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Trans-Neptunian object

2001 OU108

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(2001 OU108)

2001 OU108 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 46.75 AU to 46.75 AU from the Sun; one orbit takes 319.7 years. Orbit from the JPL solution of 14 April 2021.

Where is it now

Distance from Sun
46.754 AU
True anomaly
192.23°
Distance from Earth
46.086 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 2001 OU108 — 46.754 AU from the Sun 2001 OU108
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2001 OU108 is 46.086 AU from Earth today (6.4 light-hours).

In the sky

Right ascension
22h 42m 57s
Declination
+05° 34′ 25″
Constellation
Pegasus
Distance from Earth
46.1 AU
Elongation from the Sun
131.01° — 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
46.752 AU
Eccentricity
0
Inclination
27.49°
Orbital period
319.7 years
Perihelion
46.75 AU
Aphelion
46.754 AU
Longitude of ascending node
320.07°
Argument of periapsis
195.76°
Epoch · J2000
2452122.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 17,801.1 LD
45.7409 AU
Tisserand (Jupiter)
5.429

Orbit quality

Orbit very uncertain — the object may be effectively lost (uncertainty code 9).

Observations used
6
Data arc
16 days
First observed
26 July 2001
Last observed
11 August 2001
Residual RMS
0.14 ″
Solution · Otto Matic
14 April 2021

Visual & observation

Absolute magnitude (H)
6.53

Discovery & classification

TNO

Sources