(90377) Sedna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	7 May 2025	20.8	83.034 AU	83.990 AU	04h04m	+08°50'	18.5°	0.2°
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
2025-05-07 00:00 UT   04 04 23.7   +08 50 39    83.990   83.034   18.5    0.2   117   20.8 
2025-05-07 02:18 UT   04 04 24.0   +08 50 40    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 
2025-05-16 00:00 UT   04 04 51.5   +08 52 17    84.012   83.027   13.1    0.2   142   20.8 
2025-05-17 00:00 UT   04 04 54.6   +08 52 28    84.013   83.027   12.7    0.2   146   20.8 
2025-05-18 00:00 UT   04 04 57.8   +08 52 38    84.014   83.026   12.4    0.1   150   20.8 
2025-05-19 00:00 UT   04 05 00.9   +08 52 48    84.015   83.025   12.1    0.1   154   20.8 
2025-05-20 00:00 UT   04 05 04.0   +08 52 58    84.015   83.025   11.9    0.1   159   20.8 
2025-05-21 00:00 UT   04 05 07.2   +08 53 08    84.015   83.024   11.8    0.1   163   20.8 
2025-05-22 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 

    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.