Skip to content
Public Universe
Trans-Neptunian object

139775

Add to an observing list or journal →

139775 (2001 QG298)

Where is it now

Distance from Sun
32.677 AU
True anomaly
33.11°
Distance from Earth
31.763 AU
As of
16 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 — 0.997 AU from the Sun Earth 139775 — 32.677 AU from the Sun 139775
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 139775 is 31.763 AU from Earth today (4.4 light-hours).

In the sky

Right ascension
03h 03m 05s
Declination
+11° 02′ 34″
Constellation
Aries
Distance from Earth
31.76 AU
Elongation from the Sun
157° — 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
39.54 AU
Eccentricity
0.1955
Inclination
6.49°
Orbital period
248.6 years
Perihelion
31.809 AU
Aphelion
47.27 AU
Longitude of ascending node
162.58°
Argument of periapsis
210.29°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 11,990.6 LD
30.8105 AU
Tisserand (Jupiter)
5.504

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
415
Data arc
24.32 years
First observed
19 August 2001
Last observed
13 December 2025
Residual RMS
0.49 ″
Solution · Otto Matic
13 March 2026

Physical properties

Rotation period
13.77 hours

Visual & observation

Absolute magnitude (H)
6.84

Discovery & classification

Discovered by
Buie, M. W.
Discovery date
19 August 2001
Discovery site
Cerro Tololo

Also known as 2001 QG298

TNO

Sources