(11) Parthenope
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	9 Jul 2026	12.2	2.617 AU	2.974 AU	11h15m	+08°40'	59.9°	19.6°
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) : 125.46946
            ω (Argument of perihelion)      : 196.45557
            M (Mean anomaly)                : 224.94245
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 141.87409
            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
2026-07-09 00:00 UT   11 15 08.9   +08 40 33     2.974    2.617   59.9   19.6   111   12.2 
2026-07-09 16:18 UT   11 16 00.9   +08 34 50     2.981    2.616   59.5   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 
2026-07-14 00:00 UT   11 21 36.2   +07 57 56     3.025    2.613   56.9   19.0   111   12.2 
2026-07-15 00:00 UT   11 22 54.9   +07 49 15     3.035    2.612   56.3   18.9   111   12.2 
2026-07-16 00:00 UT   11 24 14.0   +07 40 32     3.045    2.611   55.7   18.8   111   12.2 
2026-07-17 00:00 UT   11 25 33.5   +07 31 46     3.055    2.610   55.1   18.6   111   12.2 
2026-07-18 00:00 UT   11 26 53.3   +07 22 56     3.065    2.610   54.5   18.5   111   12.2 
2026-07-19 00:00 UT   11 28 13.5   +07 14 04     3.075    2.609   53.9   18.4   111   12.2 
2026-07-20 00:00 UT   11 29 34.1   +07 05 10     3.084    2.608   53.3   18.2   111   12.2 
2026-07-21 00:00 UT   11 30 55.0   +06 56 12     3.094    2.607   52.8   18.1   111   12.2 
2026-07-22 00:00 UT   11 32 16.3   +06 47 13     3.103    2.606   52.2   17.9   111   12.2 
2026-07-23 00:00 UT   11 33 38.0   +06 38 10     3.112    2.606   51.6   17.8   111   12.2 
2026-07-24 00:00 UT   11 34 59.9   +06 29 05     3.121    2.605   51.0   17.6   111   12.2 
2026-07-25 00:00 UT   11 36 22.2   +06 19 58     3.131    2.604   50.4   17.5   110   12.2 
2026-07-26 00:00 UT   11 37 44.9   +06 10 48     3.140    2.603   49.8   17.3   110   12.2 
2026-07-27 00:00 UT   11 39 07.8   +06 01 36     3.149    2.602   49.3   17.2   110   12.2 
2026-07-28 00:00 UT   11 40 31.1   +05 52 22     3.157    2.601   48.7   17.1   110   12.2 
2026-07-29 00:00 UT   11 41 54.7   +05 43 05     3.166    2.601   48.1   16.9   110   12.2 
2026-07-30 00:00 UT   11 43 18.6   +05 33 47     3.175    2.600   47.5   16.7   110   12.2 
2026-07-31 00:00 UT   11 44 42.8   +05 24 26     3.183    2.599   47.0   16.6   110   12.2 
2026-08-01 00:00 UT   11 46 07.3   +05 15 03     3.192    2.598   46.4   16.4   110   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.