(579) Sidonia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	31 Oct 2025	12.3	2.980 AU	2.001 AU	02h40m	+03°31'	168.4°	3.8°
Today	12 Dec 2025	13.0	3.011 AU	2.262 AU	02h12m	+04°05'	132.0°	14.1°

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 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
2025-12-12 00:00 UT   02 12 56.4   +04 05 47     2.262    3.011  132.0   14.1    62   13.0 
2025-12-12 01:38 UT   02 12 55.1   +04 06 01     2.263    3.011  131.9   14.1    62   13.0 
2025-12-13 00:00 UT   02 12 38.9   +04 09 18     2.274    3.012  130.9   14.3    63   13.0 
2025-12-14 00:00 UT   02 12 22.7   +04 12 57     2.285    3.013  129.9   14.5    63   13.0 
2025-12-15 00:00 UT   02 12 07.9   +04 16 43     2.297    3.014  128.9   14.7    63   13.0 
2025-12-16 00:00 UT   02 11 54.5   +04 20 35     2.308    3.014  127.9   14.9    64   13.1 
2025-12-17 00:00 UT   02 11 42.5   +04 24 35     2.320    3.015  126.9   15.1    64   13.1 
2025-12-18 00:00 UT   02 11 31.8   +04 28 41     2.332    3.016  125.8   15.3    64   13.1 
2025-12-19 00:00 UT   02 11 22.5   +04 32 54     2.344    3.017  124.8   15.5    65   13.1 
2025-12-20 00:00 UT   02 11 14.6   +04 37 13     2.357    3.017  123.8   15.7    65   13.1 
2025-12-21 00:00 UT   02 11 08.1   +04 41 39     2.369    3.018  122.8   15.9    65   13.2 
2025-12-22 00:00 UT   02 11 03.0   +04 46 11     2.382    3.019  121.8   16.1    65   13.2 
2025-12-23 00:00 UT   02 10 59.2   +04 50 49     2.395    3.020  120.9   16.2    66   13.2 
2025-12-24 00:00 UT   02 10 56.8   +04 55 33     2.407    3.020  119.9   16.4    66   13.2 
2025-12-25 00:00 UT   02 10 55.8   +05 00 24     2.421    3.021  118.9   16.6    66   13.2 
2025-12-26 00:00 UT   02 10 56.1   +05 05 20     2.434    3.022  117.9   16.7    66   13.2 
2025-12-27 00:00 UT   02 10 57.8   +05 10 22     2.447    3.023  117.0   16.9    66   13.3 
2025-12-28 00:00 UT   02 11 00.8   +05 15 29     2.460    3.023  116.0   17.0    67   13.3 
2025-12-29 00:00 UT   02 11 05.1   +05 20 42     2.474    3.024  115.0   17.1    67   13.3 
2025-12-30 00:00 UT   02 11 10.8   +05 26 00     2.487    3.025  114.1   17.3    67   13.3 
2025-12-31 00:00 UT   02 11 17.8   +05 31 24     2.501    3.026  113.1   17.4    67   13.3 
2026-01-01 00:00 UT   02 11 26.0   +05 36 52     2.515    3.026  112.2   17.5    67   13.3 
2026-01-02 00:00 UT   02 11 35.6   +05 42 25     2.529    3.027  111.3   17.6    68   13.4 
2026-01-03 00:00 UT   02 11 46.5   +05 48 04     2.543    3.028  110.3   17.7    68   13.4 
2026-01-04 00:00 UT   02 11 58.6   +05 53 46     2.557    3.029  109.4   17.8    68   13.4 
2026-01-05 00:00 UT   02 12 11.9   +05 59 34     2.571    3.029  108.5   17.9    68   13.4 
2026-01-06 00:00 UT   02 12 26.5   +06 05 26     2.585    3.030  107.6   18.0    68   13.4 
2026-01-07 00:00 UT   02 12 42.4   +06 11 22     2.599    3.031  106.6   18.1    68   13.4 
2026-01-08 00:00 UT   02 12 59.4   +06 17 23     2.613    3.032  105.7   18.2    69   13.5 
2026-01-09 00:00 UT   02 13 17.7   +06 23 28     2.628    3.032  104.8   18.3    69   13.5 
2026-01-10 00:00 UT   02 13 37.1   +06 29 36     2.642    3.033  103.9   18.3    69   13.5 
2026-01-11 00:00 UT   02 13 57.8   +06 35 49     2.657    3.034  103.0   18.4    69   13.5 

    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.