(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	13 Mar 2025	18.7	95.596 AU	96.423 AU	01h45m	-00°27'	33.6°	0.3°
Opposition	17 Oct 2025	18.6	95.544 AU	94.565 AU	01h47m	-00°22'	169.3°	0.1°

The interactive orbit chart above shows the body's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below. (Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)

The orbital elements of Eris are:

            e (Eccentricity)                : 0.4356752
            a (Semimajor axis)              : 68.0516928
            i (Inclination)                 : 43.82171
            Ω (Longitude of ascending node) : 36.04599
            ω (Argument of perihelion)      : 150.70961
            M (Mean anomaly)                : 211.04259
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 14.01150
            B (Latitude of perihelion)      : 19.80106
            P (Orbital period in years)     : 561.38            
        

The light curve chart below shows the estimated development of the minor planet's magnitude.

The all-sky chart below shows the path of the minor planet over the same period as the light curve. The current position is marked yellow.

The following chart shows the path of the minor planet in the next few days. The field of view is optimized for (~10x50) binoculars and finderscopes. A more printer-friendly version of the same chart can be found below.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-03-13 00:00 UT   01 45 44.2   +00 27 16    96.423   95.596   33.6    0.3    85   18.7 
2025-03-13 17:12 UT   01 45 45.6   +00 27 03    96.429   95.596   32.9    0.3    86   18.7 
2025-03-14 00:00 UT   01 45 46.2   +00 26 59    96.432   95.596   32.6    0.3    86   18.7 
2025-03-15 00:00 UT   01 45 48.1   +00 26 41    96.440   95.596   31.7    0.3    86   18.7 
2025-03-16 00:00 UT   01 45 50.1   +00 26 24    96.449   95.596   30.8    0.3    87   18.7 
2025-03-17 00:00 UT   01 45 52.1   +00 26 07    96.457   95.595   29.9    0.3    88   18.7 
2025-03-18 00:00 UT   01 45 54.1   +00 25 49    96.465   95.595   29.0    0.3    89   18.7 
2025-03-19 00:00 UT   01 45 56.2   +00 25 32    96.472   95.595   28.1    0.3    89   18.7 
2025-03-20 00:00 UT   01 45 58.2   +00 25 15    96.480   95.595   27.2    0.3    90   18.7 
2025-03-21 00:00 UT   01 46 00.3   +00 24 57    96.487   95.594   26.3    0.3    91   18.7 
2025-03-22 00:00 UT   01 46 02.4   +00 24 40    96.494   95.594   25.4    0.3    92   18.7 
2025-03-23 00:00 UT   01 46 04.5   +00 24 22    96.500   95.594   24.5    0.2    93   18.7 
2025-03-24 00:00 UT   01 46 06.7   +00 24 05    96.506   95.594   23.6    0.2    94   18.7 
2025-03-25 00:00 UT   01 46 08.8   +00 23 48    96.513   95.593   22.7    0.2    95   18.7 
2025-03-26 00:00 UT   01 46 11.0   +00 23 31    96.518   95.593   21.9    0.2    97   18.7 
2025-03-27 00:00 UT   01 46 13.2   +00 23 13    96.524   95.593   21.0    0.2    98   18.7 
2025-03-28 00:00 UT   01 46 15.4   +00 22 56    96.529   95.593   20.2    0.2    99   18.7 
2025-03-29 00:00 UT   01 46 17.6   +00 22 39    96.534   95.592   19.4    0.2   101   18.7 
2025-03-30 00:00 UT   01 46 19.8   +00 22 22    96.539   95.592   18.6    0.2   103   18.7 
2025-03-31 00:00 UT   01 46 22.0   +00 22 05    96.543   95.592   17.8    0.2   104   18.7 
2025-04-01 00:00 UT   01 46 24.3   +00 21 48    96.547   95.592   17.0    0.2   107   18.7 
2025-04-02 00:00 UT   01 46 26.6   +00 21 31    96.551   95.592   16.3    0.2   109   18.7 
2025-04-03 00:00 UT   01 46 28.8   +00 21 14    96.554   95.591   15.5    0.2   111   18.7 
2025-04-04 00:00 UT   01 46 31.1   +00 20 57    96.558   95.591   14.8    0.2   114   18.7 
2025-04-05 00:00 UT   01 46 33.4   +00 20 40    96.560   95.591   14.2    0.1   117   18.7 
2025-04-06 00:00 UT   01 46 35.7   +00 20 23    96.563   95.591   13.6    0.1   120   18.7 
2025-04-07 00:00 UT   01 46 38.0   +00 20 07    96.566   95.590   13.0    0.1   123   18.7 
2025-04-08 00:00 UT   01 46 40.4   +00 19 50    96.568   95.590   12.4    0.1   127   18.7 
2025-04-09 00:00 UT   01 46 42.7   +00 19 33    96.569   95.590   12.0    0.1   131   18.7 
2025-04-10 00:00 UT   01 46 45.0   +00 19 17    96.571   95.590   11.5    0.1   135   18.7 
2025-04-11 00:00 UT   01 46 47.4   +00 19 01    96.572   95.589   11.2    0.1   140   18.7 
2025-04-12 00:00 UT   01 46 49.7   +00 18 45    96.573   95.589   10.9    0.1   145   18.7 

    Terminology:
            
    delta:  distance between minor planet and earth in AU
    radius: distance between minor planet and sun in AU
    magn:   magnitude (brightness) estimate    
    ra:     right ascension in hours (24h = 360deg)
    dec:    declination in degrees
    elong:  elongation in degrees (angle sun-earth-minor planet)    
    phase:  phase angle in degrees (angle sun-minor planet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km
    

Orbital elements provided by the MPC (Minor Planet Center).
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.