(90377) Sedna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	13 Mar 2025	20.8	83.073 AU	83.433 AU	04h02m	+08°38'	68.4°	0.6°
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
2025-03-13 00:00 UT   04 02 15.7   +08 38 56    83.433   83.073   68.4    0.6    83   20.8 
2025-03-13 17:17 UT   04 02 16.7   +08 39 05    83.444   83.072   67.7    0.6    83   20.8 
2025-03-14 00:00 UT   04 02 17.0   +08 39 09    83.448   83.072   67.5    0.6    83   20.8 
2025-03-15 00:00 UT   04 02 18.4   +08 39 21    83.463   83.071   66.5    0.6    84   20.8 
2025-03-16 00:00 UT   04 02 19.8   +08 39 34    83.478   83.070   65.5    0.6    84   20.8 
2025-03-17 00:00 UT   04 02 21.3   +08 39 46    83.493   83.070   64.6    0.6    84   20.8 
2025-03-18 00:00 UT   04 02 22.8   +08 39 59    83.507   83.069   63.6    0.6    84   20.8 
2025-03-19 00:00 UT   04 02 24.4   +08 40 12    83.522   83.068   62.6    0.6    85   20.8 
2025-03-20 00:00 UT   04 02 26.0   +08 40 25    83.536   83.068   61.7    0.6    85   20.8 
2025-03-21 00:00 UT   04 02 27.6   +08 40 38    83.550   83.067   60.7    0.6    85   20.8 
2025-03-22 00:00 UT   04 02 29.3   +08 40 51    83.564   83.066   59.8    0.6    85   20.8 
2025-03-23 00:00 UT   04 02 31.0   +08 41 04    83.578   83.066   58.8    0.6    86   20.8 
2025-03-24 00:00 UT   04 02 32.8   +08 41 17    83.591   83.065   57.8    0.6    86   20.8 
2025-03-25 00:00 UT   04 02 34.6   +08 41 30    83.605   83.064   56.9    0.6    86   20.8 
2025-03-26 00:00 UT   04 02 36.5   +08 41 43    83.618   83.063   55.9    0.6    87   20.8 
2025-03-27 00:00 UT   04 02 38.4   +08 41 56    83.631   83.063   55.0    0.6    87   20.8 
2025-03-28 00:00 UT   04 02 40.3   +08 42 09    83.644   83.062   54.0    0.6    87   20.8 
2025-03-29 00:00 UT   04 02 42.3   +08 42 22    83.657   83.061   53.1    0.6    88   20.8 
2025-03-30 00:00 UT   04 02 44.3   +08 42 35    83.670   83.061   52.1    0.5    88   20.8 
2025-03-31 00:00 UT   04 02 46.3   +08 42 49    83.683   83.060   51.2    0.5    88   20.8 
2025-04-01 00:00 UT   04 02 48.4   +08 43 02    83.695   83.059   50.3    0.5    89   20.8 
2025-04-02 00:00 UT   04 02 50.5   +08 43 15    83.707   83.058   49.3    0.5    89   20.8 
2025-04-03 00:00 UT   04 02 52.7   +08 43 28    83.719   83.058   48.4    0.5    89   20.8 
2025-04-04 00:00 UT   04 02 54.9   +08 43 42    83.731   83.057   47.4    0.5    90   20.8 
2025-04-05 00:00 UT   04 02 57.1   +08 43 55    83.742   83.056   46.5    0.5    90   20.8 
2025-04-06 00:00 UT   04 02 59.4   +08 44 08    83.753   83.056   45.6    0.5    90   20.8 
2025-04-07 00:00 UT   04 03 01.7   +08 44 21    83.765   83.055   44.6    0.5    91   20.8 
2025-04-08 00:00 UT   04 03 04.0   +08 44 35    83.776   83.054   43.7    0.5    91   20.8 
2025-04-09 00:00 UT   04 03 06.4   +08 44 48    83.786   83.053   42.8    0.5    92   20.8 
2025-04-10 00:00 UT   04 03 08.8   +08 45 01    83.797   83.053   41.8    0.5    92   20.8 
2025-04-11 00:00 UT   04 03 11.2   +08 45 14    83.807   83.052   40.9    0.5    92   20.8 
2025-04-12 00:00 UT   04 03 13.7   +08 45 27    83.817   83.051   40.0    0.4    93   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.