(90377) Sedna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	21 May 2025	20.8	83.024 AU	84.015 AU	04h05m	+08°53'	11.8°	0.1°
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
2025-05-21 00:00 UT   04 05 07.2   +08 53 08    84.015   83.024   11.8    0.1   163   20.8 
2025-05-21 09:01 UT   04 05 08.4   +08 53 12    84.015   83.024   11.7    0.1   165   20.8 
2025-05-22 00:00 UT   04 05 10.4   +08 53 18    84.014   83.023   11.7    0.1   168   20.8 
2025-05-23 00:00 UT   04 05 13.5   +08 53 27    84.014   83.022   11.7    0.1   172   20.8 
2025-05-24 00:00 UT   04 05 16.7   +08 53 36    84.013   83.022   11.8    0.1   177   20.8 
2025-05-25 00:00 UT   04 05 19.8   +08 53 46    84.012   83.021   12.0    0.1   182   20.8 
2025-05-26 00:00 UT   04 05 23.0   +08 53 55    84.010   83.020   12.2    0.1   186   20.8 
2025-05-27 00:00 UT   04 05 26.2   +08 54 04    84.009   83.020   12.5    0.2   190   20.8 
2025-05-28 00:00 UT   04 05 29.3   +08 54 12    84.007   83.019   12.9    0.2   194   20.8 
2025-05-29 00:00 UT   04 05 32.5   +08 54 21    84.004   83.018   13.3    0.2   198   20.8 
2025-05-30 00:00 UT   04 05 35.6   +08 54 30    84.002   83.018   13.8    0.2   201   20.8 
2025-05-31 00:00 UT   04 05 38.8   +08 54 38    83.999   83.017   14.3    0.2   205   20.8 
2025-06-01 00:00 UT   04 05 41.9   +08 54 46    83.996   83.016   14.9    0.2   208   20.8 
2025-06-02 00:00 UT   04 05 45.1   +08 54 54    83.993   83.015   15.5    0.2   210   20.8 
2025-06-03 00:00 UT   04 05 48.2   +08 55 02    83.989   83.015   16.1    0.2   213   20.8 
2025-06-04 00:00 UT   04 05 51.3   +08 55 09    83.985   83.014   16.8    0.2   215   20.8 
2025-06-05 00:00 UT   04 05 54.4   +08 55 17    83.981   83.013   17.5    0.2   218   20.8 
2025-06-06 00:00 UT   04 05 57.6   +08 55 24    83.976   83.013   18.2    0.2   220   20.8 
2025-06-07 00:00 UT   04 06 00.7   +08 55 31    83.972   83.012   18.9    0.2   222   20.8 
2025-06-08 00:00 UT   04 06 03.7   +08 55 38    83.967   83.011   19.6    0.2   223   20.8 
2025-06-09 00:00 UT   04 06 06.8   +08 55 45    83.961   83.010   20.4    0.2   225   20.8 
2025-06-10 00:00 UT   04 06 09.9   +08 55 52    83.956   83.010   21.2    0.3   226   20.8 
2025-06-11 00:00 UT   04 06 12.9   +08 55 58    83.950   83.009   22.0    0.3   228   20.8 
2025-06-12 00:00 UT   04 06 16.0   +08 56 04    83.944   83.008   22.8    0.3   229   20.8 
2025-06-13 00:00 UT   04 06 19.0   +08 56 11    83.938   83.008   23.6    0.3   230   20.8 
2025-06-14 00:00 UT   04 06 22.0   +08 56 16    83.931   83.007   24.4    0.3   232   20.8 
2025-06-15 00:00 UT   04 06 25.0   +08 56 22    83.924   83.006   25.2    0.3   233   20.8 
2025-06-16 00:00 UT   04 06 28.0   +08 56 28    83.917   83.006   26.0    0.3   234   20.8 
2025-06-17 00:00 UT   04 06 31.0   +08 56 33    83.910   83.005   26.9    0.3   235   20.8 
2025-06-18 00:00 UT   04 06 33.9   +08 56 38    83.902   83.004   27.7    0.3   236   20.8 
2025-06-19 00:00 UT   04 06 36.9   +08 56 43    83.895   83.003   28.6    0.3   237   20.8 
2025-06-20 00:00 UT   04 06 39.8   +08 56 48    83.887   83.003   29.4    0.3   237   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.