SpaceAtlas Space Object Data
NASA JPL SBDB · 2017 TL4

2017 TL4

2017 TL4 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.297 AU it takes 1.48 yr to circle the Sun.

Apollo Observations: 76
Orbital Period · P
1.48 yr
v(q)
36.5 km/s
v(Q)
18.7 km/s
Diameter · ≈
0.05 km
TJ
4.93
Eccentricity · e
0.322

Orbit and dynamics

Between its closest point (0.879 AU) and its farthest (1.715 AU), the heliocentric distance changes by 0.836 AU over every revolution.

One full revolution takes 1.48 yr (540 days), computed from the semi-major axis of 1.297 AU.

An eccentricity of 0.322 makes the orbit moderately elongated.

The orbital plane is tilted 15.09° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 36.5 km/s at perihelion and falls to 18.7 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 = 24.37 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

Astrometry from 76 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4077 arcseconds.

Condition code U = 2 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
1.297 AU
Eccentricity
0.322
Perihelion
0.879 AU
Aphelion
1.714634 AU
Inclination
15.09°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
266.42°

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
2043-Mar-23 13:04 0.295891 AU
44264717 km
16.42 km/s
2046-Mar-18 10:44 0.178462 AU
26697511 km
9.83 km/s
2048-Oct-31 07:30 0.090187 AU
13491774 km
9.59 km/s
2049-Apr-04 20:01 0.336331 AU
50314428 km
8.79 km/s
2051-Oct-17 08:33 0.198498 AU
29694936 km
15.68 km/s
2052-Apr-25 04:06 0.491038 AU
73458239 km
9.83 km/s
2054-Oct-03 19:51 0.473550 AU
70842090 km
23.08 km/s
2074-Mar-30 18:27 0.466717 AU
69819837 km
21.76 km/s
2077-Mar-20 16:39 0.235337 AU
35205903 km
14.33 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
24.37

Orbit Quality

RMS
0.40771
Condition
2
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.