(121) Hermione
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	31 Mar 2026	13.6	3.662 AU	3.204 AU	17h18m	-21°58'	109.6°	14.9°
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)              : 3.4569989
            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
2026-03-31 00:00 UT   17 18 22.1   -21 58 09     3.204    3.662  109.6   14.9   274   13.6 
2026-03-31 11:26 UT   17 18 28.5   -21 58 42     3.197    3.661  110.0   14.9   274   13.6 
2026-04-01 00:00 UT   17 18 35.3   -21 59 18     3.189    3.661  110.5   14.8   274   13.6 
2026-04-02 00:00 UT   17 18 47.4   -22 00 26     3.174    3.660  111.4   14.7   274   13.5 
2026-04-03 00:00 UT   17 18 58.3   -22 01 34     3.160    3.659  112.4   14.6   274   13.5 
2026-04-04 00:00 UT   17 19 08.1   -22 02 41     3.145    3.658  113.3   14.5   274   13.5 
2026-04-05 00:00 UT   17 19 16.7   -22 03 47     3.130    3.657  114.3   14.4   274   13.5 
2026-04-06 00:00 UT   17 19 24.2   -22 04 53     3.116    3.656  115.2   14.3   274   13.5 
2026-04-07 00:00 UT   17 19 30.5   -22 05 59     3.101    3.655  116.2   14.2   274   13.5 
2026-04-08 00:00 UT   17 19 35.6   -22 07 04     3.087    3.654  117.2   14.1   273   13.5 
2026-04-09 00:00 UT   17 19 39.5   -22 08 09     3.073    3.653  118.1   14.0   273   13.4 
2026-04-10 00:00 UT   17 19 42.2   -22 09 13     3.059    3.652  119.1   13.9   273   13.4 
2026-04-11 00:00 UT   17 19 43.7   -22 10 17     3.045    3.651  120.1   13.7   273   13.4 
2026-04-12 00:00 UT   17 19 43.9   -22 11 20     3.031    3.650  121.0   13.6   273   13.4 
2026-04-13 00:00 UT   17 19 43.0   -22 12 23     3.017    3.649  122.0   13.5   273   13.4 
2026-04-14 00:00 UT   17 19 40.9   -22 13 26     3.004    3.648  123.0   13.3   273   13.4 
2026-04-15 00:00 UT   17 19 37.5   -22 14 28     2.990    3.647  124.0   13.2   273   13.3 
2026-04-16 00:00 UT   17 19 32.9   -22 15 29     2.977    3.646  125.0   13.0   273   13.3 
2026-04-17 00:00 UT   17 19 27.0   -22 16 31     2.964    3.645  126.0   12.9   273   13.3 
2026-04-18 00:00 UT   17 19 19.9   -22 17 31     2.951    3.644  127.0   12.7   273   13.3 
2026-04-19 00:00 UT   17 19 11.6   -22 18 32     2.938    3.643  128.0   12.5   273   13.3 
2026-04-20 00:00 UT   17 19 02.1   -22 19 31     2.925    3.642  129.0   12.4   273   13.3 
2026-04-21 00:00 UT   17 18 51.4   -22 20 31     2.913    3.641  130.0   12.2   273   13.2 
2026-04-22 00:00 UT   17 18 39.4   -22 21 30     2.900    3.640  131.1   12.0   273   13.2 
2026-04-23 00:00 UT   17 18 26.2   -22 22 28     2.888    3.639  132.1   11.8   273   13.2 
2026-04-24 00:00 UT   17 18 11.8   -22 23 26     2.876    3.638  133.1   11.6   273   13.2 
2026-04-25 00:00 UT   17 17 56.2   -22 24 23     2.864    3.637  134.2   11.4   274   13.2 
2026-04-26 00:00 UT   17 17 39.4   -22 25 20     2.853    3.636  135.2   11.2   274   13.2 
2026-04-27 00:00 UT   17 17 21.4   -22 26 17     2.841    3.635  136.2   11.0   274   13.1 
2026-04-28 00:00 UT   17 17 02.3   -22 27 12     2.830    3.634  137.3   10.8   274   13.1 
2026-04-29 00:00 UT   17 16 42.0   -22 28 08     2.819    3.633  138.3   10.6   274   13.1 
2026-04-30 00:00 UT   17 16 20.5   -22 29 02     2.808    3.632  139.4   10.4   274   13.1 

    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.