(121) Hermione
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	13 Sep 2026	13.7	3.485 AU	3.473 AU	16h41m	-24°20'	82.4°	16.6°
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
2026-09-13 00:00 UT   16 41 48.5   -24 20 48     3.473    3.485   82.4   16.6    98   13.7 
2026-09-13 20:10 UT   16 42 27.8   -24 22 31     3.484    3.485   81.7   16.6    98   13.7 
2026-09-14 00:00 UT   16 42 35.3   -24 22 50     3.486    3.484   81.6   16.6    98   13.7 
2026-09-15 00:00 UT   16 43 23.0   -24 24 54     3.500    3.483   80.8   16.6    98   13.7 
2026-09-16 00:00 UT   16 44 11.6   -24 26 57     3.513    3.482   80.0   16.5    98   13.7 
2026-09-17 00:00 UT   16 45 01.0   -24 29 01     3.526    3.481   79.2   16.5    98   13.7 
2026-09-18 00:00 UT   16 45 51.3   -24 31 06     3.539    3.480   78.4   16.4    98   13.7 
2026-09-19 00:00 UT   16 46 42.4   -24 33 10     3.552    3.479   77.7   16.4    98   13.7 
2026-09-20 00:00 UT   16 47 34.3   -24 35 15     3.565    3.477   76.9   16.3    98   13.7 
2026-09-21 00:00 UT   16 48 27.1   -24 37 19     3.578    3.476   76.1   16.3    98   13.7 
2026-09-22 00:00 UT   16 49 20.7   -24 39 24     3.591    3.475   75.3   16.2    98   13.7 
2026-09-23 00:00 UT   16 50 15.0   -24 41 29     3.604    3.474   74.6   16.2    97   13.8 
2026-09-24 00:00 UT   16 51 10.2   -24 43 33     3.616    3.473   73.8   16.1    97   13.8 
2026-09-25 00:00 UT   16 52 06.1   -24 45 38     3.629    3.472   73.0   16.0    97   13.8 
2026-09-26 00:00 UT   16 53 02.8   -24 47 42     3.642    3.471   72.3   16.0    97   13.8 
2026-09-27 00:00 UT   16 54 00.3   -24 49 46     3.654    3.469   71.5   15.9    97   13.8 
2026-09-28 00:00 UT   16 54 58.5   -24 51 50     3.667    3.468   70.8   15.8    97   13.8 
2026-09-29 00:00 UT   16 55 57.4   -24 53 53     3.679    3.467   70.0   15.8    97   13.8 
2026-09-30 00:00 UT   16 56 57.1   -24 55 56     3.692    3.466   69.3   15.7    97   13.8 
2026-10-01 00:00 UT   16 57 57.5   -24 57 58     3.704    3.465   68.5   15.6    97   13.8 
2026-10-02 00:00 UT   16 58 58.6   -25 00 00     3.716    3.464   67.8   15.5    97   13.8 
2026-10-03 00:00 UT   17 00 00.4   -25 02 02     3.729    3.463   67.0   15.4    97   13.8 
2026-10-04 00:00 UT   17 01 03.0   -25 04 02     3.741    3.461   66.3   15.3    97   13.8 
2026-10-05 00:00 UT   17 02 06.2   -25 06 02     3.753    3.460   65.5   15.3    97   13.8 
2026-10-06 00:00 UT   17 03 10.1   -25 08 02     3.765    3.459   64.8   15.2    97   13.8 
2026-10-07 00:00 UT   17 04 14.7   -25 09 60     3.777    3.458   64.0   15.1    97   13.8 
2026-10-08 00:00 UT   17 05 20.0   -25 11 58     3.788    3.457   63.3   15.0    97   13.8 
2026-10-09 00:00 UT   17 06 25.9   -25 13 54     3.800    3.456   62.6   14.9    97   13.8 
2026-10-10 00:00 UT   17 07 32.5   -25 15 50     3.812    3.455   61.8   14.8    96   13.8 
2026-10-11 00:00 UT   17 08 39.7   -25 17 45     3.823    3.453   61.1   14.7    96   13.8 
2026-10-12 00:00 UT   17 09 47.6   -25 19 38     3.835    3.452   60.4   14.6    96   13.8 
2026-10-13 00:00 UT   17 10 56.1   -25 21 31     3.846    3.451   59.6   14.4    96   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.