(579) Sidonia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	17 Oct 2026	14.0	3.202 AU	3.128 AU	08h03m	+23°52'	85.2°	18.1°
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
2026-10-17 00:00 UT   08 03 35.7   +23 52 47     3.128    3.202   85.2   18.1   282   14.0 
2026-10-17 13:49 UT   08 04 03.4   +23 53 06     3.120    3.203   85.7   18.1   282   13.9 
2026-10-18 00:00 UT   08 04 23.7   +23 53 22     3.114    3.203   86.0   18.1   282   13.9 
2026-10-19 00:00 UT   08 05 10.7   +23 53 60     3.100    3.203   86.8   18.1   282   13.9 
2026-10-20 00:00 UT   08 05 56.7   +23 54 41     3.086    3.204   87.7   18.1   282   13.9 
2026-10-21 00:00 UT   08 06 41.9   +23 55 27     3.072    3.204   88.5   18.1   282   13.9 
2026-10-22 00:00 UT   08 07 26.0   +23 56 16     3.058    3.204   89.3   18.1   282   13.9 
2026-10-23 00:00 UT   08 08 09.2   +23 57 09     3.044    3.205   90.2   18.1   282   13.9 
2026-10-24 00:00 UT   08 08 51.4   +23 58 05     3.030    3.205   91.0   18.1   282   13.9 
2026-10-25 00:00 UT   08 09 32.5   +23 59 06     3.016    3.206   91.8   18.1   282   13.9 
2026-10-26 00:00 UT   08 10 12.7   +24 00 11     3.001    3.206   92.7   18.0   282   13.9 
2026-10-27 00:00 UT   08 10 51.8   +24 01 20     2.987    3.206   93.5   18.0   282   13.9 
2026-10-28 00:00 UT   08 11 29.9   +24 02 33     2.973    3.207   94.4   18.0   282   13.8 
2026-10-29 00:00 UT   08 12 06.9   +24 03 50     2.959    3.207   95.3   18.0   282   13.8 
2026-10-30 00:00 UT   08 12 42.9   +24 05 12     2.946    3.207   96.1   17.9   282   13.8 
2026-10-31 00:00 UT   08 13 17.7   +24 06 39     2.932    3.208   97.0   17.9   282   13.8 
2026-11-01 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 

    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.