(11) Parthenope
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	21 Jan 2026	11.1	2.697 AU	1.896 AU	11h05m	+08°46'	136.5°	14.5°
Opposition	25 Feb 2026	10.2	2.689 AU	1.701 AU	10h41m	+12°25'	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)                : 0.1004774
            a (Semimajor axis)              : 2.4531673
            i (Inclination)                 : 4.63575
            Ω (Longitude of ascending node) : 125.46698
            ω (Argument of perihelion)      : 196.42014
            M (Mean anomaly)                : 173.65693
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 141.83628
            B (Latitude of perihelion)      : -1.30911
            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
2026-01-21 00:00 UT   11 05 12.5   +08 46 35     1.896    2.697  136.5   14.5   290   11.1 
2026-01-21 04:56 UT   11 05 09.0   +08 47 26     1.894    2.697  136.7   14.5   290   11.1 
2026-01-22 00:00 UT   11 04 54.7   +08 50 45     1.887    2.697  137.6   14.2   290   11.1 
2026-01-23 00:00 UT   11 04 35.4   +08 55 05     1.877    2.697  138.7   13.9   290   11.0 
2026-01-24 00:00 UT   11 04 14.6   +08 59 35     1.868    2.697  139.9   13.6   289   11.0 
2026-01-25 00:00 UT   11 03 52.2   +09 04 14     1.859    2.696  141.0   13.3   289   11.0 
2026-01-26 00:00 UT   11 03 28.3   +09 09 02     1.850    2.696  142.1   13.0   289   11.0 
2026-01-27 00:00 UT   11 03 02.9   +09 13 60     1.842    2.696  143.3   12.6   289   11.0 
2026-01-28 00:00 UT   11 02 36.0   +09 19 06     1.833    2.696  144.4   12.3   289   10.9 
2026-01-29 00:00 UT   11 02 07.7   +09 24 21     1.825    2.696  145.6   11.9   288   10.9 
2026-01-30 00:00 UT   11 01 37.9   +09 29 44     1.817    2.695  146.7   11.6   288   10.9 
2026-01-31 00:00 UT   11 01 06.7   +09 35 15     1.810    2.695  147.9   11.2   288   10.9 
2026-02-01 00:00 UT   11 00 34.0   +09 40 54     1.802    2.695  149.0   10.8   287   10.8 
2026-02-02 00:00 UT   11 00 00.0   +09 46 41     1.795    2.695  150.2   10.5   287   10.8 
2026-02-03 00:00 UT   10 59 24.6   +09 52 36     1.788    2.695  151.4   10.1   287   10.8 
2026-02-04 00:00 UT   10 58 47.9   +09 58 37     1.781    2.695  152.6    9.7   286   10.8 
2026-02-05 00:00 UT   10 58 09.9   +10 04 46     1.775    2.694  153.7    9.3   286   10.7 
2026-02-06 00:00 UT   10 57 30.6   +10 11 01     1.768    2.694  154.9    8.9   286   10.7 
2026-02-07 00:00 UT   10 56 50.1   +10 17 22     1.762    2.694  156.1    8.5   285   10.7 
2026-02-08 00:00 UT   10 56 08.4   +10 23 49     1.757    2.694  157.3    8.1   285   10.7 
2026-02-09 00:00 UT   10 55 25.5   +10 30 21     1.751    2.693  158.5    7.7   284   10.6 
2026-02-10 00:00 UT   10 54 41.4   +10 36 59     1.746    2.693  159.7    7.3   283   10.6 
2026-02-11 00:00 UT   10 53 56.3   +10 43 41     1.741    2.693  160.9    6.9   282   10.6 
2026-02-12 00:00 UT   10 53 10.2   +10 50 28     1.736    2.693  162.1    6.5   282   10.6 
2026-02-13 00:00 UT   10 52 23.0   +10 57 19     1.732    2.693  163.3    6.0   281   10.5 
2026-02-14 00:00 UT   10 51 34.9   +11 04 13     1.728    2.692  164.5    5.6   280   10.5 
2026-02-15 00:00 UT   10 50 46.0   +11 11 10     1.724    2.692  165.7    5.2   278   10.5 
2026-02-16 00:00 UT   10 49 56.2   +11 18 09     1.720    2.692  166.9    4.8   277   10.5 
2026-02-17 00:00 UT   10 49 05.6   +11 25 11     1.717    2.692  168.1    4.3   275   10.4 
2026-02-18 00:00 UT   10 48 14.3   +11 32 14     1.714    2.691  169.3    3.9   273   10.4 
2026-02-19 00:00 UT   10 47 22.3   +11 39 19     1.711    2.691  170.4    3.5   270   10.4 
2026-02-20 00:00 UT   10 46 29.8   +11 46 24     1.709    2.691  171.6    3.1   266   10.4 

    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.