(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	14 Jun 2025	18.7	95.574 AU	96.105 AU	01h49m	-00°07'	58.2°	0.5°
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
2025-06-14 00:00 UT   01 49 00.8   +00 07 08    96.105   95.574   58.2    0.5   242   18.7 
2025-06-14 06:13 UT   01 49 01.2   +00 07 07    96.101   95.574   58.5    0.5   242   18.7 
2025-06-15 00:00 UT   01 49 02.2   +00 07 03    96.091   95.574   59.2    0.5   243   18.7 
2025-06-16 00:00 UT   01 49 03.6   +00 06 59    96.076   95.574   60.1    0.5   243   18.7 
2025-06-17 00:00 UT   01 49 05.0   +00 06 56    96.062   95.573   61.0    0.5   243   18.7 
2025-06-18 00:00 UT   01 49 06.3   +00 06 52    96.047   95.573   61.9    0.5   243   18.7 
2025-06-19 00:00 UT   01 49 07.6   +00 06 49    96.032   95.573   62.9    0.5   243   18.7 
2025-06-20 00:00 UT   01 49 08.9   +00 06 46    96.017   95.573   63.8    0.5   244   18.7 
2025-06-21 00:00 UT   01 49 10.1   +00 06 43    96.002   95.572   64.7    0.6   244   18.7 
2025-06-22 00:00 UT   01 49 11.3   +00 06 40    95.987   95.572   65.7    0.6   244   18.7 
2025-06-23 00:00 UT   01 49 12.5   +00 06 38    95.971   95.572   66.6    0.6   244   18.7 
2025-06-24 00:00 UT   01 49 13.6   +00 06 36    95.956   95.572   67.5    0.6   244   18.7 
2025-06-25 00:00 UT   01 49 14.7   +00 06 34    95.940   95.571   68.4    0.6   245   18.7 
2025-06-26 00:00 UT   01 49 15.8   +00 06 32    95.925   95.571   69.4    0.6   245   18.7 
2025-06-27 00:00 UT   01 49 16.8   +00 06 31    95.909   95.571   70.3    0.6   245   18.7 
2025-06-28 00:00 UT   01 49 17.8   +00 06 30    95.893   95.571   71.2    0.6   245   18.7 
2025-06-29 00:00 UT   01 49 18.8   +00 06 29    95.877   95.570   72.2    0.6   245   18.7 
2025-06-30 00:00 UT   01 49 19.7   +00 06 28    95.861   95.570   73.1    0.6   246   18.7 
2025-07-01 00:00 UT   01 49 20.6   +00 06 28    95.845   95.570   74.0    0.6   246   18.7 
2025-07-02 00:00 UT   01 49 21.5   +00 06 28    95.828   95.570   75.0    0.6   246   18.7 
2025-07-03 00:00 UT   01 49 22.3   +00 06 28    95.812   95.569   75.9    0.6   246   18.7 
2025-07-04 00:00 UT   01 49 23.1   +00 06 28    95.796   95.569   76.8    0.6   246   18.7 
2025-07-05 00:00 UT   01 49 23.8   +00 06 29    95.779   95.569   77.8    0.6   247   18.7 
2025-07-06 00:00 UT   01 49 24.5   +00 06 30    95.763   95.569   78.7    0.6   247   18.7 
2025-07-07 00:00 UT   01 49 25.2   +00 06 31    95.746   95.568   79.6    0.6   247   18.7 
2025-07-08 00:00 UT   01 49 25.9   +00 06 32    95.730   95.568   80.6    0.6   247   18.7 
2025-07-09 00:00 UT   01 49 26.5   +00 06 34    95.713   95.568   81.5    0.6   247   18.7 
2025-07-10 00:00 UT   01 49 27.0   +00 06 36    95.696   95.568   82.4    0.6   248   18.7 
2025-07-11 00:00 UT   01 49 27.6   +00 06 38    95.680   95.567   83.4    0.6   248   18.7 
2025-07-12 00:00 UT   01 49 28.0   +00 06 40    95.663   95.567   84.3    0.6   248   18.7 
2025-07-13 00:00 UT   01 49 28.5   +00 06 42    95.646   95.567   85.2    0.6   248   18.7 
2025-07-14 00:00 UT   01 49 28.9   +00 06 45    95.629   95.567   86.2    0.6   248   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.