(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	19 Dec 2024	18.7	95.616 AU	95.176 AU	01h45m	-00°43'	116.3°	0.5°
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
2024-12-19 00:00 UT   01 45 02.6   +00 43 30    95.176   95.616  116.3    0.5    63   18.7 
2024-12-19 00:09 UT   01 45 02.6   +00 43 30    95.176   95.616  116.3    0.5    63   18.7 
2024-12-20 00:00 UT   01 45 01.5   +00 43 27    95.191   95.616  115.4    0.5    64   18.7 
2024-12-21 00:00 UT   01 45 00.4   +00 43 24    95.206   95.616  114.4    0.5    64   18.7 
2024-12-22 00:00 UT   01 44 59.4   +00 43 21    95.222   95.616  113.4    0.5    64   18.7 
2024-12-23 00:00 UT   01 44 58.4   +00 43 18    95.237   95.615  112.4    0.5    64   18.7 
2024-12-24 00:00 UT   01 44 57.4   +00 43 15    95.253   95.615  111.3    0.5    64   18.7 
2024-12-25 00:00 UT   01 44 56.5   +00 43 11    95.269   95.615  110.3    0.6    65   18.7 
2024-12-26 00:00 UT   01 44 55.6   +00 43 07    95.285   95.615  109.3    0.6    65   18.7 
2024-12-27 00:00 UT   01 44 54.8   +00 43 02    95.301   95.614  108.3    0.6    65   18.7 
2024-12-28 00:00 UT   01 44 54.0   +00 42 58    95.317   95.614  107.3    0.6    65   18.7 
2024-12-29 00:00 UT   01 44 53.2   +00 42 53    95.333   95.614  106.3    0.6    66   18.7 
2024-12-30 00:00 UT   01 44 52.5   +00 42 48    95.349   95.614  105.3    0.6    66   18.7 
2024-12-31 00:00 UT   01 44 51.8   +00 42 42    95.365   95.614  104.3    0.6    66   18.7 
2025-01-01 00:00 UT   01 44 51.1   +00 42 37    95.382   95.613  103.3    0.6    66   18.7 
2025-01-02 00:00 UT   01 44 50.5   +00 42 31    95.398   95.613  102.3    0.6    66   18.7 
2025-01-03 00:00 UT   01 44 50.0   +00 42 25    95.415   95.613  101.3    0.6    67   18.7 
2025-01-04 00:00 UT   01 44 49.4   +00 42 18    95.432   95.613  100.3    0.6    67   18.7 
2025-01-05 00:00 UT   01 44 48.9   +00 42 11    95.448   95.612   99.3    0.6    67   18.7 
2025-01-06 00:00 UT   01 44 48.5   +00 42 05    95.465   95.612   98.3    0.6    67   18.7 
2025-01-07 00:00 UT   01 44 48.1   +00 41 57    95.482   95.612   97.3    0.6    67   18.7 
2025-01-08 00:00 UT   01 44 47.7   +00 41 50    95.499   95.612   96.3    0.6    67   18.7 
2025-01-09 00:00 UT   01 44 47.4   +00 41 42    95.515   95.611   95.3    0.6    68   18.7 
2025-01-10 00:00 UT   01 44 47.1   +00 41 34    95.532   95.611   94.3    0.6    68   18.7 
2025-01-11 00:00 UT   01 44 46.8   +00 41 26    95.549   95.611   93.3    0.6    68   18.7 
2025-01-12 00:00 UT   01 44 46.6   +00 41 18    95.566   95.611   92.3    0.6    68   18.7 
2025-01-13 00:00 UT   01 44 46.4   +00 41 09    95.583   95.610   91.3    0.6    68   18.7 
2025-01-14 00:00 UT   01 44 46.3   +00 41 00    95.600   95.610   90.3    0.6    69   18.7 
2025-01-15 00:00 UT   01 44 46.2   +00 40 51    95.617   95.610   89.3    0.6    69   18.7 
2025-01-16 00:00 UT   01 44 46.2   +00 40 42    95.634   95.610   88.3    0.6    69   18.7 
2025-01-17 00:00 UT   01 44 46.2   +00 40 32    95.651   95.610   87.3    0.6    69   18.7 
2025-01-18 00:00 UT   01 44 46.2   +00 40 22    95.668   95.609   86.3    0.6    69   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.