(11) Parthenope
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	29 Jun 2025	11.9	2.643 AU	3.651 AU	06h57m	+21°38'	6.2°	2.4°
Opposition	25 Feb 2026	10.2	2.689 AU	1.700 AU	10h41m	+12°24'	176.1°	1.4°

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 Parthenope are:

            e (Eccentricity)                : 0.0997989
            a (Semimajor axis)              : 2.4543177
            i (Inclination)                 : 4.63342
            Ω (Longitude of ascending node) : 125.47456
            ω (Argument of perihelion)      : 196.37206
            M (Mean anomaly)                : 122.46023
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 141.79597
            B (Latitude of perihelion)      : -1.30473
            P (Orbital period in years)     : 3.84            
        

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
2025-06-29 00:00 UT   06 57 17.8   +21 38 24     3.651    2.643    6.2    2.4   106   11.9 
2025-06-29 05:14 UT   06 57 41.6   +21 38 01     3.651    2.643    6.1    2.3   106   11.9 
2025-06-30 00:00 UT   06 59 06.8   +21 36 37     3.653    2.643    5.7    2.2   107   11.9 
2025-07-01 00:00 UT   07 00 55.8   +21 34 44     3.655    2.644    5.2    2.0   108   11.9 
2025-07-02 00:00 UT   07 02 44.6   +21 32 47     3.656    2.644    4.7    1.8   110   11.9 
2025-07-03 00:00 UT   07 04 33.4   +21 30 45     3.658    2.645    4.1    1.6   111   11.9 
2025-07-04 00:00 UT   07 06 22.2   +21 28 38     3.660    2.646    3.6    1.4   114   11.8 
2025-07-05 00:00 UT   07 08 10.8   +21 26 27     3.661    2.646    3.1    1.2   117   11.8 
2025-07-06 00:00 UT   07 09 59.4   +21 24 11     3.662    2.647    2.6    1.0   120   11.8 
2025-07-07 00:00 UT   07 11 47.9   +21 21 51     3.663    2.648    2.1    0.8   126   11.8 
2025-07-08 00:00 UT   07 13 36.3   +21 19 26     3.664    2.648    1.7    0.7   134   11.8 
2025-07-09 00:00 UT   07 15 24.6   +21 16 56     3.665    2.649    1.3    0.5   148   11.8 
2025-07-10 00:00 UT   07 17 12.7   +21 14 22     3.666    2.650    1.0    0.4   172   11.8 
2025-07-11 00:00 UT   07 19 00.8   +21 11 43     3.666    2.650    1.0    0.4   202   11.8 
2025-07-12 00:00 UT   07 20 48.8   +21 08 60     3.667    2.651    1.2    0.5   226   11.8 
2025-07-13 00:00 UT   07 22 36.7   +21 06 12     3.667    2.651    1.6    0.6   242   11.8 
2025-07-14 00:00 UT   07 24 24.5   +21 03 20     3.667    2.652    2.1    0.8   251   11.8 
2025-07-15 00:00 UT   07 26 12.2   +21 00 23     3.668    2.653    2.6    1.0   257   11.8 
2025-07-16 00:00 UT   07 27 59.7   +20 57 23     3.667    2.653    3.0    1.2   261   11.8 
2025-07-17 00:00 UT   07 29 47.1   +20 54 17     3.667    2.654    3.6    1.4   264   11.9 
2025-07-18 00:00 UT   07 31 34.4   +20 51 08     3.667    2.654    4.1    1.6   266   11.9 
2025-07-19 00:00 UT   07 33 21.6   +20 47 54     3.667    2.655    4.6    1.8   268   11.9 

    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.