(176) Iduna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	16 Sep 2025	13.6	2.696 AU	2.500 AU	05h32m	+07°06'	90.1°	21.9°
Opposition	12 Dec 2025	12.7	2.797 AU	1.901 AU	05h28m	-06°55'	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)                : 0.1719254
            a (Semimajor axis)              : 3.1788159
            i (Inclination)                 : 22.68083
            Ω (Longitude of ascending node) : 200.46166
            ω (Argument of perihelion)      : 188.94474
            M (Mean anomaly)                : 0.10929
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 208.72462
            B (Latitude of perihelion)      : -3.43714
            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. A more printer-friendly version of the same chart can be found below.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-09-16 00:00 UT   05 32 35.1   +07 06 06     2.500    2.696   90.1   21.9   267   13.6 
2025-09-16 02:53 UT   05 32 41.7   +07 05 02     2.499    2.697   90.2   21.9   267   13.6 
2025-09-17 00:00 UT   05 33 29.4   +06 57 12     2.488    2.697   90.8   21.9   268   13.6 
2025-09-18 00:00 UT   05 34 22.6   +06 48 12     2.477    2.698   91.6   21.9   268   13.6 
2025-09-19 00:00 UT   05 35 14.7   +06 39 05     2.466    2.699   92.3   21.8   268   13.6 
2025-09-20 00:00 UT   05 36 05.7   +06 29 52     2.454    2.700   93.0   21.8   268   13.6 
2025-09-21 00:00 UT   05 36 55.5   +06 20 33     2.443    2.701   93.7   21.8   269   13.6 
2025-09-22 00:00 UT   05 37 44.2   +06 11 08     2.431    2.702   94.5   21.7   269   13.6 
2025-09-23 00:00 UT   05 38 31.7   +06 01 36     2.420    2.703   95.2   21.7   269   13.6 
2025-09-24 00:00 UT   05 39 18.1   +05 51 59     2.409    2.704   96.0   21.7   270   13.6 
2025-09-25 00:00 UT   05 40 03.2   +05 42 17     2.398    2.705   96.7   21.6   270   13.5 
2025-09-26 00:00 UT   05 40 47.1   +05 32 28     2.386    2.706   97.5   21.6   270   13.5 
2025-09-27 00:00 UT   05 41 29.8   +05 22 35     2.375    2.707   98.2   21.5   271   13.5 
2025-09-28 00:00 UT   05 42 11.3   +05 12 35     2.364    2.708   99.0   21.4   271   13.5 
2025-09-29 00:00 UT   05 42 51.5   +05 02 31     2.353    2.709   99.7   21.4   271   13.5 
2025-09-30 00:00 UT   05 43 30.4   +04 52 21     2.342    2.710  100.5   21.3   272   13.5 
2025-10-01 00:00 UT   05 44 08.1   +04 42 06     2.331    2.711  101.3   21.2   272   13.5 
2025-10-02 00:00 UT   05 44 44.4   +04 31 47     2.320    2.712  102.0   21.2   273   13.5 
2025-10-03 00:00 UT   05 45 19.5   +04 21 22     2.310    2.713  102.8   21.1   273   13.5 
2025-10-04 00:00 UT   05 45 53.2   +04 10 53     2.299    2.714  103.6   21.0   273   13.4 
2025-10-05 00:00 UT   05 46 25.6   +04 00 19     2.288    2.715  104.4   20.9   274   13.4 
2025-10-06 00:00 UT   05 46 56.7   +03 49 41     2.277    2.716  105.1   20.8   274   13.4 
2025-10-07 00:00 UT   05 47 26.4   +03 38 59     2.267    2.717  105.9   20.7   275   13.4 
2025-10-08 00:00 UT   05 47 54.7   +03 28 13     2.256    2.718  106.7   20.6   275   13.4 
2025-10-09 00:00 UT   05 48 21.6   +03 17 22     2.246    2.719  107.5   20.5   275   13.4 
2025-10-10 00:00 UT   05 48 47.2   +03 06 28     2.236    2.720  108.3   20.4   276   13.4 
2025-10-11 00:00 UT   05 49 11.3   +02 55 31     2.226    2.721  109.1   20.3   276   13.4 
2025-10-12 00:00 UT   05 49 34.0   +02 44 30     2.215    2.722  109.9   20.2   277   13.3 
2025-10-13 00:00 UT   05 49 55.2   +02 33 25     2.205    2.723  110.7   20.0   277   13.3 
2025-10-14 00:00 UT   05 50 15.0   +02 22 18     2.195    2.724  111.5   19.9   278   13.3 
2025-10-15 00:00 UT   05 50 33.4   +02 11 08     2.186    2.726  112.3   19.8   278   13.3 
2025-10-16 00:00 UT   05 50 50.2   +01 59 55     2.176    2.727  113.2   19.6   279   13.3 

    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.