(579) Sidonia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	11 Jan 2026	13.5	3.034 AU	2.657 AU	02h13m	+06°35'	103.0°	18.4°
Opposition	15 Jan 2027	12.6	3.230 AU	2.254 AU	07h53m	+29°31'	171.5°	2.6°

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 Sidonia are:

            e (Eccentricity)                : 0.0761880
            a (Semimajor axis)              : 3.0118595
            i (Inclination)                 : 11.01735
            Ω (Longitude of ascending node) : 82.62080
            ω (Argument of perihelion)      : 229.09026
            M (Mean anomaly)                : 81.53748
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 131.18289
            B (Latitude of perihelion)      : -8.30410
            P (Orbital period in years)     : 5.23            
        

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
2026-01-11 00:00 UT   02 13 57.8   +06 35 49     2.657    3.034  103.0   18.4    69   13.5 
2026-01-11 09:39 UT   02 14 06.4   +06 38 20     2.663    3.034  102.7   18.4    69   13.5 
2026-01-12 00:00 UT   02 14 19.6   +06 42 06     2.671    3.035  102.1   18.5    69   13.5 
2026-01-13 00:00 UT   02 14 42.6   +06 48 26     2.686    3.035  101.3   18.5    69   13.5 
2026-01-14 00:00 UT   02 15 06.7   +06 54 50     2.701    3.036  100.4   18.6    69   13.5 
2026-01-15 00:00 UT   02 15 32.0   +07 01 18     2.715    3.037   99.5   18.6    70   13.6 
2026-01-16 00:00 UT   02 15 58.4   +07 07 49     2.730    3.038   98.6   18.7    70   13.6 
2026-01-17 00:00 UT   02 16 25.9   +07 14 23     2.745    3.038   97.8   18.7    70   13.6 
2026-01-18 00:00 UT   02 16 54.5   +07 21 01     2.760    3.039   96.9   18.7    70   13.6 
2026-01-19 00:00 UT   02 17 24.2   +07 27 42     2.775    3.040   96.0   18.8    70   13.6 
2026-01-20 00:00 UT   02 17 55.0   +07 34 26     2.789    3.041   95.2   18.8    70   13.6 
2026-01-21 00:00 UT   02 18 26.9   +07 41 13     2.804    3.041   94.3   18.8    70   13.6 
2026-01-22 00:00 UT   02 18 59.8   +07 48 02     2.819    3.042   93.5   18.8    70   13.6 
2026-01-23 00:00 UT   02 19 33.7   +07 54 55     2.834    3.043   92.6   18.9    71   13.7 
2026-01-24 00:00 UT   02 20 08.7   +08 01 50     2.849    3.044   91.8   18.9    71   13.7 
2026-01-25 00:00 UT   02 20 44.7   +08 08 47     2.864    3.044   91.0   18.9    71   13.7 
2026-01-26 00:00 UT   02 21 21.7   +08 15 47     2.879    3.045   90.1   18.9    71   13.7 
2026-01-27 00:00 UT   02 21 59.6   +08 22 49     2.894    3.046   89.3   18.9    71   13.7 
2026-01-28 00:00 UT   02 22 38.5   +08 29 53     2.909    3.046   88.5   18.9    71   13.7 
2026-01-29 00:00 UT   02 23 18.4   +08 36 60     2.924    3.047   87.7   18.8    71   13.7 
2026-01-30 00:00 UT   02 23 59.2   +08 44 08     2.939    3.048   86.9   18.8    71   13.7 
2026-01-31 00:00 UT   02 24 40.9   +08 51 18     2.954    3.049   86.0   18.8    72   13.8 
2026-02-01 00:00 UT   02 25 23.6   +08 58 30     2.969    3.049   85.2   18.8    72   13.8 
2026-02-02 00:00 UT   02 26 07.1   +09 05 44     2.984    3.050   84.4   18.8    72   13.8 
2026-02-03 00:00 UT   02 26 51.5   +09 12 59     2.999    3.051   83.6   18.7    72   13.8 
2026-02-04 00:00 UT   02 27 36.8   +09 20 16     3.013    3.052   82.8   18.7    72   13.8 
2026-02-05 00:00 UT   02 28 22.9   +09 27 35     3.028    3.052   82.1   18.7    72   13.8 
2026-02-06 00:00 UT   02 29 09.9   +09 34 54     3.043    3.053   81.3   18.6    72   13.8 
2026-02-07 00:00 UT   02 29 57.7   +09 42 15     3.058    3.054   80.5   18.6    72   13.8 
2026-02-08 00:00 UT   02 30 46.4   +09 49 38     3.073    3.055   79.7   18.5    72   13.8 
2026-02-09 00:00 UT   02 31 35.8   +09 57 01     3.087    3.055   78.9   18.5    73   13.8 
2026-02-10 00:00 UT   02 32 26.1   +10 04 26     3.102    3.056   78.1   18.4    73   13.9 

    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.