(11) Parthenope
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	17 Jun 2026	12.1	2.633 AU	2.729 AU	10h49m	+11°30'	73.8°	21.7°
Opposition	30 Jun 2027	9.2	2.261 AU	1.246 AU	18h38m	-19°20'	176.1°	1.8°

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)                : 0.1008882
            a (Semimajor axis)              : 2.4522592
            i (Inclination)                 : 4.63618
            Ω (Longitude of ascending node) : 125.46944
            ω (Argument of perihelion)      : 196.45558
            M (Mean anomaly)                : 224.94246
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 141.87408
            B (Latitude of perihelion)      : -1.31198
            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.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-06-17 00:00 UT   10 49 04.7   +11 30 44     2.729    2.633   73.8   21.7   111   12.1 
2026-06-17 08:13 UT   10 49 27.0   +11 28 19     2.733    2.633   73.6   21.7   111   12.1 
2026-06-18 00:00 UT   10 50 10.1   +11 23 41     2.740    2.632   73.2   21.7   111   12.1 
2026-06-19 00:00 UT   10 51 16.0   +11 16 33     2.752    2.632   72.5   21.6   111   12.1 
2026-06-20 00:00 UT   10 52 22.6   +11 09 22     2.764    2.631   71.9   21.5   111   12.1 
2026-06-21 00:00 UT   10 53 29.8   +11 02 06     2.775    2.630   71.2   21.5   111   12.1 
2026-06-22 00:00 UT   10 54 37.6   +10 54 46     2.787    2.629   70.6   21.4   111   12.1 
2026-06-23 00:00 UT   10 55 45.9   +10 47 22     2.799    2.629   69.9   21.3   111   12.1 
2026-06-24 00:00 UT   10 56 54.8   +10 39 55     2.810    2.628   69.3   21.2   111   12.1 
2026-06-25 00:00 UT   10 58 04.3   +10 32 23     2.821    2.627   68.6   21.1   111   12.1 
2026-06-26 00:00 UT   10 59 14.3   +10 24 47     2.833    2.627   68.0   21.0   111   12.1 
2026-06-27 00:00 UT   11 00 24.8   +10 17 07     2.844    2.626   67.3   20.9   111   12.1 
2026-06-28 00:00 UT   11 01 35.8   +10 09 24     2.855    2.625   66.7   20.8   111   12.1 
2026-06-29 00:00 UT   11 02 47.3   +10 01 37     2.866    2.624   66.1   20.7   111   12.1 
2026-06-30 00:00 UT   11 03 59.4   +09 53 46     2.878    2.624   65.5   20.6   111   12.1 
2026-07-01 00:00 UT   11 05 11.9   +09 45 52     2.889    2.623   64.8   20.5   111   12.1 
2026-07-02 00:00 UT   11 06 24.9   +09 37 54     2.900    2.622   64.2   20.4   111   12.1 
2026-07-03 00:00 UT   11 07 38.4   +09 29 53     2.910    2.621   63.6   20.3   111   12.2 
2026-07-04 00:00 UT   11 08 52.3   +09 21 48     2.921    2.621   63.0   20.2   111   12.2 
2026-07-05 00:00 UT   11 10 06.8   +09 13 40     2.932    2.620   62.3   20.1   111   12.2 
2026-07-06 00:00 UT   11 11 21.6   +09 05 28     2.943    2.619   61.7   20.0   111   12.2 
2026-07-07 00:00 UT   11 12 36.9   +08 57 13     2.953    2.618   61.1   19.9   111   12.2 
2026-07-08 00:00 UT   11 13 52.7   +08 48 54     2.964    2.618   60.5   19.8   111   12.2 
2026-07-09 00:00 UT   11 15 08.9   +08 40 33     2.974    2.617   59.9   19.6   111   12.2 
2026-07-10 00:00 UT   11 16 25.5   +08 32 08     2.985    2.616   59.3   19.5   111   12.2 
2026-07-11 00:00 UT   11 17 42.6   +08 23 39     2.995    2.615   58.7   19.4   111   12.2 
2026-07-12 00:00 UT   11 19 00.0   +08 15 08     3.005    2.614   58.1   19.3   111   12.2 
2026-07-13 00:00 UT   11 20 17.9   +08 06 33     3.015    2.614   57.5   19.1   111   12.2 

    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.