(204) Kallisto
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	30 May 2026	13.1	2.356 AU	1.751 AU	12h09m	-00°52'	114.3°	23.1°
Opposition	9 Sep 2027	12.3	2.546 AU	1.545 AU	22h59m	+02°45'	171.5°	3.4°

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)                : 0.1760366
            a (Semimajor axis)              : 2.6698134
            i (Inclination)                 : 8.27072
            Ω (Longitude of ascending node) : 204.89762
            ω (Argument of perihelion)      : 56.95547
            M (Mean anomaly)                : 276.40040
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 261.57870
            B (Latitude of perihelion)      : 6.92571
            P (Orbital period in years)     : 4.36            
        

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
2026-05-30 00:00 UT   12 09 29.9   +00 52 44     1.751    2.356  114.3   23.1   113   13.1 
2026-05-30 00:48 UT   12 09 30.8   +00 52 42     1.751    2.356  114.2   23.1   113   13.1 
2026-05-31 00:00 UT   12 09 57.1   +00 52 08     1.761    2.355  113.4   23.3   113   13.2 
2026-06-01 00:00 UT   12 10 25.7   +00 51 44     1.770    2.353  112.6   23.4   114   13.2 
2026-06-02 00:00 UT   12 10 55.8   +00 51 31     1.780    2.352  111.7   23.6   114   13.2 
2026-06-03 00:00 UT   12 11 27.2   +00 51 30     1.789    2.350  110.9   23.8   114   13.2 
2026-06-04 00:00 UT   12 12 00.0   +00 51 40     1.799    2.349  110.0   23.9   114   13.2 
2026-06-05 00:00 UT   12 12 34.2   +00 52 01     1.809    2.347  109.2   24.1   114   13.2 
2026-06-06 00:00 UT   12 13 09.8   +00 52 33     1.819    2.346  108.4   24.2   114   13.3 
2026-06-07 00:00 UT   12 13 46.7   +00 53 16     1.829    2.344  107.6   24.4   114   13.3 
2026-06-08 00:00 UT   12 14 24.9   +00 54 10     1.838    2.343  106.8   24.5   114   13.3 
2026-06-09 00:00 UT   12 15 04.4   +00 55 15     1.848    2.341  106.0   24.6   114   13.3 
2026-06-10 00:00 UT   12 15 45.2   +00 56 30     1.858    2.340  105.2   24.8   114   13.3 
2026-06-11 00:00 UT   12 16 27.3   +00 57 55     1.869    2.338  104.4   24.9   114   13.3 
2026-06-12 00:00 UT   12 17 10.6   +00 59 31     1.879    2.337  103.6   25.0   114   13.3 
2026-06-13 00:00 UT   12 17 55.2   -01 01 16     1.889    2.335  102.9   25.1   114   13.3 
2026-06-14 00:00 UT   12 18 41.1   -01 03 12     1.899    2.334  102.1   25.2   114   13.4 
2026-06-15 00:00 UT   12 19 28.1   -01 05 18     1.909    2.332  101.3   25.3   114   13.4 
2026-06-16 00:00 UT   12 20 16.4   -01 07 34     1.920    2.331  100.6   25.4   114   13.4 
2026-06-17 00:00 UT   12 21 05.8   -01 09 59     1.930    2.329   99.8   25.5   114   13.4 
2026-06-18 00:00 UT   12 21 56.5   -01 12 34     1.940    2.328   99.1   25.5   113   13.4 
2026-06-19 00:00 UT   12 22 48.2   -01 15 18     1.951    2.326   98.3   25.6   113   13.4 
2026-06-20 00:00 UT   12 23 41.2   -01 18 11     1.961    2.325   97.6   25.7   113   13.4 
2026-06-21 00:00 UT   12 24 35.2   -01 21 13     1.971    2.323   96.9   25.7   113   13.4 
2026-06-22 00:00 UT   12 25 30.3   -01 24 24     1.982    2.322   96.2   25.8   113   13.5 
2026-06-23 00:00 UT   12 26 26.5   -01 27 43     1.992    2.321   95.4   25.8   113   13.5 
2026-06-24 00:00 UT   12 27 23.8   -01 31 11     2.002    2.319   94.7   25.9   113   13.5 
2026-06-25 00:00 UT   12 28 22.1   -01 34 48     2.013    2.318   94.0   25.9   113   13.5 
2026-06-26 00:00 UT   12 29 21.5   -01 38 33     2.023    2.316   93.3   26.0   113   13.5 
2026-06-27 00:00 UT   12 30 21.8   -01 42 25     2.034    2.315   92.6   26.0   113   13.5 
2026-06-28 00:00 UT   12 31 23.2   -01 46 26     2.044    2.313   91.9   26.0   113   13.5 
2026-06-29 00:00 UT   12 32 25.5   -01 50 34     2.055    2.312   91.2   26.1   113   13.5 

    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.