(204) Kallisto
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	1 Aug 2026	13.8	2.270 AU	2.392 AU	13h14m	-05°05'	70.7°	25.0°
Opposition	9 Sep 2027	12.3	2.545 AU	1.545 AU	23h00m	+02°46'	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)                : 0.1761360
            a (Semimajor axis)              : 2.6696947
            i (Inclination)                 : 8.27108
            Ω (Longitude of ascending node) : 204.89541
            ω (Argument of perihelion)      : 56.98947
            M (Mean anomaly)                : 321.57039
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 261.61061
            B (Latitude of perihelion)      : 6.92869
            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
2026-08-01 00:00 UT   13 14 37.3   -05 05 13     2.392    2.270   70.7   25.0   111   13.8 
2026-08-01 09:11 UT   13 15 11.3   -05 07 59     2.396    2.269   70.5   24.9   111   13.8 
2026-08-02 00:00 UT   13 16 06.3   -05 12 27     2.402    2.269   70.2   24.9   111   13.8 
2026-08-03 00:00 UT   13 17 36.0   -05 19 44     2.412    2.268   69.6   24.8   111   13.8 
2026-08-04 00:00 UT   13 19 06.2   -05 27 05     2.422    2.267   69.0   24.7   111   13.8 
2026-08-05 00:00 UT   13 20 37.1   -05 34 29     2.431    2.265   68.5   24.6   111   13.8 
2026-08-06 00:00 UT   13 22 08.6   -05 41 55     2.441    2.264   67.9   24.5   111   13.8 
2026-08-07 00:00 UT   13 23 40.7   -05 49 25     2.451    2.263   67.4   24.4   111   13.8 
2026-08-08 00:00 UT   13 25 13.4   -05 56 57     2.460    2.262   66.8   24.3   111   13.8 
2026-08-09 00:00 UT   13 26 46.7   -06 04 32     2.470    2.261   66.3   24.2   110   13.8 
2026-08-10 00:00 UT   13 28 20.6   -06 12 09     2.479    2.260   65.7   24.1   110   13.8 
2026-08-11 00:00 UT   13 29 55.1   -06 19 49     2.489    2.259   65.2   24.0   110   13.8 
2026-08-12 00:00 UT   13 31 30.1   -06 27 31     2.498    2.258   64.6   23.9   110   13.8 
2026-08-13 00:00 UT   13 33 05.7   -06 35 15     2.507    2.257   64.1   23.8   110   13.8 
2026-08-14 00:00 UT   13 34 41.9   -06 43 02     2.517    2.256   63.5   23.7   110   13.8 
2026-08-15 00:00 UT   13 36 18.7   -06 50 50     2.526    2.255   63.0   23.6   110   13.8 
2026-08-16 00:00 UT   13 37 56.0   -06 58 41     2.535    2.254   62.5   23.5   110   13.9 
2026-08-17 00:00 UT   13 39 33.9   -07 06 33     2.544    2.253   61.9   23.4   110   13.9 
2026-08-18 00:00 UT   13 41 12.3   -07 14 27     2.553    2.252   61.4   23.3   109   13.9 
2026-08-19 00:00 UT   13 42 51.2   -07 22 22     2.562    2.251   60.9   23.1   109   13.9 
2026-08-20 00:00 UT   13 44 30.7   -07 30 18     2.571    2.250   60.3   23.0   109   13.9 
2026-08-21 00:00 UT   13 46 10.7   -07 38 16     2.580    2.249   59.8   22.9   109   13.9 

    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.