(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	31 Aug 2025	18.6	95.555 AU	94.885 AU	01h49m	-00°12'	131.4°	0.5°
Opposition	17 Oct 2025	18.6	95.544 AU	94.564 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)                : 0.4356757
            a (Semimajor axis)              : 68.0516301
            i (Inclination)                 : 43.82172
            Ω (Longitude of ascending node) : 36.04599
            ω (Argument of perihelion)      : 150.70976
            M (Mean anomaly)                : 211.04229
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 14.01162
            B (Latitude of perihelion)      : 19.80096
            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
2025-08-31 00:00 UT   01 49 04.3   +00 12 46    94.885   95.555  131.4    0.5   258   18.6 
2025-08-31 20:53 UT   01 49 03.1   +00 12 56    94.874   95.555  132.2    0.4   259   18.6 
2025-09-01 00:00 UT   01 49 02.9   +00 12 57    94.873   95.555  132.3    0.4   259   18.6 
2025-09-02 00:00 UT   01 49 01.5   +00 13 09    94.860   95.555  133.3    0.4   259   18.6 
2025-09-03 00:00 UT   01 49 00.0   +00 13 20    94.848   95.554  134.2    0.4   260   18.6 
2025-09-04 00:00 UT   01 48 58.6   +00 13 32    94.837   95.554  135.1    0.4   260   18.6 
2025-09-05 00:00 UT   01 48 57.1   +00 13 43    94.825   95.554  136.1    0.4   260   18.6 
2025-09-06 00:00 UT   01 48 55.5   +00 13 55    94.814   95.554  137.0    0.4   261   18.6 
2025-09-07 00:00 UT   01 48 54.0   +00 14 07    94.803   95.553  138.0    0.4   261   18.6 
2025-09-08 00:00 UT   01 48 52.4   +00 14 18    94.792   95.553  138.9    0.4   261   18.6 
2025-09-09 00:00 UT   01 48 50.8   +00 14 30    94.781   95.553  139.8    0.4   262   18.6 
2025-09-10 00:00 UT   01 48 49.1   +00 14 42    94.771   95.553  140.8    0.4   262   18.6 
2025-09-11 00:00 UT   01 48 47.4   +00 14 54    94.760   95.552  141.7    0.4   263   18.6 
2025-09-12 00:00 UT   01 48 45.7   +00 15 06    94.750   95.552  142.6    0.4   263   18.6 
2025-09-13 00:00 UT   01 48 44.0   +00 15 18    94.741   95.552  143.6    0.4   264   18.6 
2025-09-14 00:00 UT   01 48 42.3   +00 15 30    94.731   95.552  144.5    0.4   264   18.6 
2025-09-15 00:00 UT   01 48 40.5   +00 15 42    94.722   95.552  145.4    0.3   265   18.6 
2025-09-16 00:00 UT   01 48 38.7   +00 15 55    94.713   95.551  146.4    0.3   265   18.6 
2025-09-17 00:00 UT   01 48 36.9   +00 16 07    94.704   95.551  147.3    0.3   266   18.6 
2025-09-18 00:00 UT   01 48 35.0   +00 16 19    94.695   95.551  148.2    0.3   267   18.6 
2025-09-19 00:00 UT   01 48 33.2   +00 16 31    94.687   95.551  149.1    0.3   267   18.6 
2025-09-20 00:00 UT   01 48 31.3   +00 16 44    94.679   95.550  150.1    0.3   268   18.6 
2025-09-21 00:00 UT   01 48 29.4   +00 16 56    94.671   95.550  151.0    0.3   269   18.6 
2025-09-22 00:00 UT   01 48 27.4   +00 17 08    94.663   95.550  151.9    0.3   270   18.6 
2025-09-23 00:00 UT   01 48 25.5   +00 17 21    94.656   95.550  152.8    0.3   270   18.6 
2025-09-24 00:00 UT   01 48 23.5   +00 17 33    94.649   95.549  153.7    0.3   271   18.6 
2025-09-25 00:00 UT   01 48 21.5   +00 17 45    94.642   95.549  154.6    0.3   272   18.6 
2025-09-26 00:00 UT   01 48 19.5   +00 17 58    94.636   95.549  155.5    0.2   273   18.6 
2025-09-27 00:00 UT   01 48 17.5   +00 18 10    94.630   95.549  156.3    0.2   274   18.6 
2025-09-28 00:00 UT   01 48 15.4   +00 18 22    94.624   95.548  157.2    0.2   276   18.6 
2025-09-29 00:00 UT   01 48 13.3   +00 18 34    94.618   95.548  158.1    0.2   277   18.6 
2025-09-30 00:00 UT   01 48 11.3   +00 18 47    94.613   95.548  158.9    0.2   278   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.