(579) Sidonia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	14 Jul 2025	13.7	2.900 AU	2.995 AU	02h30m	+04°35'	74.8°	19.8°
Opposition	31 Oct 2025	12.3	2.980 AU	2.001 AU	02h40m	+03°31'	168.4°	3.8°

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)                : 0.0763123
            a (Semimajor axis)              : 3.0119454
            i (Inclination)                 : 11.01732
            Ω (Longitude of ascending node) : 82.62131
            ω (Argument of perihelion)      : 229.06766
            M (Mean anomaly)                : 43.83391
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 131.16075
            B (Latitude of perihelion)      : -8.30122
            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. 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
2025-07-14 00:00 UT   02 30 59.7   +04 35 31     2.995    2.900   74.8   19.8   249   13.7 
2025-07-14 21:44 UT   02 31 55.8   +04 38 42     2.985    2.901   75.4   19.8   249   13.7 
2025-07-15 00:00 UT   02 32 01.6   +04 39 02     2.983    2.901   75.5   19.8   249   13.7 
2025-07-16 00:00 UT   02 33 02.9   +04 42 27     2.971    2.901   76.2   19.9   249   13.7 
2025-07-17 00:00 UT   02 34 03.6   +04 45 48     2.959    2.902   76.8   19.9   249   13.7 
2025-07-18 00:00 UT   02 35 03.5   +04 49 03     2.947    2.903   77.5   20.0   249   13.7 
2025-07-19 00:00 UT   02 36 02.9   +04 52 12     2.935    2.903   78.2   20.0   250   13.7 
2025-07-20 00:00 UT   02 37 01.5   +04 55 17     2.923    2.904   78.9   20.1   250   13.7 
2025-07-21 00:00 UT   02 37 59.4   +04 58 16     2.911    2.905   79.6   20.1   250   13.7 
2025-07-22 00:00 UT   02 38 56.6   +05 01 09     2.898    2.906   80.3   20.2   250   13.7 
2025-07-23 00:00 UT   02 39 53.1   +05 03 57     2.886    2.906   81.0   20.2   250   13.7 
2025-07-24 00:00 UT   02 40 48.8   +05 06 40     2.874    2.907   81.7   20.2   251   13.6 
2025-07-25 00:00 UT   02 41 43.8   +05 09 17     2.861    2.908   82.4   20.3   251   13.6 
2025-07-26 00:00 UT   02 42 38.1   +05 11 49     2.849    2.908   83.2   20.3   251   13.6 
2025-07-27 00:00 UT   02 43 31.5   +05 14 15     2.837    2.909   83.9   20.3   251   13.6 
2025-07-28 00:00 UT   02 44 24.2   +05 16 36     2.824    2.910   84.6   20.3   251   13.6 
2025-07-29 00:00 UT   02 45 16.0   +05 18 51     2.812    2.910   85.3   20.3   251   13.6 
2025-07-30 00:00 UT   02 46 07.0   +05 21 01     2.799    2.911   86.0   20.4   252   13.6 
2025-07-31 00:00 UT   02 46 57.2   +05 23 05     2.787    2.912   86.8   20.4   252   13.6 
2025-08-01 00:00 UT   02 47 46.6   +05 25 04     2.774    2.913   87.5   20.4   252   13.6 
2025-08-02 00:00 UT   02 48 35.0   +05 26 57     2.762    2.913   88.3   20.4   252   13.6 
2025-08-03 00:00 UT   02 49 22.7   +05 28 45     2.749    2.914   89.0   20.4   252   13.6 
2025-08-04 00:00 UT   02 50 09.4   +05 30 27     2.737    2.915   89.7   20.4   253   13.6 
2025-08-05 00:00 UT   02 50 55.2   +05 32 04     2.724    2.915   90.5   20.4   253   13.5 
2025-08-06 00:00 UT   02 51 40.1   +05 33 36     2.712    2.916   91.3   20.3   253   13.5 
2025-08-07 00:00 UT   02 52 24.2   +05 35 02     2.699    2.917   92.0   20.3   253   13.5 
2025-08-08 00:00 UT   02 53 07.2   +05 36 22     2.687    2.917   92.8   20.3   253   13.5 
2025-08-09 00:00 UT   02 53 49.3   +05 37 37     2.674    2.918   93.6   20.3   254   13.5 
2025-08-10 00:00 UT   02 54 30.5   +05 38 47     2.662    2.919   94.3   20.3   254   13.5 
2025-08-11 00:00 UT   02 55 10.7   +05 39 51     2.649    2.920   95.1   20.2   254   13.5 
2025-08-12 00:00 UT   02 55 49.8   +05 40 49     2.637    2.920   95.9   20.2   254   13.5 
2025-08-13 00:00 UT   02 56 28.0   +05 41 43     2.625    2.921   96.7   20.2   254   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.