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Trans-Neptunian object

581804

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581804 (2015 KN167)

581804 is a trans-Neptunian object in the Trans-Neptunian object orbit class. Its orbit takes it from 37.54 AU to 57.99 AU from the Sun; one orbit takes 330.1 years. Discovered 24 May 2015 by Outer Solar System Origins Survey. Orbit from the JPL solution of 2 July 2025.

Where is it now

Distance from Sun
42.898 AU
True anomaly
73.07°
Distance from Earth
43.679 AU
As of
25 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 581804 — 42.898 AU from the Sun 581804
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 581804 is 43.679 AU from Earth today (6.1 light-hours).

In the sky

Right ascension
16h 35m 59s
Declination
-18° 09′ 38″
Constellation
Ophiuchus
Distance from Earth
43.69 AU
Elongation from the Sun
37.18° — near the Sun — look low at dusk or dawn

Favours the southern hemisphere; low or below the horizon from far north.

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
47.762 AU
Eccentricity
0.2141
Inclination
6.04°
Orbital period
330.1 years
Perihelion
37.537 AU
Aphelion
57.987 AU
Longitude of ascending node
111.04°
Argument of periapsis
66.57°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,222.8 LD
36.5463 AU
Tisserand (Jupiter)
5.995

Orbit quality

Orbit reasonably well determined (uncertainty code 3).

Observations used
50
Data arc
7.91 years
First observed
29 May 2014
Last observed
25 April 2022
Residual RMS
0.19 ″
Solution · Otto Matic
2 July 2025

Visual & observation

Absolute magnitude (H)
8.42

Discovery & classification

Discovered by
Outer Solar System Origins Survey
Discovery date
24 May 2015
Discovery site
Maunakea

Also known as 2015 KN167

TNO

Sources