(579) Sidonia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	25 Feb 2026	14.0	3.067 AU	3.317 AU	02h46m	+11°56'	66.9°	17.3°
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)                : 81.53747
            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
2026-02-25 00:00 UT   02 46 29.9   +11 56 53     3.317    3.067   66.9   17.3    74   14.0 
2026-02-25 18:39 UT   02 47 17.8   +12 02 44     3.328    3.067   66.3   17.2    74   14.0 
2026-02-26 00:00 UT   02 47 31.6   +12 04 25     3.331    3.068   66.2   17.2    74   14.0 
2026-02-27 00:00 UT   02 48 34.0   +12 11 56     3.345    3.068   65.4   17.1    75   14.0 
2026-02-28 00:00 UT   02 49 36.9   +12 19 27     3.358    3.069   64.7   17.0    75   14.0 
2026-03-01 00:00 UT   02 50 40.5   +12 26 58     3.372    3.070   64.0   16.9    75   14.0 
2026-03-02 00:00 UT   02 51 44.7   +12 34 28     3.386    3.070   63.3   16.8    75   14.0 
2026-03-03 00:00 UT   02 52 49.5   +12 41 58     3.399    3.071   62.6   16.6    75   14.0 
2026-03-04 00:00 UT   02 53 54.8   +12 49 28     3.412    3.072   61.9   16.5    75   14.0 
2026-03-05 00:00 UT   02 55 00.7   +12 56 56     3.426    3.073   61.2   16.4    75   14.0 
2026-03-06 00:00 UT   02 56 07.2   +13 04 25     3.439    3.073   60.4   16.3    75   14.0 
2026-03-07 00:00 UT   02 57 14.3   +13 11 52     3.452    3.074   59.7   16.2    75   14.0 
2026-03-08 00:00 UT   02 58 21.9   +13 19 19     3.465    3.075   59.0   16.1    76   14.0 
2026-03-09 00:00 UT   02 59 30.0   +13 26 45     3.478    3.075   58.3   15.9    76   14.0 
2026-03-10 00:00 UT   03 00 38.6   +13 34 10     3.491    3.076   57.6   15.8    76   14.0 
2026-03-11 00:00 UT   03 01 47.8   +13 41 34     3.504    3.077   56.9   15.7    76   14.0 
2026-03-12 00:00 UT   03 02 57.6   +13 48 58     3.517    3.078   56.3   15.6    76   14.0 
2026-03-13 00:00 UT   03 04 07.8   +13 56 20     3.529    3.078   55.6   15.4    76   14.0 
2026-03-14 00:00 UT   03 05 18.5   +14 03 41     3.542    3.079   54.9   15.3    76   14.0 
2026-03-15 00:00 UT   03 06 29.8   +14 11 01     3.554    3.080   54.2   15.2    76   14.0 
2026-03-16 00:00 UT   03 07 41.5   +14 18 20     3.566    3.080   53.5   15.0    77   14.0 
2026-03-17 00:00 UT   03 08 53.7   +14 25 38     3.579    3.081   52.8   14.9    77   14.1 
2026-03-18 00:00 UT   03 10 06.4   +14 32 55     3.591    3.082   52.1   14.8    77   14.1 
2026-03-19 00:00 UT   03 11 19.6   +14 40 10     3.603    3.083   51.5   14.6    77   14.1 
2026-03-20 00:00 UT   03 12 33.3   +14 47 24     3.615    3.083   50.8   14.5    77   14.1 
2026-03-21 00:00 UT   03 13 47.4   +14 54 36     3.626    3.084   50.1   14.3    77   14.1 
2026-03-22 00:00 UT   03 15 01.9   +15 01 47     3.638    3.085   49.4   14.2    77   14.1 
2026-03-23 00:00 UT   03 16 16.9   +15 08 56     3.650    3.085   48.8   14.1    77   14.1 
2026-03-24 00:00 UT   03 17 32.4   +15 16 04     3.661    3.086   48.1   13.9    78   14.1 

    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.