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Trans-Neptunian object

2013 UE31

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(2013 UE31)

2013 UE31 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 37.65 AU to 56.63 AU from the Sun; one orbit takes 323.7 years. Orbit from the JPL solution of 8 September 2021.

Where is it now

Distance from Sun
40.289 AU
True anomaly
52.43°
Distance from Earth
39.949 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 2013 UE31 — 40.289 AU from the Sun 2013 UE31
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2013 UE31 is 39.949 AU from Earth today (5.5 light-hours).

In the sky

Right ascension
21h 58m 02s
Declination
-29° 03′ 27″
Constellation
Piscis Austrinus
Distance from Earth
39.96 AU
Elongation from the Sun
108.43° — well clear of the Sun

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
47.144 AU
Eccentricity
0.2013
Inclination
38.85°
Orbital period
323.7 years
Perihelion
37.655 AU
Aphelion
56.633 AU
Longitude of ascending node
342.96°
Argument of periapsis
282.38°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,343.2 LD
36.8557 AU
Tisserand (Jupiter)
4.703

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
41
Data arc
3.98 years
First observed
30 October 2013
Last observed
22 October 2017
Residual RMS
0.11 ″
Solution · Otto Matic
8 September 2021

Visual & observation

Absolute magnitude (H)
6.51

Discovery & classification

TNO

Sources