(121) Hermione
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	26 Apr 2024	13.8	3.806 AU	3.386 AU	09h54m	+21°45'	107.1°	14.6°
Opposition	10 Apr 2025	12.9	3.878 AU	2.884 AU	13h29m	-00°40'	171.9°	2.1°

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 Hermione are:

            e (Eccentricity)                : 0.1254444
            a (Semimajor axis)              : 3.4543928
            i (Inclination)                 : 7.56678
            Ω (Longitude of ascending node) : 72.87341
            ω (Argument of perihelion)      : 297.01255
            M (Mean anomaly)                : 135.92801
            Epoch                           : 2024 Mar 31

            L (Longitude of perihelion)     : 10.08925
            B (Latitude of perihelion)      : -6.73723
            P (Orbital period in years)     : 6.42            
        

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
2024-04-26 00:00 UT   09 54 15.1   +21 45 41     3.386    3.806  107.1   14.6   113   13.8 
2024-04-26 11:55 UT   09 54 19.6   +21 44 14     3.393    3.806  106.7   14.7   113   13.8 
2024-04-27 00:00 UT   09 54 24.4   +21 42 45     3.400    3.806  106.2   14.7   113   13.8 
2024-04-28 00:00 UT   09 54 34.8   +21 39 43     3.415    3.807  105.3   14.8   112   13.9 
2024-04-29 00:00 UT   09 54 46.1   +21 36 37     3.430    3.807  104.4   14.8   112   13.9 
2024-04-30 00:00 UT   09 54 58.4   +21 33 26     3.444    3.808  103.5   14.9   112   13.9 
2024-05-01 00:00 UT   09 55 11.6   +21 30 10     3.459    3.809  102.6   15.0   112   13.9 
2024-05-02 00:00 UT   09 55 25.9   +21 26 50     3.474    3.809  101.7   15.0   112   13.9 
2024-05-03 00:00 UT   09 55 41.1   +21 23 25     3.489    3.810  100.9   15.1   112   13.9 
2024-05-04 00:00 UT   09 55 57.3   +21 19 56     3.504    3.810  100.0   15.1   112   13.9 
2024-05-05 00:00 UT   09 56 14.5   +21 16 22     3.519    3.811   99.1   15.1   111   13.9 
2024-05-06 00:00 UT   09 56 32.5   +21 12 44     3.534    3.812   98.2   15.2   111   13.9 
2024-05-07 00:00 UT   09 56 51.5   +21 09 01     3.549    3.812   97.4   15.2   111   14.0 
2024-05-08 00:00 UT   09 57 11.4   +21 05 15     3.564    3.813   96.5   15.2   111   14.0 
2024-05-09 00:00 UT   09 57 32.3   +21 01 24     3.580    3.813   95.6   15.3   111   14.0 
2024-05-10 00:00 UT   09 57 54.0   +20 57 29     3.595    3.814   94.8   15.3   111   14.0 
2024-05-11 00:00 UT   09 58 16.6   +20 53 30     3.610    3.815   93.9   15.3   111   14.0 
2024-05-12 00:00 UT   09 58 40.1   +20 49 28     3.625    3.815   93.1   15.3   111   14.0 
2024-05-13 00:00 UT   09 59 04.5   +20 45 21     3.640    3.816   92.2   15.3   111   14.0 
2024-05-14 00:00 UT   09 59 29.7   +20 41 10     3.655    3.816   91.4   15.4   111   14.0 
2024-05-15 00:00 UT   09 59 55.7   +20 36 56     3.671    3.817   90.6   15.4   110   14.0 
2024-05-16 00:00 UT   10 00 22.5   +20 32 38     3.686    3.817   89.7   15.4   110   14.0 
2024-05-17 00:00 UT   10 00 50.2   +20 28 16     3.701    3.818   88.9   15.4   110   14.1 
2024-05-18 00:00 UT   10 01 18.7   +20 23 51     3.716    3.819   88.1   15.4   110   14.1 
2024-05-19 00:00 UT   10 01 47.9   +20 19 22     3.731    3.819   87.3   15.3   110   14.1 
2024-05-20 00:00 UT   10 02 17.9   +20 14 50     3.747    3.820   86.4   15.3   110   14.1 
2024-05-21 00:00 UT   10 02 48.7   +20 10 15     3.762    3.820   85.6   15.3   110   14.1 
2024-05-22 00:00 UT   10 03 20.2   +20 05 36     3.777    3.821   84.8   15.3   110   14.1 
2024-05-23 00:00 UT   10 03 52.5   +20 00 53     3.792    3.821   84.0   15.3   110   14.1 
2024-05-24 00:00 UT   10 04 25.5   +19 56 08     3.807    3.822   83.2   15.3   110   14.1 
2024-05-25 00:00 UT   10 04 59.2   +19 51 19     3.822    3.823   82.4   15.2   110   14.1 
2024-05-26 00:00 UT   10 05 33.6   +19 46 27     3.837    3.823   81.6   15.2   110   14.1 

    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.