(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	20 Jul 2025	18.7	95.565 AU	95.528 AU	01h49m	-00°07'	91.8°	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
2025-07-20 00:00 UT   01 49 30.6   +00 07 06    95.528   95.565   91.8    0.6   249   18.7 
2025-07-20 07:01 UT   01 49 30.6   +00 07 07    95.523   95.565   92.1    0.6   249   18.7 
2025-07-21 00:00 UT   01 49 30.7   +00 07 10    95.511   95.565   92.7    0.6   249   18.7 
2025-07-22 00:00 UT   01 49 30.9   +00 07 14    95.494   95.565   93.7    0.6   250   18.7 
2025-07-23 00:00 UT   01 49 30.9   +00 07 19    95.478   95.565   94.6    0.6   250   18.7 
2025-07-24 00:00 UT   01 49 31.0   +00 07 24    95.461   95.564   95.6    0.6   250   18.7 
2025-07-25 00:00 UT   01 49 30.9   +00 07 29    95.444   95.564   96.5    0.6   250   18.7 
2025-07-26 00:00 UT   01 49 30.9   +00 07 35    95.427   95.564   97.4    0.6   250   18.7 
2025-07-27 00:00 UT   01 49 30.8   +00 07 40    95.411   95.564   98.4    0.6   251   18.7 
2025-07-28 00:00 UT   01 49 30.7   +00 07 46    95.394   95.563   99.3    0.6   251   18.7 
2025-07-29 00:00 UT   01 49 30.5   +00 07 52    95.377   95.563  100.3    0.6   251   18.7 
2025-07-30 00:00 UT   01 49 30.3   +00 07 58    95.361   95.563  101.2    0.6   251   18.7 
2025-07-31 00:00 UT   01 49 30.1   +00 08 04    95.344   95.563  102.1    0.6   251   18.7 
2025-08-01 00:00 UT   01 49 29.8   +00 08 11    95.328   95.562  103.1    0.6   251   18.7 
2025-08-02 00:00 UT   01 49 29.5   +00 08 18    95.311   95.562  104.0    0.6   252   18.7 
2025-08-03 00:00 UT   01 49 29.1   +00 08 25    95.295   95.562  105.0    0.6   252   18.7 
2025-08-04 00:00 UT   01 49 28.7   +00 08 32    95.279   95.562  105.9    0.6   252   18.7 
2025-08-05 00:00 UT   01 49 28.3   +00 08 39    95.263   95.561  106.8    0.6   252   18.7 
2025-08-06 00:00 UT   01 49 27.8   +00 08 47    95.247   95.561  107.8    0.6   252   18.7 
2025-08-07 00:00 UT   01 49 27.3   +00 08 55    95.231   95.561  108.7    0.6   253   18.7 
2025-08-08 00:00 UT   01 49 26.8   +00 09 02    95.215   95.561  109.7    0.6   253   18.7 
2025-08-09 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 

    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.