136199 Eris (Dwarf planet)
© NASA/Hubble Space Telescope
From South El Monte , 136199 Eris is visible in the dawn sky, rising at 02:03 (PDT) – 3 hours and 38 minutes before the Sun – and reaching an altitude of 28° above the eastern horizon before fading from view as dawn breaks at around 04:29.
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Name
136199 Eris
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Object type
Dwarf planet
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Current position
| Computed for: | 30 June 2025 |
| Right ascension: | 01h49m [1] |
| Declination: | −00°06' [1] |
| Constellation: | Cetus |
| Magnitude: | 18.70 (V) [1] |
| Distance: | 95.86 AU 797.22 lightmin [1] |
| Angular motion (speed): | 1.43 deg/yr[1] |
| Angular motion (pos ang): | 87.3° |
Orbital elements [1]
| Semi-major axis: | 68.08 AU |
| Eccentricity: | 0.434969 |
| Inclination: | 43.80° |
| Longitude ascending node: | 36.06° |
| Argument of perihelion: | 150.70° |
| Epoch of elements: | 25 January 2025 |
| Mean Anomaly at epoch: | 210.83° |
| Absolute mag (H): | -1.22 [1] |
| Slope parameter (G): | 0.15 [1] |
Derived quantities
| Perihelion: | 38.47 AU |
| Aphelion: | 97.70 AU |
| Orbital period: | 561.76 years |
Events
| 18 Oct 2025 | – 136199 Eris at opposition |
| 14 Apr 2026 | – 136199 Eris at solar conjunction |
| 18 Oct 2026 | – 136199 Eris at opposition |
| 15 Apr 2027 | – 136199 Eris at solar conjunction |
| 18 Oct 2027 | – 136199 Eris at opposition |
| 14 Apr 2028 | – 136199 Eris at solar conjunction |
| 18 Oct 2028 | – 136199 Eris at opposition |
| 15 Apr 2029 | – 136199 Eris at solar conjunction |
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