(121) Hermione
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	8 Nov 2025	13.8	3.781 AU	4.770 AU	14h59m	-14°15'	2.9°	0.7°
Opposition	5 Jun 2026	12.3	3.595 AU	2.580 AU	16h52m	-22°51'	179.7°	0.1°

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)                : 0.1246355
            a (Semimajor axis)              : 3.4569988
            i (Inclination)                 : 7.56630
            Ω (Longitude of ascending node) : 72.87519
            ω (Argument of perihelion)      : 297.01608
            M (Mean anomaly)                : 227.97435
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 10.09455
            B (Latitude of perihelion)      : -6.73659
            P (Orbital period in years)     : 6.43            
        

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
2025-11-08 00:00 UT   14 59 29.1   -14 15 05     4.770    3.781    2.9    0.7    39   13.8 
2025-11-08 20:48 UT   15 00 31.9   -14 20 12     4.770    3.780    2.7    0.7    27   13.8 
2025-11-09 00:00 UT   15 00 41.6   -14 20 59     4.769    3.780    2.7    0.7    25   13.8 
2025-11-10 00:00 UT   15 01 54.2   -14 26 52     4.769    3.779    2.6    0.7     9   13.8 
2025-11-11 00:00 UT   15 03 06.9   -14 32 42     4.767    3.779    2.8    0.7   355   13.8 
2025-11-12 00:00 UT   15 04 19.7   -14 38 31     4.766    3.778    3.1    0.8   343   13.8 
2025-11-13 00:00 UT   15 05 32.7   -14 44 18     4.765    3.777    3.5    0.9   333   13.8 
2025-11-14 00:00 UT   15 06 45.7   -14 50 03     4.763    3.777    4.0    1.1   326   13.8 
2025-11-15 00:00 UT   15 07 58.8   -14 55 46     4.761    3.776    4.6    1.2   320   13.8 
2025-11-16 00:00 UT   15 09 11.9   -15 01 27     4.759    3.775    5.2    1.4   315   13.9 
2025-11-17 00:00 UT   15 10 25.2   -15 07 06     4.757    3.774    5.8    1.5   312   13.9 
2025-11-18 00:00 UT   15 11 38.5   -15 12 43     4.755    3.774    6.4    1.7   309   13.9 
2025-11-19 00:00 UT   15 12 51.9   -15 18 18     4.752    3.773    7.0    1.8   306   13.9 
2025-11-20 00:00 UT   15 14 05.3   -15 23 51     4.749    3.772    7.7    2.0   304   13.9 
2025-11-21 00:00 UT   15 15 18.8   -15 29 22     4.746    3.772    8.4    2.2   302   13.9 
2025-11-22 00:00 UT   15 16 32.4   -15 34 51     4.743    3.771    9.0    2.4   301   13.9 
2025-11-23 00:00 UT   15 17 46.0   -15 40 18     4.740    3.770    9.7    2.5   300   13.9 
2025-11-24 00:00 UT   15 18 59.6   -15 45 43     4.737    3.769   10.4    2.7   298   13.9 
2025-11-25 00:00 UT   15 20 13.2   -15 51 05     4.733    3.769   11.1    2.9   297   14.0 
2025-11-26 00:00 UT   15 21 26.9   -15 56 25     4.729    3.768   11.7    3.1   297   14.0 
2025-11-27 00:00 UT   15 22 40.6   -16 01 43     4.725    3.767   12.4    3.2   296   14.0 
2025-11-28 00:00 UT   15 23 54.3   -16 06 59     4.721    3.767   13.1    3.4   295   14.0 
2025-11-29 00:00 UT   15 25 08.1   -16 12 12     4.716    3.766   13.8    3.6   294   14.0 
2025-11-30 00:00 UT   15 26 21.8   -16 17 23     4.712    3.765   14.5    3.8   294   14.0 
2025-12-01 00:00 UT   15 27 35.5   -16 22 32     4.707    3.764   15.2    3.9   293   14.0 
2025-12-02 00:00 UT   15 28 49.2   -16 27 38     4.702    3.764   15.9    4.1   292   14.0 
2025-12-03 00:00 UT   15 30 02.9   -16 32 42     4.697    3.763   16.6    4.3   292   14.0 
2025-12-04 00:00 UT   15 31 16.6   -16 37 44     4.692    3.762   17.3    4.5   291   14.0 
2025-12-05 00:00 UT   15 32 30.3   -16 42 43     4.686    3.761   18.0    4.6   291   14.0 

    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.