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Trans-Neptunian object

2017 UX51

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(2017 UX51)

Where is it now

Distance from Sun
10.857 AU
True anomaly
72.3°
Distance from Earth
11.681 AU
As of
15 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 — 0.997 AU from the Sun Earth 2017 UX51 — 10.857 AU from the Sun 2017 UX51
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2017 UX51 is 11.681 AU from Earth today (1.6 light-hours).

In the sky

Right ascension
13h 26m 13s
Declination
-41° 31′ 41″
Constellation
Centaurus
Distance from Earth
11.68 AU
Elongation from the Sun
32.73° — near the Sun — look low at dusk or dawn

Favours the southern hemisphere; low or below the horizon from far north.

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
30.634 AU
Eccentricity
0.7514
Inclination
90.43°
Orbital period
169.6 years
Perihelion
7.615 AU
Aphelion
53.653 AU
Longitude of ascending node
217.77°
Argument of periapsis
255.23°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 2,835.4 LD
7.2857 AU
Tisserand (Jupiter)
0.146

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
141
Data arc
9.38 years
First observed
5 December 2015
Last observed
22 April 2025
Residual RMS
0.5 ″
Solution · Otto Matic
14 May 2025

Visual & observation

Absolute magnitude (H)
10.96

Discovery & classification

TNO

Sources