(90377) Sedna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	16 Sep 2025	20.8	82.941 AU	82.581 AU	04h08m	+08°51'	110.7°	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
2025-09-16 00:00 UT   04 08 41.8   +08 51 57    82.581   82.941  110.7    0.6   264   20.8 
2025-09-16 22:34 UT   04 08 41.2   +08 51 48    82.566   82.940  111.6    0.6   264   20.8 
2025-09-17 00:00 UT   04 08 41.2   +08 51 47    82.565   82.940  111.6    0.6   264   20.8 
2025-09-18 00:00 UT   04 08 40.6   +08 51 38    82.549   82.940  112.6    0.6   264   20.8 
2025-09-19 00:00 UT   04 08 39.9   +08 51 28    82.533   82.939  113.5    0.6   264   20.8 
2025-09-20 00:00 UT   04 08 39.2   +08 51 18    82.517   82.938  114.5    0.6   265   20.8 
2025-09-21 00:00 UT   04 08 38.4   +08 51 08    82.501   82.937  115.5    0.6   265   20.8 
2025-09-22 00:00 UT   04 08 37.6   +08 50 57    82.486   82.937  116.4    0.6   265   20.8 
2025-09-23 00:00 UT   04 08 36.8   +08 50 47    82.470   82.936  117.4    0.6   265   20.8 
2025-09-24 00:00 UT   04 08 35.9   +08 50 37    82.455   82.935  118.3    0.6   266   20.8 
2025-09-25 00:00 UT   04 08 35.0   +08 50 27    82.440   82.935  119.3    0.6   266   20.8 
2025-09-26 00:00 UT   04 08 34.0   +08 50 16    82.425   82.934  120.2    0.6   266   20.8 
2025-09-27 00:00 UT   04 08 33.0   +08 50 06    82.410   82.933  121.2    0.6   266   20.8 
2025-09-28 00:00 UT   04 08 31.9   +08 49 56    82.395   82.932  122.1    0.6   267   20.8 
2025-09-29 00:00 UT   04 08 30.8   +08 49 45    82.381   82.932  123.1    0.6   267   20.8 
2025-09-30 00:00 UT   04 08 29.7   +08 49 35    82.366   82.931  124.1    0.6   267   20.8 
2025-10-01 00:00 UT   04 08 28.5   +08 49 24    82.352   82.930  125.0    0.6   268   20.8 
2025-10-02 00:00 UT   04 08 27.2   +08 49 14    82.338   82.930  126.0    0.6   268   20.8 
2025-10-03 00:00 UT   04 08 26.0   +08 49 03    82.324   82.929  126.9    0.6   268   20.8 
2025-10-04 00:00 UT   04 08 24.7   +08 48 52    82.311   82.928  127.9    0.5   268   20.8 
2025-10-05 00:00 UT   04 08 23.3   +08 48 42    82.297   82.928  128.8    0.5   269   20.8 
2025-10-06 00:00 UT   04 08 21.9   +08 48 31    82.284   82.927  129.8    0.5   269   20.8 
2025-10-07 00:00 UT   04 08 20.5   +08 48 20    82.271   82.926  130.7    0.5   270   20.8 
2025-10-08 00:00 UT   04 08 19.0   +08 48 10    82.258   82.925  131.7    0.5   270   20.8 
2025-10-09 00:00 UT   04 08 17.5   +08 47 59    82.245   82.925  132.7    0.5   270   20.8 
2025-10-10 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 

    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.