(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	1 May 2025	18.7	95.585 AU	96.538 AU	01h47m	-00°13'	18.8°	0.2°
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
2025-05-01 00:00 UT   01 47 34.4   +00 13 59    96.538   95.585   18.8    0.2   216   18.7 
2025-05-01 07:53 UT   01 47 35.1   +00 13 54    96.536   95.584   19.1    0.2   216   18.7 
2025-05-02 00:00 UT   01 47 36.7   +00 13 45    96.533   95.584   19.6    0.2   217   18.7 
2025-05-03 00:00 UT   01 47 39.0   +00 13 32    96.528   95.584   20.4    0.2   219   18.7 
2025-05-04 00:00 UT   01 47 41.3   +00 13 18    96.523   95.584   21.3    0.2   220   18.7 
2025-05-05 00:00 UT   01 47 43.6   +00 13 05    96.517   95.584   22.1    0.2   221   18.7 
2025-05-06 00:00 UT   01 47 45.9   +00 12 52    96.512   95.583   22.9    0.2   223   18.7 
2025-05-07 00:00 UT   01 47 48.1   +00 12 40    96.506   95.583   23.8    0.2   224   18.7 
2025-05-08 00:00 UT   01 47 50.4   +00 12 27    96.499   95.583   24.6    0.3   225   18.7 
2025-05-09 00:00 UT   01 47 52.6   +00 12 15    96.493   95.583   25.5    0.3   226   18.7 
2025-05-10 00:00 UT   01 47 54.9   +00 12 02    96.486   95.582   26.4    0.3   227   18.7 
2025-05-11 00:00 UT   01 47 57.1   +00 11 50    96.479   95.582   27.2    0.3   228   18.7 
2025-05-12 00:00 UT   01 47 59.3   +00 11 39    96.472   95.582   28.1    0.3   228   18.7 
2025-05-13 00:00 UT   01 48 01.5   +00 11 27    96.464   95.582   29.0    0.3   229   18.7 
2025-05-14 00:00 UT   01 48 03.6   +00 11 15    96.456   95.581   29.9    0.3   230   18.7 
2025-05-15 00:00 UT   01 48 05.8   +00 11 04    96.448   95.581   30.8    0.3   231   18.7 
2025-05-16 00:00 UT   01 48 07.9   +00 10 53    96.440   95.581   31.7    0.3   231   18.7 
2025-05-17 00:00 UT   01 48 10.1   +00 10 42    96.432   95.581   32.6    0.3   232   18.7 
2025-05-18 00:00 UT   01 48 12.2   +00 10 32    96.423   95.580   33.5    0.3   232   18.7 
2025-05-19 00:00 UT   01 48 14.3   +00 10 21    96.414   95.580   34.4    0.3   233   18.7 
2025-05-20 00:00 UT   01 48 16.3   +00 10 11    96.405   95.580   35.3    0.4   234   18.7 
2025-05-21 00:00 UT   01 48 18.4   +00 10 01    96.395   95.580   36.2    0.4   234   18.7 
2025-05-22 00:00 UT   01 48 20.4   +00 09 51    96.385   95.580   37.1    0.4   235   18.7 
2025-05-23 00:00 UT   01 48 22.5   +00 09 41    96.375   95.579   38.0    0.4   235   18.7 
2025-05-24 00:00 UT   01 48 24.5   +00 09 32    96.365   95.579   38.9    0.4   235   18.7 
2025-05-25 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 

    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.