SpaceAtlas Space Object Data
NASA JPL SBDB · 2015 TK1

2015 TK1

2015 TK1 belongs to the Apollo group of near-Earth asteroids, whose orbits cross the path of Earth; with a semi-major axis of 1.362 AU it takes 1.59 yr to circle the Sun.

Apollo Observations: 74
Orbital Period · P
1.59 yr
v(q)
40.9 km/s
v(Q)
15.9 km/s
Diameter · ≈
0.13 km
TJ
4.65
Eccentricity · e
0.4389

Orbit and dynamics

Between its closest point (0.764 AU) and its farthest (1.96 AU), the heliocentric distance changes by 1.196 AU over every revolution.

One full revolution takes 1.59 yr (581 days), computed from the semi-major axis of 1.362 AU.

The high eccentricity (0.439) produces a strongly elongated orbit, so the object spends most of its time far from the Sun.

A steep inclination of 26.02° carries it well above and below the ecliptic plane.

By the vis-viva equation its orbital speed rises to 40.9 km/s at perihelion and falls to 15.9 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 = 22.18 and an assumed geometric albedo of 0.14, the diameter works out to roughly 0.13 km.

Observation record and orbit quality

Astrometry from 74 individual observations underpins this orbit; the fit leaves an RMS residual of 0.4174 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
1.362 AU
Eccentricity
0.4389
Perihelion
0.764 AU
Aphelion
1.959782 AU
Inclination
26.02°
Orbital Period
— yr
Epoch
2461200.5
Mean Anomaly
202.5°

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-Apr-14 21:25 0.104261 AU
15597281 km
19.93 km/s
2035-Apr-02 19:57 0.221326 AU
33109879 km
14.42 km/s
2042-Oct-29 10:55 0.302370 AU
45233903 km
13.77 km/s
2050-Oct-24 21:25 0.103787 AU
15526305 km
18.36 km/s
2054-Apr-22 08:23 0.274660 AU
41088626 km
24.04 km/s
2058-Oct-13 11:50 0.354105 AU
52973386 km
25.73 km/s
2062-Apr-09 00:22 0.060364 AU
9030286 km
17.12 km/s
2069-Oct-24 04:33 0.436406 AU
65285393 km
13.29 km/s
2070-Mar-30 05:45 0.387924 AU
58032531 km
13.16 km/s
2077-Oct-28 00:23 0.141450 AU
21160693 km
16.02 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
22.18

Orbit Quality

RMS
0.41737
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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