(7) Iris
ephemeris date magn radius delta ra dec elong phase
Today20 Oct 202510.42.156 AU2.470 AU09h49m+09°37'60.2°23.6°
Opposition27 Feb 20268.92.491 AU1.508 AU10h28m-00°04'171.0°3.6°
(7) Iris - 2025-10-20
astro.vanbuitenen.nl


 
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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 Iris are:

            e (Eccentricity)                : 0.2302133
            a (Semimajor axis)              : 2.3865290
            i (Inclination)                 : 5.51881
            Ω (Longitude of ascending node) : 259.49459
            ω (Argument of perihelion)      : 145.48204
            M (Mean anomaly)                : 61.72502
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 225.10082
            B (Latitude of perihelion)      : 3.12403
            P (Orbital period in years)     : 3.69            
        

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
2025-10-20 00:00 UT   09 49 49.9   +09 37 26     2.470    2.156   60.2   23.6   288   10.4 
2025-10-20 20:21 UT   09 51 09.9   +09 28 33     2.463    2.158   60.7   23.7   288   10.4 
2025-10-21 00:00 UT   09 51 24.2   +09 26 57     2.462    2.158   60.8   23.7   288   10.4 
2025-10-22 00:00 UT   09 52 57.7   +09 16 28     2.454    2.161   61.3   23.8   288   10.4 
2025-10-23 00:00 UT   09 54 30.4   +09 06 00     2.446    2.163   61.9   23.9   288   10.4 
2025-10-24 00:00 UT   09 56 02.3   +08 55 33     2.437    2.166   62.5   24.0   288   10.4 
2025-10-25 00:00 UT   09 57 33.5   +08 45 06     2.429    2.168   63.1   24.1   288   10.4 
2025-10-26 00:00 UT   09 59 03.9   +08 34 40     2.421    2.171   63.7   24.2   288   10.4 
2025-10-27 00:00 UT   10 00 33.5   +08 24 15     2.412    2.174   64.3   24.3   289   10.4 
2025-10-28 00:00 UT   10 02 02.4   +08 13 51     2.404    2.176   64.8   24.4   289   10.4 
2025-10-29 00:00 UT   10 03 30.4   +08 03 28     2.395    2.179   65.4   24.5   289   10.4 
2025-10-30 00:00 UT   10 04 57.6   +07 53 07     2.387    2.181   66.0   24.6   289   10.4 
2025-10-31 00:00 UT   10 06 23.9   +07 42 47     2.378    2.184   66.6   24.7   289   10.4 
2025-11-01 00:00 UT   10 07 49.5   +07 32 28     2.370    2.187   67.3   24.7   289   10.4 
2025-11-02 00:00 UT   10 09 14.2   +07 22 11     2.361    2.189   67.9   24.8   289   10.4 
2025-11-03 00:00 UT   10 10 38.1   +07 11 55     2.352    2.192   68.5   24.9   289   10.4 
2025-11-04 00:00 UT   10 12 01.2   +07 01 42     2.343    2.194   69.1   25.0   289   10.4 
2025-11-05 00:00 UT   10 13 23.4   +06 51 30     2.334    2.197   69.7   25.0   289   10.4 
2025-11-06 00:00 UT   10 14 44.8   +06 41 20     2.325    2.200   70.3   25.1   290   10.4 
2025-11-07 00:00 UT   10 16 05.3   +06 31 12     2.316    2.202   71.0   25.2   290   10.4 
2025-11-08 00:00 UT   10 17 24.9   +06 21 06     2.307    2.205   71.6   25.2   290   10.4 
2025-11-09 00:00 UT   10 18 43.6   +06 11 02     2.298    2.208   72.2   25.3   290   10.4 
2025-11-10 00:00 UT   10 20 01.5   +06 01 01     2.289    2.210   72.9   25.4   290   10.4 


    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.