(121) Hermione
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	5 Jun 2026	12.3	3.595 AU	2.580 AU	16h52m	-22°51'	179.7°	0.1°
Today	15 Jul 2026	13.0	3.553 AU	2.745 AU	16h27m	-23°00'	136.6°	11.3°

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 Hermione are:

            e (Eccentricity)                : 0.1244488
            a (Semimajor axis)              : 3.4577722
            i (Inclination)                 : 7.56551
            Ω (Longitude of ascending node) : 72.87631
            ω (Argument of perihelion)      : 296.93689
            M (Mean anomaly)                : 258.70793
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 10.01603
            B (Latitude of perihelion)      : -6.74065
            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
2026-07-15 00:00 UT   16 27 30.9   -23 00 01     2.745    3.553  136.6   11.3    98   13.0 
2026-07-15 16:57 UT   16 27 16.1   -23 00 20     2.751    3.552  135.9   11.5    98   13.0 
2026-07-16 00:00 UT   16 27 10.2   -23 00 28     2.754    3.551  135.6   11.6    98   13.0 
2026-07-17 00:00 UT   16 26 50.7   -23 00 57     2.763    3.550  134.5   11.8    98   13.1 
2026-07-18 00:00 UT   16 26 32.4   -23 01 28     2.772    3.549  133.5   12.0    98   13.1 
2026-07-19 00:00 UT   16 26 15.3   -23 01 60     2.782    3.548  132.5   12.2    98   13.1 
2026-07-20 00:00 UT   16 25 59.5   -23 02 34     2.791    3.547  131.5   12.4    98   13.1 
2026-07-21 00:00 UT   16 25 44.8   -23 03 10     2.801    3.546  130.5   12.6    98   13.1 
2026-07-22 00:00 UT   16 25 31.4   -23 03 47     2.811    3.545  129.5   12.8    98   13.1 
2026-07-23 00:00 UT   16 25 19.2   -23 04 27     2.821    3.544  128.5   13.0    98   13.2 
2026-07-24 00:00 UT   16 25 08.3   -23 05 08     2.832    3.543  127.5   13.2    98   13.2 
2026-07-25 00:00 UT   16 24 58.5   -23 05 51     2.842    3.542  126.5   13.3    98   13.2 
2026-07-26 00:00 UT   16 24 50.1   -23 06 37     2.853    3.541  125.5   13.5    98   13.2 
2026-07-27 00:00 UT   16 24 42.8   -23 07 24     2.863    3.539  124.5   13.7    98   13.2 
2026-07-28 00:00 UT   16 24 36.8   -23 08 13     2.874    3.538  123.6   13.8    98   13.2 
2026-07-29 00:00 UT   16 24 32.1   -23 09 04     2.885    3.537  122.6   14.0    98   13.2 
2026-07-30 00:00 UT   16 24 28.5   -23 09 57     2.897    3.536  121.6   14.2    98   13.2 
2026-07-31 00:00 UT   16 24 26.3   -23 10 53     2.908    3.535  120.7   14.3    98   13.3 
2026-08-01 00:00 UT   16 24 25.2   -23 11 50     2.919    3.534  119.7   14.4    98   13.3 
2026-08-02 00:00 UT   16 24 25.4   -23 12 49     2.931    3.533  118.7   14.6    98   13.3 
2026-08-03 00:00 UT   16 24 26.8   -23 13 51     2.942    3.532  117.8   14.7    98   13.3 
2026-08-04 00:00 UT   16 24 29.4   -23 14 54     2.954    3.531  116.9   14.9    98   13.3 
2026-08-05 00:00 UT   16 24 33.2   -23 15 59     2.966    3.529  115.9   15.0    98   13.3 
2026-08-06 00:00 UT   16 24 38.3   -23 17 07     2.978    3.528  115.0   15.1    98   13.3 
2026-08-07 00:00 UT   16 24 44.6   -23 18 16     2.990    3.527  114.1   15.2    99   13.3 
2026-08-08 00:00 UT   16 24 52.1   -23 19 28     3.002    3.526  113.1   15.3    99   13.4 
2026-08-09 00:00 UT   16 25 00.8   -23 20 41     3.015    3.525  112.2   15.4    99   13.4 
2026-08-10 00:00 UT   16 25 10.7   -23 21 57     3.027    3.524  111.3   15.5    99   13.4 
2026-08-11 00:00 UT   16 25 21.8   -23 23 15     3.039    3.523  110.4   15.6    99   13.4 
2026-08-12 00:00 UT   16 25 34.2   -23 24 34     3.052    3.522  109.5   15.7    99   13.4 
2026-08-13 00:00 UT   16 25 47.7   -23 25 56     3.065    3.521  108.6   15.8    99   13.4 
2026-08-14 00:00 UT   16 26 02.4   -23 27 19     3.077    3.519  107.7   15.9    99   13.4 

    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.