(90377) Sedna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	8 Aug 2025	20.8	82.968 AU	83.244 AU	04h08m	+08°56'	73.9°	0.7°
Opposition	23 Nov 2025	20.7	82.893 AU	81.927 AU	04h06m	+08°40'	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)                : 0.8618240
            a (Semimajor axis)              : 551.9180231
            i (Inclination)                 : 11.92676
            Ω (Longitude of ascending node) : 144.44087
            ω (Argument of perihelion)      : 310.93869
            M (Mean anomaly)                : 358.60498
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 95.99940
            B (Latitude of perihelion)      : -8.98142
            P (Orbital period in years)     : 12966.17            
        

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
2025-08-08 00:00 UT   04 08 27.4   +08 56 48    83.244   82.968   73.9    0.7   256   20.8 
2025-08-08 08:18 UT   04 08 27.8   +08 56 47    83.238   82.968   74.2    0.7   256   20.8 
2025-08-09 00:00 UT   04 08 28.6   +08 56 43    83.228   82.968   74.8    0.7   256   20.8 
2025-08-10 00:00 UT   04 08 29.8   +08 56 39    83.211   82.967   75.8    0.7   256   20.8 
2025-08-11 00:00 UT   04 08 31.0   +08 56 34    83.194   82.966   76.7    0.7   256   20.8 
2025-08-12 00:00 UT   04 08 32.1   +08 56 28    83.177   82.965   77.6    0.7   256   20.8 
2025-08-13 00:00 UT   04 08 33.2   +08 56 23    83.160   82.965   78.6    0.7   257   20.8 
2025-08-14 00:00 UT   04 08 34.2   +08 56 18    83.143   82.964   79.5    0.7   257   20.8 
2025-08-15 00:00 UT   04 08 35.2   +08 56 12    83.126   82.963   80.4    0.7   257   20.8 
2025-08-16 00:00 UT   04 08 36.2   +08 56 06    83.109   82.963   81.4    0.7   257   20.8 
2025-08-17 00:00 UT   04 08 37.0   +08 56 00    83.092   82.962   82.3    0.7   257   20.8 
2025-08-18 00:00 UT   04 08 37.9   +08 55 54    83.075   82.961   83.2    0.7   258   20.8 
2025-08-19 00:00 UT   04 08 38.7   +08 55 48    83.057   82.961   84.2    0.7   258   20.8 
2025-08-20 00:00 UT   04 08 39.4   +08 55 41    83.040   82.960   85.1    0.7   258   20.8 
2025-08-21 00:00 UT   04 08 40.1   +08 55 35    83.023   82.959   86.1    0.7   258   20.8 
2025-08-22 00:00 UT   04 08 40.8   +08 55 28    83.006   82.958   87.0    0.7   258   20.8 
2025-08-23 00:00 UT   04 08 41.4   +08 55 21    82.988   82.958   87.9    0.7   259   20.8 
2025-08-24 00:00 UT   04 08 42.0   +08 55 14    82.971   82.957   88.9    0.7   259   20.8 
2025-08-25 00:00 UT   04 08 42.5   +08 55 07    82.954   82.956   89.8    0.7   259   20.8 
2025-08-26 00:00 UT   04 08 43.0   +08 54 59    82.936   82.956   90.8    0.7   259   20.8 
2025-08-27 00:00 UT   04 08 43.4   +08 54 52    82.919   82.955   91.7    0.7   259   20.8 
2025-08-28 00:00 UT   04 08 43.7   +08 54 44    82.902   82.954   92.7    0.7   260   20.8 
2025-08-29 00:00 UT   04 08 44.1   +08 54 36    82.884   82.954   93.6    0.7   260   20.8 
2025-08-30 00:00 UT   04 08 44.3   +08 54 28    82.867   82.953   94.5    0.7   260   20.8 
2025-08-31 00:00 UT   04 08 44.6   +08 54 20    82.850   82.952   95.5    0.7   260   20.8 
2025-09-01 00:00 UT   04 08 44.8   +08 54 12    82.833   82.951   96.4    0.7   260   20.8 
2025-09-02 00:00 UT   04 08 44.9   +08 54 04    82.815   82.951   97.4    0.7   261   20.8 
2025-09-03 00:00 UT   04 08 45.0   +08 53 56    82.798   82.950   98.3    0.7   261   20.8 
2025-09-04 00:00 UT   04 08 45.0   +08 53 47    82.781   82.949   99.3    0.7   261   20.8 
2025-09-05 00:00 UT   04 08 45.0   +08 53 39    82.764   82.949  100.2    0.7   261   20.8 
2025-09-06 00:00 UT   04 08 44.9   +08 53 30    82.747   82.948  101.2    0.7   261   20.8 
2025-09-07 00:00 UT   04 08 44.8   +08 53 21    82.730   82.947  102.1    0.7   262   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.