(136199) Eris
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	9 Oct 2026	18.6	95.456 AU	94.488 AU	01h48m	-00°04'	165.7°	0.1°
Opposition	18 Oct 2026	18.6	95.454 AU	94.474 AU	01h48m	-00°06'	169.5°	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)                : 0.4382358
            a (Semimajor axis)              : 67.9347834
            i (Inclination)                 : 43.92595
            Ω (Longitude of ascending node) : 36.00471
            ω (Argument of perihelion)      : 150.79222
            M (Mean anomaly)                : 211.78033
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 14.07227
            B (Latitude of perihelion)      : 19.78698
            P (Orbital period in years)     : 559.94            
        

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.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-10-09 00:00 UT   01 48 23.5   +00 04 37    94.488   95.456  165.7    0.1   296   18.6 
2026-10-09 16:53 UT   01 48 22.0   +00 04 45    94.486   95.456  166.2    0.1   298   18.6 
2026-10-10 00:00 UT   01 48 21.3   +00 04 48    94.485   95.456  166.3    0.1   299   18.6 
2026-10-11 00:00 UT   01 48 19.1   +00 05 00    94.483   95.456  167.0    0.1   302   18.6 
2026-10-12 00:00 UT   01 48 16.9   +00 05 12    94.481   95.455  167.5    0.1   306   18.6 
2026-10-13 00:00 UT   01 48 14.7   +00 05 23    94.479   95.455  168.0    0.1   310   18.6 
2026-10-14 00:00 UT   01 48 12.4   +00 05 35    94.477   95.455  168.5    0.1   314   18.6 
2026-10-15 00:00 UT   01 48 10.2   +00 05 46    94.476   95.455  168.8    0.1   319   18.6 
2026-10-16 00:00 UT   01 48 07.9   +00 05 57    94.475   95.454  169.1    0.1   324   18.6 
2026-10-17 00:00 UT   01 48 05.7   +00 06 08    94.475   95.454  169.3    0.1   329   18.6 
2026-10-18 00:00 UT   01 48 03.4   +00 06 19    94.474   95.454  169.5    0.1   335   18.6 
2026-10-19 00:00 UT   01 48 01.2   +00 06 30    94.474   95.454  169.5    0.1   340   18.6 
2026-10-20 00:00 UT   01 47 58.9   +00 06 41    94.474   95.453  169.4    0.1   346   18.6 
2026-10-21 00:00 UT   01 47 56.6   +00 06 51    94.475   95.453  169.3    0.1   351   18.6 
2026-10-22 00:00 UT   01 47 54.4   +00 07 02    94.476   95.453  169.0    0.1   356   18.6 
2026-10-23 00:00 UT   01 47 52.1   +00 07 12    94.477   95.453  168.7    0.1     1   18.6 
2026-10-24 00:00 UT   01 47 49.8   +00 07 23    94.478   95.452  168.3    0.1     6   18.6 
2026-10-25 00:00 UT   01 47 47.6   +00 07 33    94.480   95.452  167.8    0.1    10   18.6 
2026-10-26 00:00 UT   01 47 45.3   +00 07 43    94.482   95.452  167.3    0.1    14   18.6 
2026-10-27 00:00 UT   01 47 43.0   +00 07 53    94.484   95.452  166.7    0.1    17   18.6 
2026-10-28 00:00 UT   01 47 40.8   +00 08 02    94.487   95.451  166.0    0.1    21   18.6 
2026-10-29 00:00 UT   01 47 38.5   +00 08 12    94.490   95.451  165.3    0.2    24   18.6 
2026-10-30 00:00 UT   01 47 36.3   +00 08 21    94.493   95.451  164.6    0.2    26   18.6 
2026-10-31 00:00 UT   01 47 34.0   +00 08 31    94.497   95.451  163.9    0.2    29   18.6 
2026-11-01 00:00 UT   01 47 31.8   +00 08 40    94.500   95.450  163.1    0.2    31   18.6 
2026-11-02 00:00 UT   01 47 29.6   +00 08 49    94.504   95.450  162.3    0.2    33   18.6 
2026-11-03 00:00 UT   01 47 27.3   +00 08 58    94.509   95.450  161.5    0.2    35   18.6 
2026-11-04 00:00 UT   01 47 25.1   +00 09 06    94.513   95.450  160.7    0.2    37   18.6 
2026-11-05 00:00 UT   01 47 22.9   +00 09 15    94.518   95.449  159.8    0.2    39   18.6 
2026-11-06 00:00 UT   01 47 20.7   +00 09 23    94.523   95.449  158.9    0.2    40   18.6 
2026-11-07 00:00 UT   01 47 18.5   +00 09 31    94.529   95.449  158.1    0.2    41   18.6 
2026-11-08 00:00 UT   01 47 16.3   +00 09 39    94.535   95.449  157.2    0.2    43   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.