(176) Iduna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	8 Dec 2025	12.7	2.791 AU	1.896 AU	05h31m	-06°33'	149.6°	10.3°
Opposition	12 Dec 2025	12.7	2.797 AU	1.901 AU	05h28m	-06°54'	149.9°	10.2°

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 Iduna are:

            e (Eccentricity)                : 0.1722468
            a (Semimajor axis)              : 3.1802398
            i (Inclination)                 : 22.67613
            Ω (Longitude of ascending node) : 200.45174
            ω (Argument of perihelion)      : 189.02649
            M (Mean anomaly)                : 34.81371
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 208.79068
            B (Latitude of perihelion)      : -3.46765
            P (Orbital period in years)     : 5.67            
        

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
2025-12-08 00:00 UT   05 31 55.2   -06 33 53     1.896    2.791  149.6   10.3   345   12.7 
2025-12-08 17:04 UT   05 31 20.7   -06 37 34     1.897    2.792  149.7   10.2   346   12.7 
2025-12-09 00:00 UT   05 31 06.6   -06 39 01     1.897    2.792  149.8   10.2   347   12.7 
2025-12-10 00:00 UT   05 30 17.9   -06 43 54     1.898    2.794  149.8   10.2   349   12.7 
2025-12-11 00:00 UT   05 29 29.0   -06 48 29     1.899    2.795  149.9   10.2   352   12.7 
2025-12-12 00:00 UT   05 28 39.9   -06 52 49     1.900    2.796  149.9   10.2   354   12.7 
2025-12-13 00:00 UT   05 27 50.8   -06 56 52     1.902    2.798  149.9   10.2   357   12.7 
2025-12-14 00:00 UT   05 27 01.7   -07 00 39     1.904    2.799  149.8   10.2   359   12.7 
2025-12-15 00:00 UT   05 26 12.7   -07 04 08     1.906    2.800  149.7   10.2     1   12.7 
2025-12-16 00:00 UT   05 25 23.8   -07 07 21     1.909    2.802  149.5   10.3     4   12.7 
2025-12-17 00:00 UT   05 24 35.1   -07 10 17     1.911    2.803  149.3   10.3     6   12.7 
2025-12-18 00:00 UT   05 23 46.6   -07 12 56     1.914    2.804  149.1   10.4     8   12.7 
2025-12-19 00:00 UT   05 22 58.4   -07 15 19     1.917    2.806  148.8   10.5    11   12.7 
2025-12-20 00:00 UT   05 22 10.6   -07 17 24     1.921    2.807  148.5   10.6    13   12.8 
2025-12-21 00:00 UT   05 21 23.2   -07 19 12     1.925    2.809  148.1   10.7    15   12.8 
2025-12-22 00:00 UT   05 20 36.2   -07 20 44     1.929    2.810  147.7   10.8    17   12.8 
2025-12-23 00:00 UT   05 19 49.8   -07 21 59     1.933    2.811  147.3   10.9    19   12.8 
2025-12-24 00:00 UT   05 19 04.0   -07 22 58     1.937    2.813  146.9   11.0    21   12.8 
2025-12-25 00:00 UT   05 18 18.8   -07 23 39     1.942    2.814  146.4   11.2    23   12.8 
2025-12-26 00:00 UT   05 17 34.3   -07 24 05     1.947    2.816  145.9   11.3    25   12.8 
2025-12-27 00:00 UT   05 16 50.5   -07 24 15     1.952    2.817  145.3   11.5    27   12.8 
2025-12-28 00:00 UT   05 16 07.5   -07 24 08     1.957    2.818  144.8   11.6    29   12.8 
2025-12-29 00:00 UT   05 15 25.3   -07 23 46     1.963    2.820  144.2   11.8    31   12.9 
2025-12-30 00:00 UT   05 14 44.0   -07 23 08     1.969    2.821  143.6   11.9    32   12.9 
2025-12-31 00:00 UT   05 14 03.7   -07 22 15     1.975    2.823  143.0   12.1    34   12.9 
2026-01-01 00:00 UT   05 13 24.2   -07 21 07     1.981    2.824  142.3   12.3    36   12.9 
2026-01-02 00:00 UT   05 12 45.8   -07 19 45     1.987    2.825  141.7   12.5    37   12.9 
2026-01-03 00:00 UT   05 12 08.4   -07 18 07     1.994    2.827  141.0   12.6    39   12.9 
2026-01-04 00:00 UT   05 11 32.0   -07 16 16     2.001    2.828  140.3   12.8    40   12.9 
2026-01-05 00:00 UT   05 10 56.8   -07 14 10     2.008    2.830  139.6   13.0    42   13.0 
2026-01-06 00:00 UT   05 10 22.6   -07 11 51     2.016    2.831  138.9   13.2    43   13.0 
2026-01-07 00:00 UT   05 09 49.6   -07 09 18     2.023    2.833  138.1   13.4    44   13.0 

    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.