(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	18 Jan 2025	18.7	95.609 AU	95.668 AU	01h44m	-00°40'	86.3°	0.6°
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)                : 0.4343064
            a (Semimajor axis)              : 68.1040879
            i (Inclination)                 : 43.77788
            Ω (Longitude of ascending node) : 36.06369
            ω (Argument of perihelion)      : 150.71785
            M (Mean anomaly)                : 210.56666
            Epoch                           : 2024 Oct 17

            L (Longitude of perihelion)     : 14.02130
            B (Latitude of perihelion)      : 19.77932
            P (Orbital period in years)     : 562.03            
        

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
2025-01-18 00:00 UT   01 44 46.2   +00 40 22    95.668   95.609   86.3    0.6    69   18.7 
2025-01-18 06:37 UT   01 44 46.2   +00 40 19    95.672   95.609   86.0    0.6    69   18.7 
2025-01-19 00:00 UT   01 44 46.3   +00 40 12    95.684   95.609   85.3    0.6    70   18.7 
2025-01-20 00:00 UT   01 44 46.4   +00 40 02    95.701   95.609   84.3    0.6    70   18.7 
2025-01-21 00:00 UT   01 44 46.6   +00 39 51    95.718   95.609   83.3    0.6    70   18.7 
2025-01-22 00:00 UT   01 44 46.8   +00 39 41    95.735   95.608   82.3    0.6    70   18.7 
2025-01-23 00:00 UT   01 44 47.0   +00 39 30    95.752   95.608   81.3    0.6    70   18.7 
2025-01-24 00:00 UT   01 44 47.3   +00 39 18    95.768   95.608   80.3    0.6    71   18.7 
2025-01-25 00:00 UT   01 44 47.6   +00 39 07    95.785   95.608   79.3    0.6    71   18.7 
2025-01-26 00:00 UT   01 44 48.0   +00 38 55    95.802   95.607   78.3    0.6    71   18.7 
2025-01-27 00:00 UT   01 44 48.4   +00 38 44    95.818   95.607   77.3    0.6    71   18.7 
2025-01-28 00:00 UT   01 44 48.8   +00 38 32    95.835   95.607   76.3    0.6    71   18.7 
2025-01-29 00:00 UT   01 44 49.3   +00 38 19    95.851   95.607   75.4    0.6    72   18.7 
2025-01-30 00:00 UT   01 44 49.8   +00 38 07    95.867   95.606   74.4    0.6    72   18.7 
2025-01-31 00:00 UT   01 44 50.4   +00 37 54    95.884   95.606   73.4    0.6    72   18.7 
2025-02-01 00:00 UT   01 44 51.0   +00 37 42    95.900   95.606   72.4    0.6    72   18.7 
2025-02-02 00:00 UT   01 44 51.7   +00 37 29    95.916   95.606   71.4    0.6    72   18.7 
2025-02-03 00:00 UT   01 44 52.3   +00 37 16    95.932   95.605   70.4    0.6    73   18.7 
2025-02-04 00:00 UT   01 44 53.1   +00 37 02    95.948   95.605   69.4    0.6    73   18.7 
2025-02-05 00:00 UT   01 44 53.8   +00 36 49    95.963   95.605   68.4    0.5    73   18.7 
2025-02-06 00:00 UT   01 44 54.6   +00 36 35    95.979   95.605   67.4    0.5    73   18.7 
2025-02-07 00:00 UT   01 44 55.5   +00 36 21    95.995   95.605   66.4    0.5    73   18.7 
2025-02-08 00:00 UT   01 44 56.3   +00 36 07    96.010   95.604   65.4    0.5    74   18.7 
2025-02-09 00:00 UT   01 44 57.3   +00 35 53    96.025   95.604   64.5    0.5    74   18.7 
2025-02-10 00:00 UT   01 44 58.2   +00 35 39    96.041   95.604   63.5    0.5    74   18.7 
2025-02-11 00:00 UT   01 44 59.2   +00 35 24    96.056   95.604   62.5    0.5    74   18.7 
2025-02-12 00:00 UT   01 45 00.2   +00 35 09    96.070   95.603   61.5    0.5    75   18.7 
2025-02-13 00:00 UT   01 45 01.3   +00 34 55    96.085   95.603   60.5    0.5    75   18.7 
2025-02-14 00:00 UT   01 45 02.4   +00 34 40    96.100   95.603   59.5    0.5    75   18.7 
2025-02-15 00:00 UT   01 45 03.5   +00 34 25    96.114   95.603   58.6    0.5    75   18.7 
2025-02-16 00:00 UT   01 45 04.7   +00 34 09    96.128   95.602   57.6    0.5    76   18.7 
2025-02-17 00:00 UT   01 45 05.9   +00 33 54    96.143   95.602   56.6    0.5    76   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.