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Trans-Neptunian object

Arawn

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15810 Arawn (1994 JR1)

Where is it now

Distance from Sun
36.383 AU
True anomaly
56.42°
Distance from Earth
36.245 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 Arawn — 36.383 AU from the Sun Arawn
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Arawn is 36.245 AU from Earth today (5.0 light-hours).

In the sky

Right ascension
20h 09m 43s
Declination
-18° 35′ 39″
Constellation
Capricornus
Distance from Earth
36.25 AU
Elongation from the Sun
96.89° — well clear of the Sun

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
39.201 AU
Eccentricity
0.1145
Inclination
3.81°
Orbital period
245.4 years
Perihelion
34.712 AU
Aphelion
43.69 AU
Longitude of ascending node
144.73°
Argument of periapsis
100.91°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 13,115.6 LD
33.7012 AU
Tisserand (Jupiter)
5.574

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
104
Data arc
29.4 years
First observed
12 May 1994
Last observed
7 October 2023
Residual RMS
0.41 ″
Solution · Otto Matic
2 July 2025

Physical properties

Rotation period
5.49 hours

Visual & observation

Absolute magnitude (H)
7.68

Discovery & classification

Discovered by
Irwin, M. J., Zytkow, A.
Discovery date
12 May 1994
Discovery site
La Palma

The Middle Welsh <i>Pedair Cainc Y Mabinogi</i> (<i>Four Branches of the Mabinogi</i>) describes Arawn as the ruler of the Celtic otherworld, Annwn.

Also known as 15810 · 1994 JR1

Named TNO

Sources