(204) Kallisto
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	22 Oct 2025	14.6	2.754 AU	3.403 AU	11h00m	+00°31'	42.6°	14.2°
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)                : 0.1760366
            a (Semimajor axis)              : 2.6698134
            i (Inclination)                 : 8.27072
            Ω (Longitude of ascending node) : 204.89762
            ω (Argument of perihelion)      : 56.95546
            M (Mean anomaly)                : 276.40040
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 261.57869
            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
2025-10-22 00:00 UT   11 00 52.3   +00 31 11     3.403    2.754   42.6   14.2   287   14.6 
2025-10-22 20:35 UT   11 02 04.9   +00 23 37     3.394    2.752   43.1   14.3   287   14.6 
2025-10-23 00:00 UT   11 02 16.9   +00 22 22     3.392    2.752   43.2   14.3   287   14.6 
2025-10-24 00:00 UT   11 03 41.3   +00 13 32     3.381    2.750   43.8   14.5   287   14.6 
2025-10-25 00:00 UT   11 05 05.5   +00 04 43     3.370    2.749   44.4   14.7   287   14.6 
2025-10-26 00:00 UT   11 06 29.5   +00 04 06     3.358    2.747   45.0   14.8   288   14.6 
2025-10-27 00:00 UT   11 07 53.2   +00 12 56     3.347    2.745   45.6   15.0   288   14.6 
2025-10-28 00:00 UT   11 09 16.8   +00 21 45     3.335    2.743   46.2   15.2   288   14.6 
2025-10-29 00:00 UT   11 10 40.1   +00 30 33     3.323    2.741   46.8   15.3   288   14.6 
2025-10-30 00:00 UT   11 12 03.1   +00 39 21     3.312    2.740   47.5   15.5   288   14.6 
2025-10-31 00:00 UT   11 13 26.0   +00 48 09     3.300    2.738   48.1   15.7   288   14.6 
2025-11-01 00:00 UT   11 14 48.6   +00 56 57     3.288    2.736   48.7   15.8   288   14.6 
2025-11-02 00:00 UT   11 16 10.9   -01 05 44     3.276    2.734   49.3   16.0   288   14.6 
2025-11-03 00:00 UT   11 17 33.0   -01 14 30     3.263    2.732   49.9   16.1   289   14.6 
2025-11-04 00:00 UT   11 18 54.9   -01 23 16     3.251    2.731   50.6   16.3   289   14.6 
2025-11-05 00:00 UT   11 20 16.5   -01 32 01     3.239    2.729   51.2   16.4   289   14.6 
2025-11-06 00:00 UT   11 21 37.8   -01 40 45     3.226    2.727   51.8   16.6   289   14.6 
2025-11-07 00:00 UT   11 22 58.9   -01 49 28     3.214    2.725   52.4   16.8   289   14.6 
2025-11-08 00:00 UT   11 24 19.7   -01 58 11     3.201    2.723   53.1   16.9   289   14.6 
2025-11-09 00:00 UT   11 25 40.3   -02 06 53     3.188    2.722   53.7   17.1   289   14.6 
2025-11-10 00:00 UT   11 27 00.6   -02 15 34     3.175    2.720   54.3   17.2   289   14.6 
2025-11-11 00:00 UT   11 28 20.6   -02 24 13     3.163    2.718   55.0   17.4   290   14.6 
2025-11-12 00:00 UT   11 29 40.3   -02 32 52     3.150    2.716   55.6   17.5   290   14.6 
2025-11-13 00:00 UT   11 30 59.7   -02 41 29     3.136    2.714   56.3   17.6   290   14.6 

    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.