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Trans-Neptunian object

416400

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416400 (2003 UZ117)

Where is it now

Distance from Sun
38.438 AU
True anomaly
349.48°
Distance from Earth
37.844 AU
As of
21 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 — 0.995 AU from the Sun Earth 416400 — 38.438 AU from the Sun 416400
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 416400 is 37.844 AU from Earth today (5.2 light-hours).

In the sky

Right ascension
05h 18m 07s
Declination
+00° 12′ 20″
Constellation
Orion
Distance from Earth
37.84 AU
Elongation from the Sun
126.7° — 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
44.556 AU
Eccentricity
0.1391
Inclination
27.41°
Orbital period
297.4 years
Perihelion
38.359 AU
Aphelion
50.752 AU
Longitude of ascending node
204.61°
Argument of periapsis
246.54°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,581.8 LD
37.4688 AU
Tisserand (Jupiter)
5.262

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
602
Data arc
23.2 years
First observed
13 November 2002
Last observed
26 January 2026
Residual RMS
0.47 ″
Solution · Otto Matic
7 June 2026

Physical properties

Rotation period
10.61 hours

Visual & observation

Absolute magnitude (H)
5.22

Discovery & classification

Discovered by
Spacewatch
Discovery date
24 October 2003
Discovery site
Kitt Peak

Also known as 2003 UZ117

TNO

Sources