136199 Eris (Dwarf planet)
© NASA/Hubble Space Telescope
Finder chart
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From South El Monte , 136199 Eris is visible in the evening sky, becoming accessible around 17:48 (PST), 44° above your south-eastern horizon, as dusk fades to darkness. It will then reach its highest point in the sky at 19:53, 55° above your southern horizon. It will continue to be observable until around 00:04, when it sinks below 21° above your western horizon.
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Name
136199 Eris
|
Object type
Dwarf planet
|
Current position
| Computed for: | 16 December 2025 |
| Right ascension: | 01h45m [1] |
| Declination: | −00°27' [1] |
| Constellation: | Cetus |
| Magnitude: | 18.63 (V) [1] |
| Distance: | 95.04 AU 790.44 lightmin [1] |
Orbital elements [1]
| Semi-major axis: | 68.00 AU |
| Eccentricity: | 0.436940 |
| Inclination: | 43.87° |
| Longitude ascending node: | 36.03° |
| Argument of perihelion: | 150.73° |
| Epoch of elements: | 21 Nov 2025 |
| Mean Anomaly at epoch: | 211.46° |
| Absolute mag (H): | -1.26 [1] |
| Slope parameter (G): | 0.15 [1] |
Derived quantities
| Perihelion: | 38.29 AU |
| Aphelion: | 97.71 AU |
| Orbital period: | 560.73 years |
Visibility from South El Monte
All times shown in South El Monte local time.
Events
| 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 |
| 18 Oct 2029 | – 136199 Eris at opposition |
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