(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	17 Oct 2025	18.6	95.543 AU	94.564 AU	01h47m	-00°22'	169.3°	0.1°
Today	19 Nov 2025	18.6	95.536 AU	94.711 AU	01h46m	-00°26'	146.4°	0.3°

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)                : 0.4369660
            a (Semimajor axis)              : 67.9972192
            i (Inclination)                 : 43.86905
            Ω (Longitude of ascending node) : 36.02711
            ω (Argument of perihelion)      : 150.72820
            M (Mean anomaly)                : 211.45856
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 14.02357
            B (Latitude of perihelion)      : 19.80687
            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
2025-11-19 00:00 UT   01 46 21.9   +00 26 48    94.711   95.536  146.4    0.3    52   18.6 
2025-11-19 02:18 UT   01 46 21.7   +00 26 48    94.712   95.536  146.3    0.3    52   18.6 
2025-11-20 00:00 UT   01 46 19.9   +00 26 53    94.720   95.535  145.4    0.3    53   18.6 
2025-11-21 00:00 UT   01 46 18.0   +00 26 58    94.729   95.535  144.5    0.3    53   18.6 
2025-11-22 00:00 UT   01 46 16.0   +00 27 03    94.739   95.535  143.5    0.4    54   18.6 
2025-11-23 00:00 UT   01 46 14.1   +00 27 07    94.749   95.535  142.6    0.4    55   18.6 
2025-11-24 00:00 UT   01 46 12.2   +00 27 12    94.759   95.534  141.6    0.4    55   18.6 
2025-11-25 00:00 UT   01 46 10.3   +00 27 16    94.769   95.534  140.6    0.4    56   18.6 
2025-11-26 00:00 UT   01 46 08.5   +00 27 20    94.780   95.534  139.6    0.4    56   18.6 
2025-11-27 00:00 UT   01 46 06.7   +00 27 23    94.791   95.534  138.7    0.4    56   18.6 
2025-11-28 00:00 UT   01 46 04.9   +00 27 27    94.802   95.533  137.7    0.4    57   18.6 
2025-11-29 00:00 UT   01 46 03.1   +00 27 30    94.813   95.533  136.7    0.4    57   18.6 
2025-11-30 00:00 UT   01 46 01.4   +00 27 33    94.825   95.533  135.7    0.4    58   18.6 
2025-12-01 00:00 UT   01 45 59.6   +00 27 35    94.836   95.533  134.7    0.4    58   18.6 
2025-12-02 00:00 UT   01 45 57.9   +00 27 38    94.848   95.532  133.7    0.4    58   18.6 
2025-12-03 00:00 UT   01 45 56.3   +00 27 40    94.860   95.532  132.8    0.4    59   18.6 
2025-12-04 00:00 UT   01 45 54.6   +00 27 42    94.873   95.532  131.8    0.4    59   18.6 
2025-12-05 00:00 UT   01 45 53.0   +00 27 43    94.885   95.532  130.8    0.4    59   18.6 
2025-12-06 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 48    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    94.978   95.530  123.8    0.5    62   18.6 
2025-12-13 00:00 UT   01 45 41.3   +00 27 47    94.992   95.530  122.8    0.5    62   18.6 
2025-12-14 00:00 UT   01 45 39.9   +00 27 47    95.007   95.529  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 45    95.036   95.529  119.8    0.5    63   18.6 
2025-12-17 00:00 UT   01 45 36.1   +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   95.528  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 

    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.