(90377) Sedna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	21 Nov 2024	20.7	83.430 AU	82.464 AU	04h01m	+08°24'	168.0°	0.1°
Today	18 Jan 2025	20.8	83.389 AU	82.878 AU	03h59m	+08°22'	121.0°	0.6°

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)                : 0.8607712
            a (Semimajor axis)              : 548.2997125
            i (Inclination)                 : 11.92869
            Ω (Longitude of ascending node) : 144.34714
            ω (Argument of perihelion)      : 310.84306
            M (Mean anomaly)                : 358.56644
            Epoch                           : 2024 Mar 31

            L (Longitude of perihelion)     : 95.80997
            B (Latitude of perihelion)      : -8.99596
            P (Orbital period in years)     : 12838.88            
        

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
2025-01-18 00:00 UT   03 59 38.5   +08 22 12    82.878   83.389  121.0    0.6    71   20.8 
2025-01-18 06:48 UT   03 59 38.1   +08 22 13    82.882   83.388  120.7    0.6    71   20.8 
2025-01-19 00:00 UT   03 59 37.3   +08 22 16    82.892   83.388  120.0    0.6    71   20.8 
2025-01-20 00:00 UT   03 59 36.1   +08 22 20    82.906   83.387  119.0    0.6    72   20.8 
2025-01-21 00:00 UT   03 59 35.0   +08 22 25    82.920   83.386  118.0    0.6    72   20.8 
2025-01-22 00:00 UT   03 59 33.9   +08 22 30    82.934   83.386  117.0    0.6    72   20.8 
2025-01-23 00:00 UT   03 59 32.9   +08 22 35    82.949   83.385  116.0    0.6    72   20.8 
2025-01-24 00:00 UT   03 59 31.9   +08 22 40    82.963   83.384  115.0    0.6    73   20.8 
2025-01-25 00:00 UT   03 59 31.0   +08 22 46    82.978   83.384  114.0    0.6    73   20.8 
2025-01-26 00:00 UT   03 59 30.1   +08 22 51    82.993   83.383  113.0    0.6    73   20.8 
2025-01-27 00:00 UT   03 59 29.2   +08 22 57    83.008   83.382  112.0    0.6    73   20.8 
2025-01-28 00:00 UT   03 59 28.4   +08 23 03    83.023   83.381  111.1    0.6    74   20.8 
2025-01-29 00:00 UT   03 59 27.6   +08 23 10    83.038   83.381  110.1    0.6    74   20.8 
2025-01-30 00:00 UT   03 59 26.9   +08 23 16    83.053   83.380  109.1    0.6    74   20.8 
2025-01-31 00:00 UT   03 59 26.2   +08 23 23    83.069   83.379  108.1    0.6    74   20.8 
2025-02-01 00:00 UT   03 59 25.6   +08 23 30    83.084   83.379  107.1    0.6    75   20.8 
2025-02-02 00:00 UT   03 59 25.1   +08 23 37    83.100   83.378  106.1    0.7    75   20.8 
2025-02-03 00:00 UT   03 59 24.5   +08 23 44    83.115   83.377  105.1    0.7    75   20.8 
2025-02-04 00:00 UT   03 59 24.1   +08 23 51    83.131   83.376  104.1    0.7    75   20.8 
2025-02-05 00:00 UT   03 59 23.6   +08 23 59    83.147   83.376  103.1    0.7    75   20.8 
2025-02-06 00:00 UT   03 59 23.2   +08 24 07    83.163   83.375  102.1    0.7    76   20.8 
2025-02-07 00:00 UT   03 59 22.9   +08 24 15    83.179   83.374  101.1    0.7    76   20.8 
2025-02-08 00:00 UT   03 59 22.6   +08 24 23    83.195   83.374  100.1    0.7    76   20.8 
2025-02-09 00:00 UT   03 59 22.4   +08 24 31    83.211   83.373   99.1    0.7    76   20.8 
2025-02-10 00:00 UT   03 59 22.2   +08 24 40    83.227   83.372   98.2    0.7    76   20.8 
2025-02-11 00:00 UT   03 59 22.1   +08 24 48    83.243   83.371   97.2    0.7    77   20.8 
2025-02-12 00:00 UT   03 59 22.0   +08 24 57    83.259   83.371   96.2    0.7    77   20.8 
2025-02-13 00:00 UT   03 59 21.9   +08 25 06    83.275   83.370   95.2    0.7    77   20.8 
2025-02-14 00:00 UT   03 59 21.9   +08 25 15    83.292   83.369   94.2    0.7    77   20.8 
2025-02-15 00:00 UT   03 59 22.0   +08 25 25    83.308   83.369   93.2    0.7    78   20.8 
2025-02-16 00:00 UT   03 59 22.1   +08 25 34    83.324   83.368   92.2    0.7    78   20.8 
2025-02-17 00:00 UT   03 59 22.3   +08 25 44    83.340   83.367   91.2    0.7    78   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.