(90377) Sedna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	4 Sep 2026	20.8	82.655 AU	82.504 AU	04h11m	+09°03'	98.3°	0.7°
Opposition	24 Nov 2026	20.7	82.599 AU	81.633 AU	04h09m	+08°50'	168.0°	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 Sedna are:

            e (Eccentricity)                : 0.8598761
            a (Semimajor axis)              : 543.6944589
            i (Inclination)                 : 11.92528
            Ω (Longitude of ascending node) : 144.50604
            ω (Argument of perihelion)      : 311.09892
            M (Mean anomaly)                : 358.59560
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 96.22509
            B (Latitude of perihelion)      : -8.95831
            P (Orbital period in years)     : 12677.46            
        

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
2026-09-04 00:00 UT   04 11 36.7   +09 03 08    82.504   82.655   98.3    0.7   261   20.8 
2026-09-04 01:41 UT   04 11 36.7   +09 03 07    82.503   82.655   98.4    0.7   261   20.8 
2026-09-05 00:00 UT   04 11 36.7   +09 02 59    82.487   82.654   99.3    0.7   261   20.8 
2026-09-06 00:00 UT   04 11 36.7   +09 02 51    82.470   82.654  100.2    0.7   261   20.8 
2026-09-07 00:00 UT   04 11 36.7   +09 02 42    82.453   82.653  101.2    0.7   262   20.8 
2026-09-08 00:00 UT   04 11 36.6   +09 02 33    82.436   82.652  102.1    0.7   262   20.8 
2026-09-09 00:00 UT   04 11 36.4   +09 02 24    82.419   82.652  103.1    0.7   262   20.8 
2026-09-10 00:00 UT   04 11 36.2   +09 02 15    82.402   82.651  104.0    0.7   262   20.8 
2026-09-11 00:00 UT   04 11 36.0   +09 02 06    82.385   82.650  105.0    0.7   263   20.8 
2026-09-12 00:00 UT   04 11 35.7   +09 01 57    82.368   82.650  105.9    0.7   263   20.8 
2026-09-13 00:00 UT   04 11 35.3   +09 01 48    82.352   82.649  106.9    0.7   263   20.8 
2026-09-14 00:00 UT   04 11 34.9   +09 01 38    82.335   82.648  107.8    0.7   263   20.8 
2026-09-15 00:00 UT   04 11 34.5   +09 01 29    82.319   82.648  108.8    0.7   263   20.8 
2026-09-16 00:00 UT   04 11 34.0   +09 01 19    82.303   82.647  109.7    0.7   264   20.8 
2026-09-17 00:00 UT   04 11 33.5   +09 01 10    82.286   82.646  110.7    0.7   264   20.8 
2026-09-18 00:00 UT   04 11 32.9   +09 00 60    82.270   82.646  111.6    0.6   264   20.8 
2026-09-19 00:00 UT   04 11 32.3   +09 00 50    82.254   82.645  112.6    0.6   264   20.8 
2026-09-20 00:00 UT   04 11 31.6   +09 00 40    82.238   82.644  113.5    0.6   265   20.8 
2026-09-21 00:00 UT   04 11 30.9   +09 00 30    82.222   82.643  114.5    0.6   265   20.8 
2026-09-22 00:00 UT   04 11 30.1   +09 00 20    82.207   82.643  115.4    0.6   265   20.8 
2026-09-23 00:00 UT   04 11 29.3   +09 00 10    82.191   82.642  116.4    0.6   265   20.8 
2026-09-24 00:00 UT   04 11 28.4   +08 59 60    82.176   82.641  117.4    0.6   266   20.8 
2026-09-25 00:00 UT   04 11 27.6   +08 59 50    82.161   82.641  118.3    0.6   266   20.8 
2026-09-26 00:00 UT   04 11 26.6   +08 59 40    82.145   82.640  119.3    0.6   266   20.8 
2026-09-27 00:00 UT   04 11 25.6   +08 59 29    82.130   82.639  120.2    0.6   266   20.8 
2026-09-28 00:00 UT   04 11 24.6   +08 59 19    82.116   82.639  121.2    0.6   267   20.8 
2026-09-29 00:00 UT   04 11 23.5   +08 59 09    82.101   82.638  122.1    0.6   267   20.8 
2026-09-30 00:00 UT   04 11 22.4   +08 58 58    82.086   82.637  123.1    0.6   267   20.8 
2026-10-01 00:00 UT   04 11 21.3   +08 58 48    82.072   82.637  124.1    0.6   267   20.8 
2026-10-02 00:00 UT   04 11 20.1   +08 58 37    82.058   82.636  125.0    0.6   268   20.8 
2026-10-03 00:00 UT   04 11 18.8   +08 58 27    82.044   82.635  126.0    0.6   268   20.8 
2026-10-04 00:00 UT   04 11 17.6   +08 58 16    82.030   82.634  126.9    0.6   268   20.8 

    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.