(90377) Sedna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	18 Jun 2025	20.8	83.004 AU	83.902 AU	04h06m	+08°56'	27.7°	0.3°
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
2025-06-18 00:00 UT   04 06 33.9   +08 56 38    83.902   83.004   27.7    0.3   236   20.8 
2025-06-18 08:25 UT   04 06 35.0   +08 56 40    83.900   83.004   28.0    0.3   236   20.8 
2025-06-19 00:00 UT   04 06 36.9   +08 56 43    83.895   83.003   28.6    0.3   237   20.8 
2025-06-20 00:00 UT   04 06 39.8   +08 56 48    83.887   83.003   29.4    0.3   237   20.8 
2025-06-21 00:00 UT   04 06 42.7   +08 56 53    83.878   83.002   30.3    0.4   238   20.8 
2025-06-22 00:00 UT   04 06 45.6   +08 56 57    83.870   83.001   31.2    0.4   239   20.8 
2025-06-23 00:00 UT   04 06 48.4   +08 57 01    83.861   83.001   32.0    0.4   240   20.8 
2025-06-24 00:00 UT   04 06 51.3   +08 57 06    83.852   83.000   32.9    0.4   240   20.8 
2025-06-25 00:00 UT   04 06 54.1   +08 57 09    83.842   82.999   33.8    0.4   241   20.8 
2025-06-26 00:00 UT   04 06 56.9   +08 57 13    83.833   82.999   34.7    0.4   241   20.8 
2025-06-27 00:00 UT   04 06 59.7   +08 57 17    83.823   82.998   35.5    0.4   242   20.8 
2025-06-28 00:00 UT   04 07 02.4   +08 57 20    83.813   82.997   36.4    0.4   243   20.8 
2025-06-29 00:00 UT   04 07 05.1   +08 57 23    83.803   82.996   37.3    0.4   243   20.8 
2025-06-30 00:00 UT   04 07 07.8   +08 57 26    83.793   82.996   38.2    0.4   244   20.8 
2025-07-01 00:00 UT   04 07 10.5   +08 57 29    83.782   82.995   39.1    0.4   244   20.8 
2025-07-02 00:00 UT   04 07 13.1   +08 57 31    83.771   82.994   40.0    0.5   245   20.8 
2025-07-03 00:00 UT   04 07 15.7   +08 57 33    83.760   82.994   40.9    0.5   245   20.8 
2025-07-04 00:00 UT   04 07 18.3   +08 57 35    83.749   82.993   41.8    0.5   245   20.8 
2025-07-05 00:00 UT   04 07 20.9   +08 57 37    83.737   82.992   42.7    0.5   246   20.8 
2025-07-06 00:00 UT   04 07 23.4   +08 57 39    83.725   82.991   43.6    0.5   246   20.8 
2025-07-07 00:00 UT   04 07 25.9   +08 57 41    83.713   82.991   44.5    0.5   247   20.8 
2025-07-08 00:00 UT   04 07 28.4   +08 57 42    83.701   82.990   45.4    0.5   247   20.8 
2025-07-09 00:00 UT   04 07 30.8   +08 57 43    83.689   82.989   46.3    0.5   248   20.8 
2025-07-10 00:00 UT   04 07 33.3   +08 57 44    83.676   82.989   47.2    0.5   248   20.8 
2025-07-11 00:00 UT   04 07 35.6   +08 57 45    83.664   82.988   48.1    0.5   248   20.8 
2025-07-12 00:00 UT   04 07 38.0   +08 57 45    83.651   82.987   49.0    0.5   249   20.8 
2025-07-13 00:00 UT   04 07 40.3   +08 57 46    83.638   82.987   49.9    0.5   249   20.8 
2025-07-14 00:00 UT   04 07 42.6   +08 57 46    83.624   82.986   50.8    0.5   249   20.8 
2025-07-15 00:00 UT   04 07 44.8   +08 57 46    83.611   82.985   51.7    0.6   250   20.8 
2025-07-16 00:00 UT   04 07 47.0   +08 57 46    83.597   82.984   52.7    0.6   250   20.8 
2025-07-17 00:00 UT   04 07 49.2   +08 57 45    83.584   82.984   53.6    0.6   250   20.8 
2025-07-18 00:00 UT   04 07 51.4   +08 57 45    83.570   82.983   54.5    0.6   250   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.