Skip to content
Public Universe
Trans-Neptunian object

2006 TK121

Add to an observing list or journal →

(2006 TK121)

Where is it now

Distance from Sun
30.743 AU
True anomaly
323.85°
Distance from Earth
30.146 AU
As of
17 October 2026

Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.

Sun Earth — 0.996 AU from the Sun Earth 2006 TK121 — 30.743 AU from the Sun 2006 TK121
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2006 TK121 is 30.146 AU from Earth today (4.2 light-hours).

In the sky

Right ascension
04h 59m 08s
Declination
-04° 41′ 12″
Constellation
Eridanus
Distance from Earth
30.14 AU
Elongation from the Sun
126.15° — well clear of the Sun

Visible from both hemispheres.

From your location

See how high it is right now, whether it is up after civil twilight, and when it rises and sets where you are.

How do I find my coordinates?

Google Maps on a computer

  1. Right-click the spot where you'll be observing.
  2. The first line of the menu is the coordinates, e.g. 51.50722, -0.12758 — click it and they're copied.
  3. Paste them above.

Google Maps on a phone

  1. Press and hold the spot to drop a pin.
  2. The coordinates appear in the search bar (or on the pin's card) — tap to copy, then paste above.

A full Google Maps link works too, but the short maps.app.goo.gl share links don't carry coordinates — copy the numbers instead. We round to about a kilometre; that's all the sky calculation needs.

Know your what3words address? Paste it, e.g. ///filled.count.soap. This is optional — the three words are sent to what3words to convert them, and we don't store the address or the result.

Your location stays in your browser and is sent only for this calculation. Using a what3words address is optional; if you do, the three words go to what3words to be converted and we don't record them. Set a location first, then you can save an email alert for this object. See our privacy policy.

Two-body approximation, good to about a degree for the planets — enough to find the constellation and know whether it is up.

Orbital elements

Semi-major axis
39.658 AU
Eccentricity
0.2551
Inclination
27.25°
Orbital period
249.8 years
Perihelion
29.54 AU
Aphelion
49.776 AU
Longitude of ascending node
174.25°
Argument of periapsis
294.62°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 11,149.0 LD
28.6479 AU
Tisserand (Jupiter)
4.878

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
28
Data arc
18.28 years
First observed
30 August 2005
Last observed
11 December 2023
Residual RMS
0.19 ″
Solution · Otto Matic
18 December 2023

Visual & observation

Absolute magnitude (H)
7.66

Discovery & classification

TNO

Sources