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Solar
Dwarf planet

Eris

(136199) Eris

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Where is it now

Distance from Sun
95.458 AU
True anomaly
194.11°
Distance from Earth
94.51 AU
As of
2 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 — 1.001 AU from the Sun Earth Eris — 95.458 AU from the Sun Eris
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Eris is 94.51 AU from Earth today (13.1 light-hours).

In the sky

Right ascension
01h 48m 35s
Declination
-00° 03′ 35″
Constellation
Cetus
Distance from Earth
94.51 AU
Elongation from the Sun
161.78° — near opposition — up most of the night

Visible from both hemispheres.

From your location

See how high it is right now, whether it's up after dark, 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
67.934 AU
Eccentricity
0.4382
Inclination
43.93°
Orbital period
559.9 years
Perihelion
38.163 AU
Aphelion
97.705 AU
Longitude of ascending node
36°
Argument of periapsis
150.79°
Epoch · J2000
2461200.5
Orbit class · TNO
Trans-Neptunian object
Earth MOID · 14,485.4 LD
37.221 AU
Tisserand (Jupiter)
4.755

Orbit quality

Orbit reasonably well determined (uncertainty code 3).

Observations used
4,064
Data arc
71.43 years
First observed
3 September 1954
Last observed
6 February 2026
Residual RMS
0.37 ″
Solution · Otto Matic
6 June 2026

Physical properties

Mean radius
1,163 km
Mass
1.647 × 10²² kg
Density
2.43 g/cm³
Rotation period
15.75 days
Surface gravity
0.82 m/s²
Escape velocity
1.38 km/s

Visual & observation

Geometric albedo
0.96
Absolute magnitude (H)
-1.21
Representative colour
#D8D6CF

Discovery & classification

Discovered by
Brown, M. E., Trujillo, C. A., Rabinowitz, D. L.
Discovery date
21 October 2003
Discovery site
Palomar

Eris is the Greek goddess of discord and strife. She stirs up jealousy and envy to cause fighting and anger among men. At the wedding of Peleus and Thetis all the gods were invited with the exception of Eris, and, enraged at her exclusion, she spitefully caused a quarrel among the goddesses that led to the Trojan war.

Also known as 136199 · 2003 UB313 · 136199 Eris (2003 UB313)

Named TNO

1 moons

Dysnomia 350 km — — — 15.8 days

Sources