(204) Kallisto
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	28 May 2025	14.9	2.979 AU	3.628 AU	07h22m	+15°19'	43.7°	13.6°
Opposition	29 Mar 2026	12.0	2.461 AU	1.464 AU	12h28m	-07°13'	176.1°	1.6°

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 Kallisto are:

            e (Eccentricity)                : 0.1757488
            a (Semimajor axis)              : 2.6710611
            i (Inclination)                 : 8.26953
            Ω (Longitude of ascending node) : 204.92267
            ω (Argument of perihelion)      : 56.79120
            M (Mean anomaly)                : 231.36275
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 261.43888
            B (Latitude of perihelion)      : 6.91171
            P (Orbital period in years)     : 4.37            
        

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
2025-05-28 00:00 UT   07 22 04.4   +15 19 28     3.628    2.979   43.7   13.6   105   14.9 
2025-05-28 04:57 UT   07 22 21.4   +15 19 09     3.630    2.979   43.6   13.6   105   14.9 
2025-05-29 00:00 UT   07 23 26.9   +15 17 54     3.636    2.978   43.1   13.4   105   14.9 
2025-05-30 00:00 UT   07 24 49.8   +15 16 17     3.644    2.977   42.5   13.3   106   14.9 
2025-05-31 00:00 UT   07 26 13.0   +15 14 35     3.652    2.976   41.9   13.1   106   14.9 
2025-06-01 00:00 UT   07 27 36.4   +15 12 48     3.660    2.974   41.3   13.0   106   14.9 
2025-06-02 00:00 UT   07 29 00.2   +15 10 58     3.668    2.973   40.7   12.8   106   14.9 
2025-06-03 00:00 UT   07 30 24.3   +15 09 02     3.676    2.972   40.0   12.7   107   14.9 
2025-06-04 00:00 UT   07 31 48.7   +15 07 03     3.683    2.970   39.4   12.5   107   14.9 
2025-06-05 00:00 UT   07 33 13.3   +15 04 59     3.691    2.969   38.8   12.4   107   14.9 
2025-06-06 00:00 UT   07 34 38.2   +15 02 51     3.698    2.968   38.2   12.2   108   14.9 
2025-06-07 00:00 UT   07 36 03.4   +15 00 39     3.705    2.967   37.6   12.1   108   14.9 
2025-06-08 00:00 UT   07 37 28.8   +14 58 22     3.712    2.965   37.0   11.9   108   14.9 
2025-06-09 00:00 UT   07 38 54.4   +14 56 01     3.719    2.964   36.4   11.7   108   14.9 
2025-06-10 00:00 UT   07 40 20.4   +14 53 36     3.726    2.963   35.8   11.6   109   14.9 
2025-06-11 00:00 UT   07 41 46.5   +14 51 06     3.732    2.961   35.2   11.4   109   14.9 
2025-06-12 00:00 UT   07 43 12.9   +14 48 32     3.739    2.960   34.6   11.2   109   14.9 
2025-06-13 00:00 UT   07 44 39.5   +14 45 54     3.745    2.959   34.0   11.1   110   14.9 
2025-06-14 00:00 UT   07 46 06.3   +14 43 11     3.751    2.957   33.4   10.9   110   14.9 
2025-06-15 00:00 UT   07 47 33.4   +14 40 24     3.757    2.956   32.9   10.7   110   14.9 
2025-06-16 00:00 UT   07 49 00.6   +14 37 33     3.763    2.955   32.3   10.6   111   14.9 
2025-06-17 00:00 UT   07 50 28.1   +14 34 37     3.769    2.953   31.7   10.4   111   14.9 
2025-06-18 00:00 UT   07 51 55.8   +14 31 37     3.775    2.952   31.1   10.2   111   14.9 
2025-06-19 00:00 UT   07 53 23.6   +14 28 33     3.781    2.951   30.5   10.1   112   14.9 
2025-06-20 00:00 UT   07 54 51.7   +14 25 24     3.786    2.949   29.9    9.9   112   14.9 
2025-06-21 00:00 UT   07 56 19.9   +14 22 11     3.791    2.948   29.3    9.7   112   14.9 

    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.