(121) Hermione
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	29 Nov 2025	14.0	3.766 AU	4.716 AU	15h25m	-16°12'	13.8°	3.6°
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
2025-11-29 00:00 UT   15 25 08.1   -16 12 12     4.716    3.766   13.8    3.6   294   14.0 
2025-11-29 21:21 UT   15 26 13.6   -16 16 49     4.712    3.765   14.4    3.7   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 
2025-12-06 00:00 UT   15 33 43.9   -16 47 40     4.681    3.761   18.7    4.8   291   14.0 
2025-12-07 00:00 UT   15 34 57.5   -16 52 35     4.675    3.760   19.4    5.0   290   14.0 
2025-12-08 00:00 UT   15 36 11.1   -16 57 27     4.669    3.759   20.1    5.2   290   14.1 
2025-12-09 00:00 UT   15 37 24.7   -17 02 17     4.663    3.758   20.8    5.3   289   14.1 
2025-12-10 00:00 UT   15 38 38.2   -17 07 05     4.656    3.758   21.5    5.5   289   14.1 
2025-12-11 00:00 UT   15 39 51.6   -17 11 50     4.650    3.757   22.2    5.7   289   14.1 
2025-12-12 00:00 UT   15 41 05.0   -17 16 32     4.643    3.756   22.9    5.9   288   14.1 
2025-12-13 00:00 UT   15 42 18.3   -17 21 12     4.636    3.755   23.6    6.0   288   14.1 
2025-12-14 00:00 UT   15 43 31.6   -17 25 50     4.629    3.754   24.4    6.2   288   14.1 
2025-12-15 00:00 UT   15 44 44.8   -17 30 25     4.622    3.754   25.1    6.4   288   14.1 
2025-12-16 00:00 UT   15 45 57.8   -17 34 57     4.615    3.753   25.8    6.6   287   14.1 
2025-12-17 00:00 UT   15 47 10.9   -17 39 27     4.607    3.752   26.5    6.7   287   14.1 
2025-12-18 00:00 UT   15 48 23.8   -17 43 55     4.599    3.751   27.2    6.9   287   14.1 
2025-12-19 00:00 UT   15 49 36.6   -17 48 19     4.592    3.751   27.9    7.1   287   14.1 
2025-12-20 00:00 UT   15 50 49.3   -17 52 42     4.584    3.750   28.6    7.2   286   14.1 
2025-12-21 00:00 UT   15 52 01.8   -17 57 01     4.575    3.749   29.4    7.4   286   14.1 
2025-12-22 00:00 UT   15 53 14.3   -18 01 19     4.567    3.748   30.1    7.6   286   14.1 
2025-12-23 00:00 UT   15 54 26.6   -18 05 33     4.558    3.747   30.8    7.7   286   14.1 
2025-12-24 00:00 UT   15 55 38.7   -18 09 45     4.550    3.747   31.5    7.9   285   14.1 
2025-12-25 00:00 UT   15 56 50.8   -18 13 54     4.541    3.746   32.3    8.1   285   14.1 
2025-12-26 00:00 UT   15 58 02.6   -18 18 01     4.532    3.745   33.0    8.2   285   14.1 
2025-12-27 00:00 UT   15 59 14.3   -18 22 05     4.523    3.744   33.7    8.4   285   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.