(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	8 Aug 2025	18.7	95.561 AU	95.215 AU	01h49m	-00°09'	109.7°	0.6°
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
2025-08-08 00:00 UT   01 49 26.8   +00 09 02    95.215   95.561  109.7    0.6   253   18.7 
2025-08-08 08:08 UT   01 49 26.6   +00 09 05    95.209   95.561  110.0    0.6   253   18.7 
2025-08-09 00:00 UT   01 49 26.2   +00 09 11    95.199   95.560  110.6    0.6   253   18.7 
2025-08-10 00:00 UT   01 49 25.6   +00 09 19    95.183   95.560  111.6    0.6   253   18.7 
2025-08-11 00:00 UT   01 49 24.9   +00 09 27    95.168   95.560  112.5    0.6   253   18.7 
2025-08-12 00:00 UT   01 49 24.2   +00 09 36    95.152   95.560  113.4    0.6   254   18.7 
2025-08-13 00:00 UT   01 49 23.5   +00 09 44    95.137   95.559  114.4    0.6   254   18.6 
2025-08-14 00:00 UT   01 49 22.7   +00 09 53    95.122   95.559  115.3    0.5   254   18.6 
2025-08-15 00:00 UT   01 49 21.9   +00 10 02    95.107   95.559  116.3    0.5   254   18.6 
2025-08-16 00:00 UT   01 49 21.1   +00 10 12    95.092   95.559  117.2    0.5   254   18.6 
2025-08-17 00:00 UT   01 49 20.2   +00 10 21    95.077   95.559  118.2    0.5   255   18.6 
2025-08-18 00:00 UT   01 49 19.3   +00 10 30    95.062   95.558  119.1    0.5   255   18.6 
2025-08-19 00:00 UT   01 49 18.3   +00 10 40    95.047   95.558  120.0    0.5   255   18.6 
2025-08-20 00:00 UT   01 49 17.4   +00 10 50    95.033   95.558  121.0    0.5   255   18.6 
2025-08-21 00:00 UT   01 49 16.3   +00 10 60    95.019   95.558  121.9    0.5   256   18.6 
2025-08-22 00:00 UT   01 49 15.3   +00 11 10    95.005   95.557  122.9    0.5   256   18.6 
2025-08-23 00:00 UT   01 49 14.2   +00 11 20    94.991   95.557  123.8    0.5   256   18.6 
2025-08-24 00:00 UT   01 49 13.1   +00 11 31    94.977   95.557  124.8    0.5   256   18.6 
2025-08-25 00:00 UT   01 49 11.9   +00 11 41    94.963   95.557  125.7    0.5   257   18.6 
2025-08-26 00:00 UT   01 49 10.7   +00 11 52    94.950   95.556  126.7    0.5   257   18.6 
2025-08-27 00:00 UT   01 49 09.5   +00 12 02    94.936   95.556  127.6    0.5   257   18.6 
2025-08-28 00:00 UT   01 49 08.2   +00 12 13    94.923   95.556  128.5    0.5   258   18.6 
2025-08-29 00:00 UT   01 49 07.0   +00 12 24    94.910   95.556  129.5    0.5   258   18.6 
2025-08-30 00:00 UT   01 49 05.6   +00 12 35    94.898   95.555  130.4    0.5   258   18.6 
2025-08-31 00:00 UT   01 49 04.3   +00 12 46    94.885   95.555  131.4    0.5   258   18.6 
2025-09-01 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 

    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.