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Trans-Neptunian object

2004 XX186

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(2004 XX186)

2004 XX186 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 46.9 AU to 46.91 AU from the Sun; one orbit takes 321.2 years. Orbit from the JPL solution of 14 April 2021.

Where is it now

Distance from Sun
46.908 AU
True anomaly
154.19°
Distance from Earth
45.927 AU
As of
24 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 — 0.994 AU from the Sun Earth 2004 XX186 — 46.908 AU from the Sun 2004 XX186
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2004 XX186 is 45.927 AU from Earth today (6.4 light-hours).

In the sky

Right ascension
02h 35m 11s
Declination
+13° 42′ 55″
Constellation
Aries
Distance from Earth
45.93 AU
Elongation from the Sun
171.28° — near opposition — up most of the night

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
46.905 AU
Eccentricity
0.0001
Inclination
1.73°
Orbital period
321.2 years
Perihelion
46.901 AU
Aphelion
46.909 AU
Longitude of ascending node
93.41°
Argument of periapsis
152.97°
Epoch · J2000
2453352.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 17,856.3 LD
45.8827 AU
Tisserand (Jupiter)
6.113

Orbit quality

Orbit very uncertain — the object may be effectively lost (uncertainty code 9).

Observations used
3
Data arc
2 days
First observed
12 December 2004
Last observed
14 December 2004
Residual RMS
0.03 ″
Solution · Otto Matic
14 April 2021

Visual & observation

Absolute magnitude (H)
8.64

Discovery & classification

TNO

Sources