(204) Kallisto
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	12 Jul 2025	14.7	2.919 AU	3.872 AU	08h27m	+12°58'	17.5°	6.0°
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
2025-07-12 00:00 UT   08 27 46.9   +12 58 18     3.872    2.919   17.5    6.0   123   14.7 
2025-07-12 07:44 UT   08 28 16.2   +12 56 46     3.873    2.918   17.3    6.0   123   14.7 
2025-07-13 00:00 UT   08 29 18.0   +12 53 33     3.874    2.917   17.0    5.8   124   14.7 
2025-07-14 00:00 UT   08 30 49.1   +12 48 44     3.876    2.916   16.4    5.7   125   14.7 
2025-07-15 00:00 UT   08 32 20.3   +12 43 51     3.879    2.914   15.9    5.5   126   14.7 
2025-07-16 00:00 UT   08 33 51.5   +12 38 54     3.880    2.913   15.4    5.3   127   14.7 
2025-07-17 00:00 UT   08 35 22.9   +12 33 53     3.882    2.911   14.8    5.1   127   14.7 
2025-07-18 00:00 UT   08 36 54.3   +12 28 48     3.884    2.910   14.3    5.0   128   14.7 
2025-07-19 00:00 UT   08 38 25.8   +12 23 39     3.885    2.909   13.8    4.8   130   14.7 
2025-07-20 00:00 UT   08 39 57.3   +12 18 26     3.887    2.907   13.3    4.6   131   14.6 
2025-07-21 00:00 UT   08 41 28.9   +12 13 09     3.888    2.906   12.8    4.4   132   14.6 
2025-07-22 00:00 UT   08 43 00.5   +12 07 48     3.889    2.904   12.3    4.3   133   14.6 
2025-07-23 00:00 UT   08 44 32.2   +12 02 24     3.890    2.903   11.8    4.1   135   14.6 
2025-07-24 00:00 UT   08 46 04.0   +11 56 55     3.891    2.901   11.3    3.9   136   14.6 
2025-07-25 00:00 UT   08 47 35.7   +11 51 23     3.891    2.900   10.8    3.8   138   14.6 
2025-07-26 00:00 UT   08 49 07.5   +11 45 47     3.892    2.898   10.3    3.6   140   14.6 
2025-07-27 00:00 UT   08 50 39.4   +11 40 08     3.892    2.897    9.8    3.4   142   14.6 
2025-07-28 00:00 UT   08 52 11.3   +11 34 24     3.892    2.895    9.4    3.3   144   14.6 
2025-07-29 00:00 UT   08 53 43.2   +11 28 37     3.892    2.894    8.9    3.1   146   14.6 
2025-07-30 00:00 UT   08 55 15.1   +11 22 46     3.892    2.892    8.5    3.0   149   14.5 
2025-07-31 00:00 UT   08 56 47.0   +11 16 52     3.892    2.891    8.1    2.8   151   14.5 
2025-08-01 00:00 UT   08 58 18.9   +11 10 54     3.892    2.889    7.7    2.7   154   14.5 
2025-08-02 00:00 UT   08 59 50.9   +11 04 52     3.891    2.888    7.3    2.6   158   14.5 
2025-08-03 00:00 UT   09 01 22.8   +10 58 47     3.891    2.886    7.0    2.4   162   14.5 

    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.