(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	31 Dec 2025	18.6	95.525 AU	95.269 AU	01h45m	-00°26'	104.8°	0.6°
Opposition	18 Oct 2026	18.6	95.454 AU	94.474 AU	01h48m	-00°06'	169.5°	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)                : 0.4369644
            a (Semimajor axis)              : 67.9971713
            i (Inclination)                 : 43.86903
            Ω (Longitude of ascending node) : 36.02712
            ω (Argument of perihelion)      : 150.72903
            M (Mean anomaly)                : 211.45662
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 14.02425
            B (Latitude of perihelion)      : 19.80632
            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
2025-12-31 00:00 UT   01 45 22.8   +00 26 54    95.269   95.525  104.8    0.6    66   18.6 
2025-12-31 01:34 UT   01 45 22.8   +00 26 54    95.270   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 
2026-01-05 00:00 UT   01 45 19.9   +00 26 25    95.352   95.524   99.8    0.6    67   18.6 
2026-01-06 00:00 UT   01 45 19.4   +00 26 18    95.369   95.524   98.8    0.6    67   18.6 
2026-01-07 00:00 UT   01 45 19.0   +00 26 11    95.385   95.524   97.8    0.6    67   18.6 
2026-01-08 00:00 UT   01 45 18.6   +00 26 04    95.402   95.523   96.8    0.6    67   18.6 
2026-01-09 00:00 UT   01 45 18.2   +00 25 56    95.419   95.523   95.8    0.6    68   18.6 
2026-01-10 00:00 UT   01 45 17.9   +00 25 49    95.436   95.523   94.8    0.6    68   18.6 
2026-01-11 00:00 UT   01 45 17.7   +00 25 41    95.453   95.523   93.8    0.6    68   18.6 
2026-01-12 00:00 UT   01 45 17.4   +00 25 32    95.470   95.522   92.8    0.6    68   18.7 
2026-01-13 00:00 UT   01 45 17.2   +00 25 24    95.487   95.522   91.8    0.6    68   18.7 
2026-01-14 00:00 UT   01 45 17.1   +00 25 15    95.503   95.522   90.8    0.6    69   18.7 
2026-01-15 00:00 UT   01 45 17.0   +00 25 06    95.520   95.522   89.8    0.6    69   18.7 
2026-01-16 00:00 UT   01 45 16.9   +00 24 57    95.537   95.521   88.8    0.6    69   18.7 
2026-01-17 00:00 UT   01 45 16.9   +00 24 48    95.554   95.521   87.8    0.6    69   18.7 
2026-01-18 00:00 UT   01 45 16.9   +00 24 38    95.571   95.521   86.8    0.6    69   18.7 
2026-01-19 00:00 UT   01 45 17.0   +00 24 28    95.588   95.521   85.8    0.6    70   18.7 
2026-01-20 00:00 UT   01 45 17.1   +00 24 18    95.605   95.520   84.8    0.6    70   18.7 
2026-01-21 00:00 UT   01 45 17.2   +00 24 08    95.622   95.520   83.8    0.6    70   18.7 
2026-01-22 00:00 UT   01 45 17.4   +00 23 57    95.639   95.520   82.8    0.6    70   18.7 
2026-01-23 00:00 UT   01 45 17.7   +00 23 47    95.655   95.520   81.8    0.6    70   18.7 
2026-01-24 00:00 UT   01 45 17.9   +00 23 36    95.672   95.520   80.8    0.6    70   18.7 
2026-01-25 00:00 UT   01 45 18.2   +00 23 25    95.689   95.519   79.8    0.6    71   18.7 
2026-01-26 00:00 UT   01 45 18.6   +00 23 13    95.706   95.519   78.8    0.6    71   18.7 
2026-01-27 00:00 UT   01 45 19.0   +00 23 02    95.722   95.519   77.8    0.6    71   18.7 
2026-01-28 00:00 UT   01 45 19.4   +00 22 50    95.739   95.519   76.8    0.6    71   18.7 
2026-01-29 00:00 UT   01 45 19.9   +00 22 38    95.755   95.518   75.8    0.6    71   18.7 
2026-01-30 00:00 UT   01 45 20.4   +00 22 26    95.771   95.518   74.8    0.6    72   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.