(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	24 May 2025	18.7	95.579 AU	96.365 AU	01h48m	-00°09'	38.9°	0.4°
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
2025-05-24 00:00 UT   01 48 24.5   +00 09 32    96.365   95.579   38.9    0.4   235   18.7 
2025-05-24 07:04 UT   01 48 25.0   +00 09 29    96.362   95.579   39.2    0.4   236   18.7 
2025-05-25 00:00 UT   01 48 26.4   +00 09 23    96.355   95.579   39.8    0.4   236   18.7 
2025-05-26 00:00 UT   01 48 28.4   +00 09 14    96.344   95.579   40.7    0.4   236   18.7 
2025-05-27 00:00 UT   01 48 30.3   +00 09 05    96.333   95.578   41.6    0.4   237   18.7 
2025-05-28 00:00 UT   01 48 32.2   +00 08 57    96.322   95.578   42.5    0.4   237   18.7 
2025-05-29 00:00 UT   01 48 34.1   +00 08 48    96.311   95.578   43.5    0.4   238   18.7 
2025-05-30 00:00 UT   01 48 36.0   +00 08 40    96.300   95.578   44.4    0.4   238   18.7 
2025-05-31 00:00 UT   01 48 37.8   +00 08 33    96.288   95.577   45.3    0.4   238   18.7 
2025-06-01 00:00 UT   01 48 39.6   +00 08 25    96.276   95.577   46.2    0.4   239   18.7 
2025-06-02 00:00 UT   01 48 41.4   +00 08 18    96.264   95.577   47.1    0.4   239   18.7 
2025-06-03 00:00 UT   01 48 43.2   +00 08 10    96.252   95.577   48.1    0.5   239   18.7 
2025-06-04 00:00 UT   01 48 44.9   +00 08 04    96.239   95.576   49.0    0.5   240   18.7 
2025-06-05 00:00 UT   01 48 46.6   +00 07 57    96.227   95.576   49.9    0.5   240   18.7 
2025-06-06 00:00 UT   01 48 48.3   +00 07 50    96.214   95.576   50.8    0.5   240   18.7 
2025-06-07 00:00 UT   01 48 50.0   +00 07 44    96.201   95.576   51.7    0.5   240   18.7 
2025-06-08 00:00 UT   01 48 51.6   +00 07 38    96.188   95.575   52.7    0.5   241   18.7 
2025-06-09 00:00 UT   01 48 53.2   +00 07 33    96.174   95.575   53.6    0.5   241   18.7 
2025-06-10 00:00 UT   01 48 54.8   +00 07 27    96.161   95.575   54.5    0.5   241   18.7 
2025-06-11 00:00 UT   01 48 56.3   +00 07 22    96.147   95.575   55.4    0.5   242   18.7 
2025-06-12 00:00 UT   01 48 57.9   +00 07 17    96.133   95.574   56.4    0.5   242   18.7 
2025-06-13 00:00 UT   01 48 59.3   +00 07 12    96.119   95.574   57.3    0.5   242   18.7 
2025-06-14 00:00 UT   01 49 00.8   +00 07 08    96.105   95.574   58.2    0.5   242   18.7 
2025-06-15 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 

    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.