(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	17 Oct 2025	18.6	95.544 AU	94.564 AU	01h47m	-00°22'	169.3°	0.1°
Today	5 Dec 2025	18.6	95.532 AU	94.885 AU	01h45m	-00°27'	130.8°	0.4°

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)                : 0.4369648
            a (Semimajor axis)              : 67.9971870
            i (Inclination)                 : 43.86903
            Ω (Longitude of ascending node) : 36.02712
            ω (Argument of perihelion)      : 150.72879
            M (Mean anomaly)                : 211.45716
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 14.02405
            B (Latitude of perihelion)      : 19.80648
            P (Orbital period in years)     : 560.71            
        

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.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-05 00:00 UT   01 45 53.0   +00 27 43    94.885   95.532  130.8    0.4    59   18.6 
2025-12-05 05:52 UT   01 45 52.7   +00 27 44    94.888   95.532  130.5    0.4    60   18.6 
2025-12-06 00:00 UT   01 45 51.5   +00 27 45    94.898   95.531  129.8    0.5    60   18.6 
2025-12-07 00:00 UT   01 45 49.9   +00 27 46    94.911   95.531  128.8    0.5    60   18.6 
2025-12-08 00:00 UT   01 45 48.4   +00 27 47    94.924   95.531  127.8    0.5    60   18.6 
2025-12-09 00:00 UT   01 45 46.9   +00 27 47    94.937   95.531  126.8    0.5    61   18.6 
2025-12-10 00:00 UT   01 45 45.4   +00 27 48    94.951   95.530  125.8    0.5    61   18.6 
2025-12-11 00:00 UT   01 45 44.0   +00 27 48    94.965   95.530  124.8    0.5    61   18.6 
2025-12-12 00:00 UT   01 45 42.6   +00 27 48    94.979   95.530  123.8    0.5    62   18.6 
2025-12-13 00:00 UT   01 45 41.3   +00 27 47    94.993   95.530  122.8    0.5    62   18.6 
2025-12-14 00:00 UT   01 45 39.9   +00 27 47    95.007   95.530  121.8    0.5    62   18.6 
2025-12-15 00:00 UT   01 45 38.6   +00 27 46    95.021   95.529  120.8    0.5    62   18.6 
2025-12-16 00:00 UT   01 45 37.4   +00 27 44    95.036   95.529  119.8    0.5    63   18.6 
2025-12-17 00:00 UT   01 45 36.2   +00 27 43    95.050   95.529  118.8    0.5    63   18.6 
2025-12-18 00:00 UT   01 45 35.0   +00 27 41    95.065   95.529  117.8    0.5    63   18.6 
2025-12-19 00:00 UT   01 45 33.8   +00 27 39    95.080   95.528  116.8    0.5    63   18.6 
2025-12-20 00:00 UT   01 45 32.7   +00 27 37    95.095   95.528  115.8    0.5    64   18.6 
2025-12-21 00:00 UT   01 45 31.6   +00 27 34    95.111   95.528  114.8    0.5    64   18.6 
2025-12-22 00:00 UT   01 45 30.5   +00 27 32    95.126   95.528  113.8    0.5    64   18.6 
2025-12-23 00:00 UT   01 45 29.5   +00 27 29    95.141   95.527  112.8    0.5    64   18.6 
2025-12-24 00:00 UT   01 45 28.6   +00 27 25    95.157   95.527  111.8    0.5    64   18.6 
2025-12-25 00:00 UT   01 45 27.6   +00 27 22    95.173   95.527  110.8    0.6    65   18.6 
2025-12-26 00:00 UT   01 45 26.7   +00 27 18    95.189   95.527  109.8    0.6    65   18.6 
2025-12-27 00:00 UT   01 45 25.9   +00 27 14    95.205   95.526  108.8    0.6    65   18.6 
2025-12-28 00:00 UT   01 45 25.0   +00 27 09    95.221   95.526  107.8    0.6    65   18.6 
2025-12-29 00:00 UT   01 45 24.3   +00 27 05    95.237   95.526  106.8    0.6    66   18.6 
2025-12-30 00:00 UT   01 45 23.5   +00 26 60    95.253   95.526  105.8    0.6    66   18.6 
2025-12-31 00:00 UT   01 45 22.8   +00 26 54    95.269   95.525  104.8    0.6    66   18.6 
2026-01-01 00:00 UT   01 45 22.1   +00 26 49    95.286   95.525  103.8    0.6    66   18.6 
2026-01-02 00:00 UT   01 45 21.5   +00 26 43    95.302   95.525  102.8    0.6    66   18.6 
2026-01-03 00:00 UT   01 45 20.9   +00 26 37    95.319   95.525  101.8    0.6    67   18.6 
2026-01-04 00:00 UT   01 45 20.4   +00 26 31    95.335   95.524  100.8    0.6    67   18.6 

    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.