SpaceAtlas Space Object Data
NASA JPL SBDB · 2003 TK1

2003 TK1

2003 TK1 is an Amor-type near-Earth asteroid that approaches Earth from beyond our orbit without crossing it, orbiting the Sun at 1.522 AU once every 1.88 yr.

Amor Observations: 81
Orbital Period · P
1.88 yr
v(q)
32.7 km/s
v(Q)
17.8 km/s
Diameter · ≈
0.05 km
TJ
4.45
Eccentricity · e
0.2933

Orbit and dynamics

The path is an ellipse reaching 1.075 AU from the Sun at perihelion and 1.968 AU at aphelion, a radial span of 0.893 AU.

Applying Kepler's third law to a = 1.522 AU gives an orbital period of 1.88 yr, or about 686 days.

An eccentricity of 0.293 makes the orbit moderately elongated.

The orbital plane is tilted 5.73° relative to the ecliptic.

By the vis-viva equation its orbital speed rises to 32.7 km/s at perihelion and falls to 17.8 km/s at aphelion.

Its perihelion lies just outside Earth's orbit, which is why it is classed as Earth-approaching rather than Earth-crossing.

Size and surface

No direct size measurement is available; from an absolute magnitude of H = 24.3 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.05 km.

Observation record and orbit quality

The current orbit solution is based on 81 observations and has a weighted RMS residual of 0.6068 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
1.522 AU
Eccentricity
0.2933
Perihelion
1.075 AU
Aphelion
1.968403 AU
Inclination
5.73°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
21.9°

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-Oct-27 21:29 0.212884 AU
31847065 km
7.31 km/s
2048-Aug-29 06:39 0.357217 AU
53438854 km
2.22 km/s
2048-Nov-04 10:40 0.346001 AU
51761064 km
10.98 km/s
2050-Sep-13 20:22 0.462747 AU
69225920 km
14.99 km/s
2050-Dec-30 21:25 0.438736 AU
65634020 km
3.98 km/s
2063-Aug-03 08:33 0.445098 AU
66585714 km
3.60 km/s
2063-Nov-12 13:36 0.475338 AU
71109510 km
14.71 km/s
2065-Sep-21 22:23 0.333319 AU
49863809 km
11.24 km/s
2065-Dec-06 17:09 0.352424 AU
52721881 km
1.83 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
24.3

Orbit Quality

RMS
0.60675
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.

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