(579) Sidonia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	19 Sep 2026	14.1	3.191 AU	3.502 AU	07h35m	+23°53'	63.9°	16.4°
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) : 82.62230
            ω (Argument of perihelion)      : 229.26402
            M (Mean anomaly)                : 119.08336
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 131.35868
            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
2026-09-19 00:00 UT   07 35 47.2   +23 53 03     3.502    3.191   63.9   16.4   280   14.1 
2026-09-19 10:31 UT   07 36 17.5   +23 52 53     3.496    3.191   64.2   16.5   280   14.1 
2026-09-20 00:00 UT   07 36 56.1   +23 52 42     3.489    3.191   64.7   16.5   280   14.1 
2026-09-21 00:00 UT   07 38 04.4   +23 52 21     3.477    3.192   65.4   16.6   281   14.1 
2026-09-22 00:00 UT   07 39 12.1   +23 52 02     3.464    3.192   66.1   16.7   281   14.1 
2026-09-23 00:00 UT   07 40 19.2   +23 51 43     3.451    3.192   66.8   16.8   281   14.1 
2026-09-24 00:00 UT   07 41 25.7   +23 51 26     3.438    3.193   67.5   16.9   281   14.1 
2026-09-25 00:00 UT   07 42 31.5   +23 51 09     3.426    3.193   68.3   17.0   281   14.1 
2026-09-26 00:00 UT   07 43 36.7   +23 50 54     3.413    3.194   69.0   17.0   281   14.1 
2026-09-27 00:00 UT   07 44 41.2   +23 50 40     3.400    3.194   69.7   17.1   281   14.1 
2026-09-28 00:00 UT   07 45 45.1   +23 50 27     3.387    3.195   70.5   17.2   281   14.1 
2026-09-29 00:00 UT   07 46 48.2   +23 50 15     3.373    3.195   71.2   17.3   281   14.1 
2026-09-30 00:00 UT   07 47 50.7   +23 50 06     3.360    3.195   72.0   17.3   281   14.1 
2026-10-01 00:00 UT   07 48 52.5   +23 49 57     3.347    3.196   72.7   17.4   281   14.1 
2026-10-02 00:00 UT   07 49 53.6   +23 49 51     3.333    3.196   73.5   17.5   281   14.1 
2026-10-03 00:00 UT   07 50 54.0   +23 49 46     3.320    3.197   74.2   17.5   281   14.1 
2026-10-04 00:00 UT   07 51 53.6   +23 49 43     3.307    3.197   75.0   17.6   282   14.1 
2026-10-05 00:00 UT   07 52 52.5   +23 49 42     3.293    3.198   75.8   17.6   282   14.0 
2026-10-06 00:00 UT   07 53 50.6   +23 49 43     3.280    3.198   76.5   17.7   282   14.0 
2026-10-07 00:00 UT   07 54 47.9   +23 49 47     3.266    3.198   77.3   17.8   282   14.0 
2026-10-08 00:00 UT   07 55 44.5   +23 49 53     3.252    3.199   78.1   17.8   282   14.0 
2026-10-09 00:00 UT   07 56 40.2   +23 50 01     3.239    3.199   78.8   17.8   282   14.0 
2026-10-10 00:00 UT   07 57 35.1   +23 50 12     3.225    3.200   79.6   17.9   282   14.0 
2026-10-11 00:00 UT   07 58 29.2   +23 50 25     3.211    3.200   80.4   17.9   282   14.0 
2026-10-12 00:00 UT   07 59 22.5   +23 50 41     3.197    3.200   81.2   18.0   282   14.0 
2026-10-13 00:00 UT   08 00 14.9   +23 51 00     3.183    3.201   82.0   18.0   282   14.0 
2026-10-14 00:00 UT   08 01 06.4   +23 51 22     3.169    3.201   82.8   18.0   282   14.0 
2026-10-15 00:00 UT   08 01 57.1   +23 51 47     3.156    3.202   83.6   18.0   282   14.0 
2026-10-16 00:00 UT   08 02 46.9   +23 52 15     3.142    3.202   84.4   18.1   282   14.0 
2026-10-17 00:00 UT   08 03 35.7   +23 52 47     3.128    3.202   85.2   18.1   282   14.0 
2026-10-18 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 

    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.