(22) Kalliope
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	13 May 2025	12.6	2.925 AU	3.143 AU	23h22m	-17°41'	68.4°	18.7°
Opposition	13 Sep 2025	10.9	2.803 AU	1.838 AU	00h02m	-22°08'	159.5°	7.2°

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 Kalliope are:

            e (Eccentricity)                : 0.0989148
            a (Semimajor axis)              : 2.9100537
            i (Inclination)                 : 13.70152
            Ω (Longitude of ascending node) : 65.97105
            ω (Argument of perihelion)      : 358.12033
            M (Mean anomaly)                : 271.06605
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 64.14483
            B (Latitude of perihelion)      : -0.44515
            P (Orbital period in years)     : 4.96            
        

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
2025-05-13 00:00 UT   23 22 22.1   -17 41 06     3.143    2.925   68.4   18.7   241   12.6 
2025-05-13 06:20 UT   23 22 41.8   -17 40 01     3.139    2.925   68.5   18.8   241   12.6 
2025-05-14 00:00 UT   23 23 36.6   -17 37 02     3.130    2.924   69.0   18.8   241   12.6 
2025-05-15 00:00 UT   23 24 50.5   -17 33 02     3.116    2.923   69.7   18.9   241   12.6 
2025-05-16 00:00 UT   23 26 04.0   -17 29 07     3.103    2.922   70.3   19.0   242   12.6 
2025-05-17 00:00 UT   23 27 17.0   -17 25 16     3.090    2.921   71.0   19.1   242   12.5 
2025-05-18 00:00 UT   23 28 29.5   -17 21 30     3.077    2.920   71.6   19.2   242   12.5 
2025-05-19 00:00 UT   23 29 41.5   -17 17 49     3.064    2.919   72.3   19.3   242   12.5 
2025-05-20 00:00 UT   23 30 53.0   -17 14 12     3.050    2.918   72.9   19.4   242   12.5 
2025-05-21 00:00 UT   23 32 04.0   -17 10 41     3.037    2.917   73.6   19.4   242   12.5 
2025-05-22 00:00 UT   23 33 14.4   -17 07 15     3.023    2.916   74.3   19.5   242   12.5 
2025-05-23 00:00 UT   23 34 24.3   -17 03 53     3.010    2.915   74.9   19.6   242   12.5 
2025-05-24 00:00 UT   23 35 33.6   -17 00 37     2.996    2.914   75.6   19.7   243   12.5 
2025-05-25 00:00 UT   23 36 42.4   -16 57 27     2.983    2.913   76.2   19.7   243   12.5 
2025-05-26 00:00 UT   23 37 50.6   -16 54 21     2.969    2.912   76.9   19.8   243   12.5 
2025-05-27 00:00 UT   23 38 58.3   -16 51 22     2.956    2.911   77.6   19.9   243   12.5 
2025-05-28 00:00 UT   23 40 05.3   -16 48 28     2.942    2.910   78.3   19.9   243   12.5 
2025-05-29 00:00 UT   23 41 11.7   -16 45 39     2.929    2.909   78.9   20.0   243   12.5 
2025-05-30 00:00 UT   23 42 17.6   -16 42 57     2.915    2.908   79.6   20.0   243   12.4 
2025-05-31 00:00 UT   23 43 22.8   -16 40 20     2.901    2.907   80.3   20.1   244   12.4 
2025-06-01 00:00 UT   23 44 27.3   -16 37 49     2.887    2.906   81.0   20.2   244   12.4 
2025-06-02 00:00 UT   23 45 31.3   -16 35 24     2.874    2.905   81.7   20.2   244   12.4 
2025-06-03 00:00 UT   23 46 34.6   -16 33 05     2.860    2.904   82.3   20.2   244   12.4 
2025-06-04 00:00 UT   23 47 37.3   -16 30 53     2.846    2.903   83.0   20.3   244   12.4 
2025-06-05 00:00 UT   23 48 39.3   -16 28 46     2.832    2.902   83.7   20.3   244   12.4 
2025-06-06 00:00 UT   23 49 40.6   -16 26 46     2.819    2.901   84.4   20.4   244   12.4 
2025-06-07 00:00 UT   23 50 41.2   -16 24 52     2.805    2.900   85.1   20.4   245   12.4 
2025-06-08 00:00 UT   23 51 41.2   -16 23 05     2.791    2.899   85.8   20.4   245   12.4 
2025-06-09 00:00 UT   23 52 40.5   -16 21 24     2.777    2.898   86.5   20.5   245   12.3 
2025-06-10 00:00 UT   23 53 39.0   -16 19 50     2.764    2.897   87.2   20.5   245   12.3 
2025-06-11 00:00 UT   23 54 36.9   -16 18 22     2.750    2.896   87.9   20.5   245   12.3 
2025-06-12 00:00 UT   23 55 34.0   -16 17 01     2.736    2.895   88.6   20.5   245   12.3 

    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.