(579) Sidonia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	31 Oct 2026	13.8	3.208 AU	2.932 AU	08h13m	+24°06'	97.0°	17.9°
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)                : 0.0759741
            a (Semimajor axis)              : 3.0126631
            i (Inclination)                 : 11.01636
            Ω (Longitude of ascending node) : 82.62229
            ω (Argument of perihelion)      : 229.26402
            M (Mean anomaly)                : 119.08336
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 131.35867
            B (Latitude of perihelion)      : -8.32530
            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
2026-10-31 00:00 UT   08 13 17.7   +24 06 39     2.932    3.208   97.0   17.9   282   13.8 
2026-10-31 14:36 UT   08 13 38.4   +24 07 34     2.923    3.208   97.5   17.9   282   13.8 
2026-11-01 00:00 UT   08 13 51.5   +24 08 10     2.918    3.208   97.9   17.8   282   13.8 
2026-11-02 00:00 UT   08 14 24.1   +24 09 46     2.904    3.209   98.8   17.8   282   13.8 
2026-11-03 00:00 UT   08 14 55.5   +24 11 27     2.890    3.209   99.7   17.7   282   13.8 
2026-11-04 00:00 UT   08 15 25.9   +24 13 12     2.876    3.209  100.5   17.7   282   13.8 
2026-11-05 00:00 UT   08 15 55.0   +24 15 03     2.862    3.210  101.4   17.6   282   13.7 
2026-11-06 00:00 UT   08 16 22.9   +24 16 59     2.848    3.210  102.3   17.6   282   13.7 
2026-11-07 00:00 UT   08 16 49.7   +24 18 59     2.835    3.210  103.3   17.5   282   13.7 
2026-11-08 00:00 UT   08 17 15.2   +24 21 06     2.821    3.211  104.2   17.4   282   13.7 
2026-11-09 00:00 UT   08 17 39.4   +24 23 17     2.807    3.211  105.1   17.3   282   13.7 
2026-11-10 00:00 UT   08 18 02.4   +24 25 34     2.794    3.211  106.0   17.2   282   13.7 
2026-11-11 00:00 UT   08 18 24.2   +24 27 56     2.780    3.212  106.9   17.2   282   13.7 
2026-11-12 00:00 UT   08 18 44.7   +24 30 23     2.767    3.212  107.9   17.1   282   13.7 
2026-11-13 00:00 UT   08 19 03.8   +24 32 56     2.754    3.212  108.8   17.0   282   13.6 
2026-11-14 00:00 UT   08 19 21.7   +24 35 35     2.740    3.213  109.8   16.9   281   13.6 
2026-11-15 00:00 UT   08 19 38.3   +24 38 19     2.727    3.213  110.7   16.7   281   13.6 
2026-11-16 00:00 UT   08 19 53.5   +24 41 09     2.714    3.213  111.7   16.6   281   13.6 
2026-11-17 00:00 UT   08 20 07.4   +24 44 04     2.701    3.214  112.6   16.5   281   13.6 
2026-11-18 00:00 UT   08 20 19.9   +24 47 05     2.688    3.214  113.6   16.4   281   13.6 
2026-11-19 00:00 UT   08 20 31.1   +24 50 11     2.675    3.214  114.6   16.2   281   13.6 
2026-11-20 00:00 UT   08 20 40.9   +24 53 24     2.663    3.215  115.5   16.1   281   13.5 
2026-11-21 00:00 UT   08 20 49.3   +24 56 41     2.650    3.215  116.5   16.0   281   13.5 
2026-11-22 00:00 UT   08 20 56.3   +25 00 05     2.638    3.215  117.5   15.8   281   13.5 
2026-11-23 00:00 UT   08 21 01.9   +25 03 34     2.625    3.216  118.5   15.7   280   13.5 
2026-11-24 00:00 UT   08 21 06.1   +25 07 08     2.613    3.216  119.5   15.5   280   13.5 
2026-11-25 00:00 UT   08 21 08.9   +25 10 49     2.601    3.216  120.5   15.3   280   13.5 
2026-11-26 00:00 UT   08 21 10.3   +25 14 34     2.589    3.217  121.5   15.2   280   13.5 
2026-11-27 00:00 UT   08 21 10.2   +25 18 26     2.577    3.217  122.5   15.0   280   13.4 
2026-11-28 00:00 UT   08 21 08.6   +25 22 23     2.565    3.217  123.6   14.8   280   13.4 
2026-11-29 00:00 UT   08 21 05.6   +25 26 25     2.554    3.218  124.6   14.6   279   13.4 
2026-11-30 00:00 UT   08 21 01.2   +25 30 33     2.542    3.218  125.6   14.4   279   13.4 

    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.