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Trans-Neptunian object

2013 UJ17

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(2013 UJ17)

Where is it now

Distance from Sun
32.252 AU
True anomaly
6.12°
Distance from Earth
31.309 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 2013 UJ17 — 32.252 AU from the Sun 2013 UJ17
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2013 UJ17 is 31.309 AU from Earth today (4.3 light-hours).

In the sky

Right ascension
02h 43m 07s
Declination
+16° 36′ 20″
Constellation
Aries
Distance from Earth
31.31 AU
Elongation from the Sun
161.01° — near opposition — up most of the night

Favours the northern hemisphere; low or below the horizon from far south.

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
39.719 AU
Eccentricity
0.1887
Inclination
6.82°
Orbital period
250.3 years
Perihelion
32.223 AU
Aphelion
47.215 AU
Longitude of ascending node
36.73°
Argument of periapsis
0.09°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 12,153.7 LD
31.2295 AU
Tisserand (Jupiter)
5.519

Orbit quality

Orbit reasonably well determined (uncertainty code 3).

Observations used
67
Data arc
8.32 years
First observed
2 August 2013
Last observed
27 November 2021
Residual RMS
0.17 ″
Solution · Otto Matic
11 March 2026

Visual & observation

Absolute magnitude (H)
9.07

Discovery & classification

TNO

Sources