 km/s
2054-Jun-06 16:34 0.359285 AU
53748298 km
4.78 km/s
2054-Oct-10 16:38 0.197387 AU
29528744 km
11.69 km/s
2061-Jun-26 05:32 0.367066 AU
54912364 km
14.46 km/s
2061-Nov-13 12:15 0.442187 AU
66150190 km
5.87 km/s
2073-Oct-01 23:42 0.083882 AU
12548518 km
7.73 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
23.35

Orbit Quality

RMS
0.55175
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

Explore asteroids, comets and near-Earth objects with JPL orbital data.