(121) Hermione
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	30 Dec 2025	14.1	3.742 AU	4.494 AU	16h02m	-18°34'	35.9°	8.9°
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)              : 3.4569988
            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
2025-12-30 00:00 UT   16 02 48.3   -18 34 01     4.494    3.742   35.9    8.9   284   14.1 
2025-12-30 12:06 UT   16 03 24.1   -18 35 59     4.489    3.742   36.3    8.9   284   14.1 
2025-12-31 00:00 UT   16 03 59.3   -18 37 55     4.484    3.741   36.6    9.0   284   14.1 
2026-01-01 00:00 UT   16 05 10.1   -18 41 46     4.474    3.740   37.3    9.2   284   14.1 
2026-01-02 00:00 UT   16 06 20.6   -18 45 34     4.464    3.740   38.1    9.3   284   14.1 
2026-01-03 00:00 UT   16 07 31.0   -18 49 20     4.454    3.739   38.8    9.5   283   14.1 
2026-01-04 00:00 UT   16 08 41.1   -18 53 03     4.443    3.738   39.5    9.6   283   14.1 
2026-01-05 00:00 UT   16 09 51.0   -18 56 43     4.433    3.737   40.3    9.8   283   14.1 
2026-01-06 00:00 UT   16 11 00.7   -19 00 21     4.422    3.736   41.0    9.9   283   14.1 
2026-01-07 00:00 UT   16 12 10.2   -19 03 57     4.411    3.735   41.7   10.1   283   14.1 
2026-01-08 00:00 UT   16 13 19.4   -19 07 29     4.400    3.735   42.5   10.2   282   14.1 
2026-01-09 00:00 UT   16 14 28.3   -19 10 59     4.389    3.734   43.2   10.4   282   14.1 
2026-01-10 00:00 UT   16 15 37.0   -19 14 27     4.378    3.733   44.0   10.5   282   14.1 
2026-01-11 00:00 UT   16 16 45.4   -19 17 52     4.366    3.732   44.7   10.7   282   14.1 
2026-01-12 00:00 UT   16 17 53.6   -19 21 14     4.355    3.731   45.5   10.8   282   14.1 
2026-01-13 00:00 UT   16 19 01.4   -19 24 34     4.343    3.731   46.2   11.0   282   14.1 
2026-01-14 00:00 UT   16 20 09.0   -19 27 51     4.331    3.730   46.9   11.1   281   14.1 
2026-01-15 00:00 UT   16 21 16.2   -19 31 06     4.319    3.729   47.7   11.3   281   14.1 
2026-01-16 00:00 UT   16 22 23.1   -19 34 18     4.307    3.728   48.4   11.4   281   14.1 
2026-01-17 00:00 UT   16 23 29.7   -19 37 28     4.295    3.727   49.2   11.5   281   14.1 
2026-01-18 00:00 UT   16 24 36.0   -19 40 35     4.283    3.726   49.9   11.7   281   14.1 
2026-01-19 00:00 UT   16 25 41.9   -19 43 39     4.270    3.726   50.7   11.8   281   14.1 
2026-01-20 00:00 UT   16 26 47.5   -19 46 41     4.258    3.725   51.5   11.9   281   14.1 
2026-01-21 00:00 UT   16 27 52.7   -19 49 40     4.245    3.724   52.2   12.1   280   14.1 
2026-01-22 00:00 UT   16 28 57.5   -19 52 37     4.232    3.723   53.0   12.2   280   14.1 
2026-01-23 00:00 UT   16 30 01.9   -19 55 32     4.219    3.722   53.7   12.3   280   14.1 
2026-01-24 00:00 UT   16 31 06.0   -19 58 24     4.206    3.721   54.5   12.4   280   14.1 
2026-01-25 00:00 UT   16 32 09.6   -20 01 13     4.193    3.721   55.3   12.6   280   14.1 
2026-01-26 00:00 UT   16 33 12.9   -20 04 00     4.179    3.720   56.0   12.7   280   14.1 
2026-01-27 00:00 UT   16 34 15.7   -20 06 45     4.166    3.719   56.8   12.8   280   14.1 
2026-01-28 00:00 UT   16 35 18.0   -20 09 27     4.152    3.718   57.6   12.9   279   14.1 
2026-01-29 00:00 UT   16 36 20.0   -20 12 07     4.139    3.717   58.3   13.0   279   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.