(579) Sidonia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	27 Jun 2026	13.9	3.147 AU	4.142 AU	05h36m	+23°08'	10.3°	3.3°
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
2026-06-27 00:00 UT   05 36 49.7   +23 08 36     4.142    3.147   10.3    3.3   267   13.9 
2026-06-27 04:32 UT   05 37 07.3   +23 09 02     4.142    3.147   10.5    3.4   267   13.9 
2026-06-28 00:00 UT   05 38 22.8   +23 10 55     4.140    3.148   10.9    3.5   267   13.9 
2026-06-29 00:00 UT   05 39 55.8   +23 13 11     4.138    3.148   11.5    3.7   267   13.9 
2026-06-30 00:00 UT   05 41 28.8   +23 15 24     4.136    3.149   12.1    3.9   268   13.9 
2026-07-01 00:00 UT   05 43 01.8   +23 17 33     4.133    3.150   12.7    4.1   268   14.0 
2026-07-02 00:00 UT   05 44 34.6   +23 19 39     4.131    3.150   13.3    4.3   268   14.0 
2026-07-03 00:00 UT   05 46 07.4   +23 21 42     4.128    3.151   13.9    4.5   268   14.0 
2026-07-04 00:00 UT   05 47 40.2   +23 23 41     4.125    3.151   14.5    4.6   269   14.0 
2026-07-05 00:00 UT   05 49 12.9   +23 25 37     4.122    3.152   15.1    4.8   269   14.0 
2026-07-06 00:00 UT   05 50 45.5   +23 27 30     4.119    3.152   15.7    5.0   269   14.0 
2026-07-07 00:00 UT   05 52 18.0   +23 29 19     4.116    3.153   16.3    5.2   269   14.0 
2026-07-08 00:00 UT   05 53 50.4   +23 31 05     4.112    3.154   16.9    5.4   270   14.0 
2026-07-09 00:00 UT   05 55 22.8   +23 32 48     4.109    3.154   17.5    5.6   270   14.0 
2026-07-10 00:00 UT   05 56 55.0   +23 34 28     4.105    3.155   18.1    5.8   270   14.0 
2026-07-11 00:00 UT   05 58 27.2   +23 36 04     4.101    3.155   18.7    5.9   270   14.0 
2026-07-12 00:00 UT   05 59 59.2   +23 37 37     4.097    3.156   19.3    6.1   271   14.0 
2026-07-13 00:00 UT   06 01 31.2   +23 39 07     4.093    3.156   19.9    6.3   271   14.1 
2026-07-14 00:00 UT   06 03 03.0   +23 40 34     4.089    3.157   20.5    6.5   271   14.1 
2026-07-15 00:00 UT   06 04 34.6   +23 41 58     4.084    3.158   21.1    6.7   271   14.1 
2026-07-16 00:00 UT   06 06 06.2   +23 43 18     4.080    3.158   21.7    6.8   271   14.1 
2026-07-17 00:00 UT   06 07 37.6   +23 44 36     4.075    3.159   22.4    7.0   272   14.1 
2026-07-18 00:00 UT   06 09 08.8   +23 45 50     4.070    3.159   23.0    7.2   272   14.1 
2026-07-19 00:00 UT   06 10 39.9   +23 47 02     4.065    3.160   23.6    7.4   272   14.1 
2026-07-20 00:00 UT   06 12 10.9   +23 48 10     4.060    3.160   24.2    7.6   272   14.1 
2026-07-21 00:00 UT   06 13 41.6   +23 49 16     4.055    3.161   24.8    7.7   272   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.