(121) Hermione
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	13 Oct 2026	13.8	3.451 AU	3.846 AU	17h10m	-25°21'	59.6°	14.4°
Opposition	19 Aug 2027	11.8	3.123 AU	2.123 AU	22h09m	-22°48'	169.3°	3.5°

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
2026-10-13 00:00 UT   17 10 56.1   -25 21 31     3.846    3.451   59.6   14.4    96   13.8 
2026-10-13 20:43 UT   17 11 55.7   -25 23 07     3.856    3.450   59.0   14.4    96   13.8 
2026-10-14 00:00 UT   17 12 05.2   -25 23 22     3.857    3.450   58.9   14.3    96   13.8 
2026-10-15 00:00 UT   17 13 14.9   -25 25 12     3.869    3.449   58.2   14.2    96   13.8 
2026-10-16 00:00 UT   17 14 25.2   -25 27 00     3.880    3.448   57.5   14.1    96   13.8 
2026-10-17 00:00 UT   17 15 36.1   -25 28 48     3.891    3.446   56.7   14.0    96   13.8 
2026-10-18 00:00 UT   17 16 47.6   -25 30 34     3.902    3.445   56.0   13.9    96   13.8 
2026-10-19 00:00 UT   17 17 59.7   -25 32 18     3.912    3.444   55.3   13.8    96   13.8 
2026-10-20 00:00 UT   17 19 12.3   -25 34 01     3.923    3.443   54.6   13.6    96   13.8 
2026-10-21 00:00 UT   17 20 25.5   -25 35 42     3.934    3.442   53.9   13.5    96   13.8 
2026-10-22 00:00 UT   17 21 39.2   -25 37 22     3.944    3.441   53.2   13.4    96   13.8 
2026-10-23 00:00 UT   17 22 53.4   -25 39 00     3.954    3.440   52.4   13.3    96   13.8 
2026-10-24 00:00 UT   17 24 08.2   -25 40 37     3.965    3.438   51.7   13.1    96   13.8 
2026-10-25 00:00 UT   17 25 23.5   -25 42 12     3.975    3.437   51.0   13.0    95   13.8 
2026-10-26 00:00 UT   17 26 39.3   -25 43 45     3.985    3.436   50.3   12.9    95   13.8 
2026-10-27 00:00 UT   17 27 55.7   -25 45 16     3.995    3.435   49.6   12.7    95   13.8 
2026-10-28 00:00 UT   17 29 12.5   -25 46 45     4.004    3.434   48.9   12.6    95   13.8 
2026-10-29 00:00 UT   17 30 29.8   -25 48 12     4.014    3.433   48.2   12.5    95   13.8 
2026-10-30 00:00 UT   17 31 47.6   -25 49 37     4.023    3.431   47.5   12.3    95   13.8 
2026-10-31 00:00 UT   17 33 05.9   -25 51 01     4.033    3.430   46.8   12.2    95   13.8 
2026-11-01 00:00 UT   17 34 24.6   -25 52 22     4.042    3.429   46.1   12.0    95   13.8 
2026-11-02 00:00 UT   17 35 43.8   -25 53 41     4.051    3.428   45.4   11.9    95   13.8 
2026-11-03 00:00 UT   17 37 03.5   -25 54 58     4.060    3.427   44.7   11.7    95   13.8 
2026-11-04 00:00 UT   17 38 23.7   -25 56 13     4.069    3.426   44.0   11.6    95   13.8 
2026-11-05 00:00 UT   17 39 44.2   -25 57 26     4.078    3.424   43.3   11.5    95   13.8 
2026-11-06 00:00 UT   17 41 05.3   -25 58 36     4.087    3.423   42.6   11.3    95   13.8 
2026-11-07 00:00 UT   17 42 26.7   -25 59 44     4.095    3.422   41.9   11.2    95   13.8 
2026-11-08 00:00 UT   17 43 48.6   -26 00 50     4.104    3.421   41.2   11.0    95   13.8 
2026-11-09 00:00 UT   17 45 10.9   -26 01 53     4.112    3.420   40.5   10.8    95   13.8 
2026-11-10 00:00 UT   17 46 33.6   -26 02 54     4.120    3.419   39.8   10.7    95   13.8 
2026-11-11 00:00 UT   17 47 56.7   -26 03 53     4.128    3.418   39.1   10.5    94   13.8 

    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.