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Trans-Neptunian object

2012 UM177

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(2012 UM177)

Where is it now

Distance from Sun
42.373 AU
True anomaly
60.46°
Distance from Earth
41.491 AU
As of
20 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 2012 UM177 — 42.373 AU from the Sun 2012 UM177
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2012 UM177 is 41.491 AU from Earth today (5.8 light-hours).

In the sky

Right ascension
03h 00m 34s
Declination
+31° 34′ 43″
Constellation
Perseus
Distance from Earth
41.49 AU
Elongation from the Sun
152.41° — well clear of the Sun

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
43.739 AU
Eccentricity
0.0583
Inclination
16.15°
Orbital period
289.3 years
Perihelion
41.19 AU
Aphelion
46.288 AU
Longitude of ascending node
287.86°
Argument of periapsis
61.82°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 15,650.2 LD
40.2141 AU
Tisserand (Jupiter)
5.679

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
19
Data arc
533 days
First observed
31 August 2011
Last observed
14 February 2013
Residual RMS
0.23 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
8.6

Discovery & classification

TNO

Sources