(90377) Sedna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	17 Aug 2026	20.8	82.880 AU	83.017 AU	04h09m	+08°58'	81.9°	0.7°
Opposition	23 Nov 2026	20.7	82.811 AU	81.845 AU	04h07m	+08°43'	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)                : 0.8612949
            a (Semimajor axis)              : 549.5301384
            i (Inclination)                 : 11.92592
            Ω (Longitude of ascending node) : 144.47863
            ω (Argument of perihelion)      : 311.00992
            M (Mean anomaly)                : 358.60722
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 96.10851
            B (Latitude of perihelion)      : -8.97102
            P (Orbital period in years)     : 12882.12            
        

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
2026-08-17 00:00 UT   04 09 24.2   +08 58 36    83.017   82.880   81.9    0.7   257   20.8 
2026-08-17 13:53 UT   04 09 24.7   +08 58 33    83.007   82.879   82.4    0.7   258   20.8 
2026-08-18 00:00 UT   04 09 25.1   +08 58 30    83.000   82.879   82.8    0.7   258   20.8 
2026-08-19 00:00 UT   04 09 25.9   +08 58 24    82.983   82.878   83.7    0.7   258   20.8 
2026-08-20 00:00 UT   04 09 26.7   +08 58 18    82.966   82.878   84.7    0.7   258   20.8 
2026-08-21 00:00 UT   04 09 27.4   +08 58 11    82.948   82.877   85.6    0.7   258   20.8 
2026-08-22 00:00 UT   04 09 28.1   +08 58 04    82.931   82.876   86.6    0.7   258   20.8 
2026-08-23 00:00 UT   04 09 28.7   +08 57 58    82.914   82.875   87.5    0.7   259   20.8 
2026-08-24 00:00 UT   04 09 29.3   +08 57 51    82.896   82.875   88.4    0.7   259   20.8 
2026-08-25 00:00 UT   04 09 29.8   +08 57 43    82.879   82.874   89.4    0.7   259   20.8 
2026-08-26 00:00 UT   04 09 30.3   +08 57 36    82.862   82.873   90.3    0.7   259   20.8 
2026-08-27 00:00 UT   04 09 30.8   +08 57 29    82.845   82.873   91.3    0.7   259   20.8 
2026-08-28 00:00 UT   04 09 31.1   +08 57 21    82.827   82.872   92.2    0.7   260   20.8 
2026-08-29 00:00 UT   04 09 31.5   +08 57 13    82.810   82.871   93.2    0.7   260   20.8 
2026-08-30 00:00 UT   04 09 31.8   +08 57 06    82.793   82.871   94.1    0.7   260   20.8 
2026-08-31 00:00 UT   04 09 32.0   +08 56 58    82.775   82.870   95.0    0.7   260   20.8 
2026-09-01 00:00 UT   04 09 32.2   +08 56 50    82.758   82.869   96.0    0.7   260   20.8 
2026-09-02 00:00 UT   04 09 32.4   +08 56 41    82.741   82.868   96.9    0.7   261   20.8 
2026-09-03 00:00 UT   04 09 32.5   +08 56 33    82.724   82.868   97.9    0.7   261   20.8 
2026-09-04 00:00 UT   04 09 32.6   +08 56 25    82.707   82.867   98.8    0.7   261   20.8 
2026-09-05 00:00 UT   04 09 32.6   +08 56 16    82.689   82.866   99.8    0.7   261   20.8 
2026-09-06 00:00 UT   04 09 32.5   +08 56 07    82.672   82.866  100.7    0.7   261   20.8 
2026-09-07 00:00 UT   04 09 32.5   +08 55 59    82.655   82.865  101.7    0.7   262   20.8 
2026-09-08 00:00 UT   04 09 32.3   +08 55 50    82.639   82.864  102.6    0.7   262   20.8 
2026-09-09 00:00 UT   04 09 32.2   +08 55 41    82.622   82.864  103.6    0.7   262   20.8 
2026-09-10 00:00 UT   04 09 31.9   +08 55 32    82.605   82.863  104.5    0.7   262   20.8 
2026-09-11 00:00 UT   04 09 31.7   +08 55 22    82.588   82.862  105.5    0.7   262   20.8 
2026-09-12 00:00 UT   04 09 31.3   +08 55 13    82.571   82.861  106.4    0.7   263   20.8 
2026-09-13 00:00 UT   04 09 31.0   +08 55 04    82.555   82.861  107.4    0.7   263   20.8 
2026-09-14 00:00 UT   04 09 30.6   +08 54 54    82.538   82.860  108.3    0.7   263   20.8 
2026-09-15 00:00 UT   04 09 30.1   +08 54 45    82.522   82.859  109.3    0.7   263   20.8 
2026-09-16 00:00 UT   04 09 29.6   +08 54 35    82.506   82.859  110.2    0.7   264   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.