(90377) Sedna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	15 Apr 2025	20.8	83.049 AU	83.846 AU	04h03m	+08°46'	37.2°	0.4°
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
2025-04-15 00:00 UT   04 03 21.3   +08 46 07    83.846   83.049   37.2    0.4    94   20.8 
2025-04-15 06:41 UT   04 03 22.0   +08 46 10    83.848   83.049   37.0    0.4    95   20.8 
2025-04-16 00:00 UT   04 03 23.9   +08 46 20    83.855   83.049   36.3    0.4    95   20.8 
2025-04-17 00:00 UT   04 03 26.5   +08 46 33    83.864   83.048   35.4    0.4    96   20.8 
2025-04-18 00:00 UT   04 03 29.1   +08 46 46    83.873   83.047   34.5    0.4    96   20.8 
2025-04-19 00:00 UT   04 03 31.8   +08 46 59    83.881   83.046   33.6    0.4    97   20.8 
2025-04-20 00:00 UT   04 03 34.5   +08 47 11    83.889   83.046   32.7    0.4    97   20.8 
2025-04-21 00:00 UT   04 03 37.2   +08 47 24    83.897   83.045   31.8    0.4    98   20.8 
2025-04-22 00:00 UT   04 03 40.0   +08 47 37    83.905   83.044   31.0    0.4    99   20.8 
2025-04-23 00:00 UT   04 03 42.7   +08 47 50    83.913   83.044   30.1    0.3   100   20.8 
2025-04-24 00:00 UT   04 03 45.5   +08 48 02    83.920   83.043   29.2    0.3   100   20.8 
2025-04-25 00:00 UT   04 03 48.3   +08 48 15    83.927   83.042   28.3    0.3   101   20.8 
2025-04-26 00:00 UT   04 03 51.2   +08 48 27    83.933   83.041   27.5    0.3   102   20.8 
2025-04-27 00:00 UT   04 03 54.0   +08 48 40    83.940   83.041   26.6    0.3   103   20.8 
2025-04-28 00:00 UT   04 03 56.9   +08 48 52    83.946   83.040   25.7    0.3   104   20.8 
2025-04-29 00:00 UT   04 03 59.8   +08 49 04    83.952   83.039   24.9    0.3   105   20.8 
2025-04-30 00:00 UT   04 04 02.7   +08 49 16    83.958   83.039   24.1    0.3   106   20.8 
2025-05-01 00:00 UT   04 04 05.7   +08 49 29    83.963   83.038   23.2    0.3   108   20.8 
2025-05-02 00:00 UT   04 04 08.6   +08 49 41    83.968   83.037   22.4    0.3   109   20.8 
2025-05-03 00:00 UT   04 04 11.6   +08 49 52    83.973   83.037   21.6    0.3   110   20.8 
2025-05-04 00:00 UT   04 04 14.6   +08 50 04    83.978   83.036   20.8    0.2   112   20.8 
2025-05-05 00:00 UT   04 04 17.6   +08 50 16    83.982   83.035   20.0    0.2   113   20.8 
2025-05-06 00:00 UT   04 04 20.6   +08 50 28    83.986   83.034   19.3    0.2   115   20.8 
2025-05-07 00:00 UT   04 04 23.7   +08 50 39    83.990   83.034   18.5    0.2   117   20.8 
2025-05-08 00:00 UT   04 04 26.7   +08 50 50    83.994   83.033   17.8    0.2   119   20.8 
2025-05-09 00:00 UT   04 04 29.8   +08 51 02    83.997   83.032   17.1    0.2   121   20.8 
2025-05-10 00:00 UT   04 04 32.8   +08 51 13    84.000   83.032   16.4    0.2   123   20.8 
2025-05-11 00:00 UT   04 04 35.9   +08 51 24    84.003   83.031   15.8    0.2   126   20.8 
2025-05-12 00:00 UT   04 04 39.0   +08 51 35    84.005   83.030   15.2    0.2   129   20.8 
2025-05-13 00:00 UT   04 04 42.1   +08 51 46    84.007   83.030   14.6    0.2   132   20.8 
2025-05-14 00:00 UT   04 04 45.2   +08 51 56    84.009   83.029   14.0    0.2   135   20.8 
2025-05-15 00:00 UT   04 04 48.3   +08 52 07    84.011   83.028   13.5    0.2   138   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.