(82) Alkmene
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	16 Sep 2025	13.2	2.396 AU	2.417 AU	06h27m	+25°19'	76.8°	24.1°
Opposition	6 Jan 2026	10.7	2.205 AU	1.224 AU	07h16m	+27°20'	174.8°	2.3°

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 Alkmene are:

            e (Eccentricity)                : 0.2209750
            a (Semimajor axis)              : 2.7624821
            i (Inclination)                 : 2.82605
            Ω (Longitude of ascending node) : 25.42646
            ω (Argument of perihelion)      : 110.83411
            M (Mean anomaly)                : 288.26371
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : -43.71624
            B (Latitude of perihelion)      : 2.64113
            P (Orbital period in years)     : 4.59            
        

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
2025-09-16 00:00 UT   06 27 51.3   +25 19 41     2.417    2.396   76.8   24.1   273   13.2 
2025-09-16 21:50 UT   06 29 17.9   +25 19 46     2.405    2.394   77.3   24.2   273   13.2 
2025-09-17 00:00 UT   06 29 26.5   +25 19 46     2.404    2.394   77.4   24.2   273   13.2 
2025-09-18 00:00 UT   06 31 01.1   +25 19 50     2.390    2.392   78.0   24.3   274   13.2 
2025-09-19 00:00 UT   06 32 35.2   +25 19 50     2.376    2.390   78.6   24.3   274   13.2 
2025-09-20 00:00 UT   06 34 08.6   +25 19 49     2.362    2.388   79.2   24.4   274   13.2 
2025-09-21 00:00 UT   06 35 41.4   +25 19 46     2.348    2.385   79.9   24.5   274   13.1 
2025-09-22 00:00 UT   06 37 13.6   +25 19 40     2.334    2.383   80.5   24.5   274   13.1 
2025-09-23 00:00 UT   06 38 45.1   +25 19 33     2.320    2.381   81.1   24.6   274   13.1 
2025-09-24 00:00 UT   06 40 15.9   +25 19 23     2.306    2.379   81.8   24.7   274   13.1 
2025-09-25 00:00 UT   06 41 46.0   +25 19 12     2.292    2.377   82.4   24.7   274   13.1 
2025-09-26 00:00 UT   06 43 15.5   +25 18 60     2.278    2.375   83.0   24.8   275   13.1 
2025-09-27 00:00 UT   06 44 44.2   +25 18 45     2.264    2.373   83.7   24.8   275   13.1 
2025-09-28 00:00 UT   06 46 12.2   +25 18 29     2.250    2.371   84.3   24.9   275   13.0 
2025-09-29 00:00 UT   06 47 39.5   +25 18 12     2.236    2.369   85.0   24.9   275   13.0 
2025-09-30 00:00 UT   06 49 06.0   +25 17 54     2.222    2.367   85.7   25.0   275   13.0 
2025-10-01 00:00 UT   06 50 31.7   +25 17 35     2.208    2.365   86.3   25.0   275   13.0 
2025-10-02 00:00 UT   06 51 56.6   +25 17 14     2.194    2.363   87.0   25.0   275   13.0 
2025-10-03 00:00 UT   06 53 20.7   +25 16 53     2.180    2.361   87.6   25.1   275   13.0 
2025-10-04 00:00 UT   06 54 44.0   +25 16 30     2.166    2.359   88.3   25.1   275   13.0 
2025-10-05 00:00 UT   06 56 06.5   +25 16 07     2.152    2.357   89.0   25.1   276   12.9 
2025-10-06 00:00 UT   06 57 28.1   +25 15 44     2.138    2.355   89.7   25.1   276   12.9 
2025-10-07 00:00 UT   06 58 48.8   +25 15 20     2.124    2.353   90.3   25.1   276   12.9 
2025-10-08 00:00 UT   07 00 08.7   +25 14 55     2.110    2.351   91.0   25.1   276   12.9 
2025-10-09 00:00 UT   07 01 27.6   +25 14 30     2.096    2.349   91.7   25.2   276   12.9 
2025-10-10 00:00 UT   07 02 45.6   +25 14 06     2.082    2.347   92.4   25.2   276   12.9 
2025-10-11 00:00 UT   07 04 02.7   +25 13 41     2.068    2.345   93.1   25.2   276   12.8 
2025-10-12 00:00 UT   07 05 18.8   +25 13 16     2.054    2.343   93.8   25.2   276   12.8 

    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.