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Trans-Neptunian object

505477

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505477 (2013 UM15)

Where is it now

Distance from Sun
45.314 AU
True anomaly
96.74°
Distance from Earth
44.321 AU
As of
22 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 505477 — 45.314 AU from the Sun 505477
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 505477 is 44.321 AU from Earth today (6.1 light-hours).

In the sky

Right ascension
02h 01m 53s
Declination
+10° 25′ 55″
Constellation
Pisces
Distance from Earth
44.32 AU
Elongation from the Sun
176.93° — 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
45.166 AU
Eccentricity
0.0721
Inclination
1.84°
Orbital period
303.5 years
Perihelion
41.911 AU
Aphelion
48.42 AU
Longitude of ascending node
111.01°
Argument of periapsis
184.19°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,914.9 LD
40.8943 AU
Tisserand (Jupiter)
5.989

Orbit quality

Orbit reasonably well determined (uncertainty code 3).

Observations used
51
Data arc
14.89 years
First observed
5 October 2002
Last observed
25 August 2017
Residual RMS
0.14 ″
Solution · Otto Matic
14 April 2021

Physical properties

Rotation period
6.42 hours

Visual & observation

Absolute magnitude (H)
7.04

Discovery & classification

Discovered by
Outer Solar System Origins Survey
Discovery date
31 October 2013
Discovery site
Maunakea

Also known as 2013 UM15

TNO

Sources