(90377) Sedna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	9 Oct 2025	20.8	82.925 AU	82.245 AU	04h08m	+08°47'	132.7°	0.5°
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
2025-10-09 00:00 UT   04 08 17.5   +08 47 59    82.245   82.925  132.7    0.5   270   20.8 
2025-10-09 21:28 UT   04 08 16.1   +08 47 50    82.234   82.924  133.5    0.5   271   20.8 
2025-10-10 00:00 UT   04 08 16.0   +08 47 48    82.232   82.924  133.6    0.5   271   20.8 
2025-10-11 00:00 UT   04 08 14.4   +08 47 38    82.220   82.923  134.6    0.5   271   20.8 
2025-10-12 00:00 UT   04 08 12.8   +08 47 27    82.208   82.923  135.5    0.5   271   20.8 
2025-10-13 00:00 UT   04 08 11.1   +08 47 16    82.196   82.922  136.5    0.5   272   20.8 
2025-10-14 00:00 UT   04 08 09.4   +08 47 06    82.184   82.921  137.4    0.5   272   20.8 
2025-10-15 00:00 UT   04 08 07.7   +08 46 55    82.173   82.921  138.4    0.5   273   20.8 
2025-10-16 00:00 UT   04 08 06.0   +08 46 44    82.162   82.920  139.3    0.4   273   20.7 
2025-10-17 00:00 UT   04 08 04.2   +08 46 34    82.151   82.919  140.3    0.4   274   20.7 
2025-10-18 00:00 UT   04 08 02.4   +08 46 23    82.140   82.918  141.2    0.4   274   20.7 
2025-10-19 00:00 UT   04 08 00.5   +08 46 13    82.129   82.918  142.1    0.4   275   20.7 
2025-10-20 00:00 UT   04 07 58.6   +08 46 02    82.119   82.917  143.1    0.4   275   20.7 
2025-10-21 00:00 UT   04 07 56.7   +08 45 52    82.109   82.916  144.0    0.4   276   20.7 
2025-10-22 00:00 UT   04 07 54.8   +08 45 41    82.099   82.916  145.0    0.4   277   20.7 
2025-10-23 00:00 UT   04 07 52.8   +08 45 31    82.089   82.915  145.9    0.4   277   20.7 
2025-10-24 00:00 UT   04 07 50.8   +08 45 21    82.080   82.914  146.8    0.4   278   20.7 
2025-10-25 00:00 UT   04 07 48.8   +08 45 11    82.071   82.914  147.8    0.4   279   20.7 
2025-10-26 00:00 UT   04 07 46.7   +08 45 00    82.062   82.913  148.7    0.4   279   20.7 
2025-10-27 00:00 UT   04 07 44.6   +08 44 50    82.054   82.912  149.6    0.3   280   20.7 
2025-10-28 00:00 UT   04 07 42.5   +08 44 40    82.045   82.911  150.5    0.3   281   20.7 
2025-10-29 00:00 UT   04 07 40.4   +08 44 30    82.037   82.911  151.4    0.3   282   20.7 
2025-10-30 00:00 UT   04 07 38.2   +08 44 20    82.030   82.910  152.3    0.3   283   20.7 
2025-10-31 00:00 UT   04 07 36.0   +08 44 10    82.022   82.909  153.2    0.3   284   20.7 
2025-11-01 00:00 UT   04 07 33.8   +08 44 01    82.015   82.909  154.1    0.3   285   20.7 
2025-11-02 00:00 UT   04 07 31.6   +08 43 51    82.008   82.908  155.0    0.3   286   20.7 
2025-11-03 00:00 UT   04 07 29.3   +08 43 41    82.001   82.907  155.9    0.3   287   20.7 
2025-11-04 00:00 UT   04 07 27.1   +08 43 32    81.995   82.907  156.8    0.3   289   20.7 
2025-11-05 00:00 UT   04 07 24.8   +08 43 22    81.989   82.906  157.6    0.3   290   20.7 
2025-11-06 00:00 UT   04 07 22.5   +08 43 13    81.983   82.905  158.4    0.3   291   20.7 
2025-11-07 00:00 UT   04 07 20.2   +08 43 04    81.977   82.904  159.3    0.2   293   20.7 
2025-11-08 00:00 UT   04 07 17.8   +08 42 55    81.972   82.904  160.1    0.2   295   20.7 

    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.