(90377) Sedna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	23 Nov 2025	20.7	82.857 AU	81.891 AU	04h07m	+08°41'	168.0°	0.1°
Today	16 Dec 2025	20.7	82.841 AU	81.953 AU	04h06m	+08°40'	154.5°	0.3°

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)                : 0.8613016
            a (Semimajor axis)              : 549.5546911
            i (Inclination)                 : 11.92592
            Ω (Longitude of ascending node) : 144.47860
            ω (Argument of perihelion)      : 311.01044
            M (Mean anomaly)                : 358.60730
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 96.10900
            B (Latitude of perihelion)      : -8.97095
            P (Orbital period in years)     : 12882.98            
        

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.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-16 00:00 UT   04 06 05.6   +08 40 01    81.953   82.841  154.5    0.3    52   20.7 
2025-12-16 13:24 UT   04 06 04.3   +08 39 59    81.956   82.841  154.0    0.3    53   20.7 
2025-12-17 00:00 UT   04 06 03.3   +08 39 58    81.959   82.841  153.6    0.3    54   20.7 
2025-12-18 00:00 UT   04 06 01.0   +08 39 55    81.965   82.840  152.7    0.3    55   20.7 
2025-12-19 00:00 UT   04 05 58.7   +08 39 52    81.972   82.839  151.7    0.3    56   20.7 
2025-12-20 00:00 UT   04 05 56.5   +08 39 50    81.979   82.839  150.8    0.3    57   20.7 
2025-12-21 00:00 UT   04 05 54.2   +08 39 48    81.986   82.838  149.9    0.3    57   20.7 
2025-12-22 00:00 UT   04 05 52.0   +08 39 46    81.993   82.837  148.9    0.4    58   20.7 
2025-12-23 00:00 UT   04 05 49.8   +08 39 45    82.001   82.837  148.0    0.4    59   20.7 
2025-12-24 00:00 UT   04 05 47.7   +08 39 43    82.009   82.836  147.0    0.4    60   20.7 
2025-12-25 00:00 UT   04 05 45.6   +08 39 42    82.017   82.835  146.1    0.4    60   20.7 
2025-12-26 00:00 UT   04 05 43.4   +08 39 41    82.026   82.834  145.1    0.4    61   20.7 
2025-12-27 00:00 UT   04 05 41.4   +08 39 40    82.035   82.834  144.2    0.4    62   20.7 
2025-12-28 00:00 UT   04 05 39.3   +08 39 39    82.044   82.833  143.2    0.4    62   20.7 
2025-12-29 00:00 UT   04 05 37.3   +08 39 39    82.053   82.832  142.3    0.4    63   20.8 
2025-12-30 00:00 UT   04 05 35.3   +08 39 39    82.062   82.832  141.3    0.4    63   20.8 
2025-12-31 00:00 UT   04 05 33.3   +08 39 39    82.072   82.831  140.3    0.4    64   20.8 
2026-01-01 00:00 UT   04 05 31.4   +08 39 39    82.082   82.830  139.3    0.4    65   20.8 
2026-01-02 00:00 UT   04 05 29.5   +08 39 40    82.092   82.830  138.4    0.5    65   20.8 
2026-01-03 00:00 UT   04 05 27.6   +08 39 40    82.103   82.829  137.4    0.5    65   20.8 
2026-01-04 00:00 UT   04 05 25.8   +08 39 41    82.113   82.828  136.4    0.5    66   20.8 
2026-01-05 00:00 UT   04 05 24.0   +08 39 42    82.124   82.827  135.4    0.5    66   20.8 
2026-01-06 00:00 UT   04 05 22.2   +08 39 44    82.135   82.827  134.5    0.5    67   20.8 
2026-01-07 00:00 UT   04 05 20.5   +08 39 45    82.147   82.826  133.5    0.5    67   20.8 
2026-01-08 00:00 UT   04 05 18.8   +08 39 47    82.158   82.825  132.5    0.5    68   20.8 
2026-01-09 00:00 UT   04 05 17.1   +08 39 49    82.170   82.825  131.5    0.5    68   20.8 
2026-01-10 00:00 UT   04 05 15.5   +08 39 51    82.182   82.824  130.5    0.5    68   20.8 
2026-01-11 00:00 UT   04 05 13.9   +08 39 53    82.194   82.823  129.5    0.5    69   20.8 
2026-01-12 00:00 UT   04 05 12.3   +08 39 56    82.206   82.823  128.5    0.5    69   20.8 
2026-01-13 00:00 UT   04 05 10.8   +08 39 59    82.219   82.822  127.6    0.5    69   20.8 
2026-01-14 00:00 UT   04 05 09.3   +08 40 02    82.232   82.821  126.6    0.5    70   20.8 
2026-01-15 00:00 UT   04 05 07.9   +08 40 05    82.245   82.820  125.6    0.6    70   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.