(106) Dione
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	12 Nov 2025	13.9	3.189 AU	3.726 AU	18h44m	-26°08'	50.5°	13.9°
Opposition	18 Sep 2026	11.5	2.757 AU	1.756 AU	23h56m	-07°32'	173.3°	2.4°

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 Dione are:

            e (Eccentricity)                : 0.1588532
            a (Semimajor axis)              : 3.1824910
            i (Inclination)                 : 4.57500
            Ω (Longitude of ascending node) : 61.98311
            ω (Argument of perihelion)      : 331.74654
            M (Mean anomaly)                : 279.92763
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 33.80583
            B (Latitude of perihelion)      : -2.16389
            P (Orbital period in years)     : 5.68            
        

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
2025-11-12 00:00 UT   18 44 06.9   -26 08 19     3.726    3.189   50.5   13.9    88   13.9 
2025-11-12 06:44 UT   18 44 30.0   -26 07 53     3.729    3.189   50.3   13.8    88   13.9 
2025-11-13 00:00 UT   18 45 29.5   -26 06 45     3.736    3.187   49.8   13.7    88   13.9 
2025-11-14 00:00 UT   18 46 52.4   -26 05 09     3.745    3.186   49.1   13.6    88   13.9 
2025-11-15 00:00 UT   18 48 15.9   -26 03 29     3.754    3.184   48.4   13.4    88   13.9 
2025-11-16 00:00 UT   18 49 39.8   -26 01 47     3.763    3.183   47.7   13.3    88   13.9 
2025-11-17 00:00 UT   18 51 04.1   -26 00 01     3.772    3.181   47.0   13.1    88   13.9 
2025-11-18 00:00 UT   18 52 28.9   -25 58 13     3.781    3.180   46.3   13.0    88   13.9 
2025-11-19 00:00 UT   18 53 54.1   -25 56 21     3.790    3.178   45.6   12.8    88   13.9 
2025-11-20 00:00 UT   18 55 19.7   -25 54 26     3.798    3.177   45.0   12.7    88   13.9 
2025-11-21 00:00 UT   18 56 45.8   -25 52 29     3.807    3.175   44.3   12.5    88   13.9 
2025-11-22 00:00 UT   18 58 12.2   -25 50 28     3.815    3.174   43.6   12.4    87   13.9 
2025-11-23 00:00 UT   18 59 39.0   -25 48 24     3.823    3.172   42.9   12.2    87   13.9 
2025-11-24 00:00 UT   19 01 06.2   -25 46 16     3.831    3.171   42.2   12.1    87   13.9 
2025-11-25 00:00 UT   19 02 33.8   -25 44 06     3.839    3.169   41.6   11.9    87   13.9 
2025-11-26 00:00 UT   19 04 01.7   -25 41 52     3.847    3.168   40.9   11.8    87   13.9 
2025-11-27 00:00 UT   19 05 30.0   -25 39 35     3.855    3.166   40.2   11.6    87   13.9 
2025-11-28 00:00 UT   19 06 58.6   -25 37 15     3.862    3.164   39.5   11.4    87   13.9 
2025-11-29 00:00 UT   19 08 27.5   -25 34 51     3.870    3.163   38.9   11.3    87   13.9 
2025-11-30 00:00 UT   19 09 56.8   -25 32 25     3.877    3.161   38.2   11.1    87   13.9 
2025-12-01 00:00 UT   19 11 26.4   -25 29 54     3.884    3.160   37.5   11.0    87   13.9 
2025-12-02 00:00 UT   19 12 56.3   -25 27 21     3.891    3.158   36.8   10.8    87   13.9 
2025-12-03 00:00 UT   19 14 26.4   -25 24 44     3.898    3.157   36.2   10.6    87   13.9 
2025-12-04 00:00 UT   19 15 56.9   -25 22 04     3.905    3.155   35.5   10.5    87   13.9 
2025-12-05 00:00 UT   19 17 27.7   -25 19 20     3.912    3.154   34.8   10.3    87   13.9 
2025-12-06 00:00 UT   19 18 58.7   -25 16 33     3.918    3.152   34.2   10.1    87   13.9 
2025-12-07 00:00 UT   19 20 30.0   -25 13 42     3.925    3.151   33.5    9.9    87   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.