(121) Hermione
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	2 Jul 2025	14.0	3.853 AU	3.620 AU	13h05m	-01°07'	95.5°	15.2°
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)                : 0.1248676
            a (Semimajor axis)              : 3.4562492
            i (Inclination)                 : 7.56664
            Ω (Longitude of ascending node) : 72.87341
            ω (Argument of perihelion)      : 297.05553
            M (Mean anomaly)                : 197.26865
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 10.13244
            B (Latitude of perihelion)      : -6.73452
            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. A more printer-friendly version of the same chart can be found below.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-07-02 00:00 UT   13 05 32.3   -01 07 01     3.620    3.853   95.5   15.2   113   14.0 
2025-07-02 05:05 UT   13 05 36.2   -01 07 55     3.623    3.852   95.3   15.2   113   14.0 
2025-07-03 00:00 UT   13 05 51.2   -01 11 14     3.635    3.852   94.6   15.3   113   14.0 
2025-07-04 00:00 UT   13 06 11.0   -01 15 31     3.649    3.852   93.8   15.3   113   14.0 
2025-07-05 00:00 UT   13 06 31.6   -01 19 51     3.663    3.851   92.9   15.3   113   14.0 
2025-07-06 00:00 UT   13 06 53.0   -01 24 16     3.677    3.851   92.1   15.3   113   14.0 
2025-07-07 00:00 UT   13 07 15.1   -01 28 45     3.692    3.850   91.3   15.3   113   14.0 
2025-07-08 00:00 UT   13 07 38.1   -01 33 18     3.706    3.850   90.4   15.3   112   14.0 
2025-07-09 00:00 UT   13 08 01.9   -01 37 54     3.720    3.850   89.6   15.3   112   14.0 
2025-07-10 00:00 UT   13 08 26.4   -01 42 34     3.734    3.849   88.8   15.3   112   14.0 
2025-07-11 00:00 UT   13 08 51.7   -01 47 18     3.749    3.849   87.9   15.3   112   14.0 
2025-07-12 00:00 UT   13 09 17.8   -01 52 06     3.763    3.848   87.1   15.3   112   14.0 
2025-07-13 00:00 UT   13 09 44.6   -01 56 57     3.777    3.848   86.3   15.3   112   14.1 
2025-07-14 00:00 UT   13 10 12.2   -02 01 51     3.791    3.847   85.5   15.3   112   14.1 
2025-07-15 00:00 UT   13 10 40.4   -02 06 49     3.806    3.847   84.7   15.3   112   14.1 
2025-07-16 00:00 UT   13 11 09.4   -02 11 51     3.820    3.847   83.9   15.2   112   14.1 
2025-07-17 00:00 UT   13 11 39.2   -02 16 55     3.834    3.846   83.1   15.2   112   14.1 
2025-07-18 00:00 UT   13 12 09.6   -02 22 03     3.848    3.846   82.3   15.2   112   14.1 
2025-07-19 00:00 UT   13 12 40.7   -02 27 15     3.862    3.845   81.5   15.2   112   14.1 
2025-07-20 00:00 UT   13 13 12.6   -02 32 29     3.876    3.845   80.7   15.1   111   14.1 
2025-07-21 00:00 UT   13 13 45.1   -02 37 46     3.890    3.844   79.9   15.1   111   14.1 
2025-07-22 00:00 UT   13 14 18.3   -02 43 07     3.904    3.844   79.1   15.0   111   14.1 
2025-07-23 00:00 UT   13 14 52.2   -02 48 30     3.918    3.843   78.3   15.0   111   14.1 
2025-07-24 00:00 UT   13 15 26.8   -02 53 57     3.932    3.843   77.5   15.0   111   14.1 
2025-07-25 00:00 UT   13 16 02.0   -02 59 26     3.946    3.842   76.7   14.9   111   14.1 
2025-07-26 00:00 UT   13 16 37.9   -03 04 58     3.960    3.842   76.0   14.9   111   14.1 
2025-07-27 00:00 UT   13 17 14.4   -03 10 33     3.974    3.842   75.2   14.8   111   14.1 
2025-07-28 00:00 UT   13 17 51.6   -03 16 10     3.987    3.841   74.4   14.8   111   14.2 
2025-07-29 00:00 UT   13 18 29.4   -03 21 50     4.001    3.841   73.6   14.7   111   14.2 
2025-07-30 00:00 UT   13 19 07.8   -03 27 33     4.015    3.840   72.9   14.6   111   14.2 
2025-07-31 00:00 UT   13 19 46.8   -03 33 18     4.028    3.840   72.1   14.6   111   14.2 
2025-08-01 00:00 UT   13 20 26.4   -03 39 05     4.042    3.839   71.3   14.5   110   14.2 

    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.