136199 Eris (Dwarf planet)
© NASA/Hubble Space Telescope
Finder chart
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From South El Monte , 136199 Eris is visible in the morning sky, becoming accessible around 22:46, when it reaches an altitude of 21° above your eastern horizon. It will then reach its highest point in the sky at 02:58, 55° above your southern horizon. It will be lost to dawn twilight around 05:34, 39° above your south-western horizon.
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Name
136199 Eris
|
Object type
Dwarf planet
|
Current position
| Computed for: | 16 September 2025 |
| Right ascension: | 01h48m [1] |
| Declination: | −00°15' [1] |
| Constellation: | Cetus |
| Magnitude: | 18.64 (V) [1] |
| Distance: | 94.71 AU 787.69 lightmin [1] |
| Angular motion (speed): | 3.00 deg/yr[1] |
| Angular motion (pos ang): | 245.6° |
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 |
Visibility from South El Monte
All times shown in South El Monte local time.
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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