(11) Parthenope
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	28 Apr 2026	11.5	2.664 AU	2.115 AU	10h12m	+15°26'	112.2°	20.5°
Opposition	30 Jun 2027	9.2	2.263 AU	1.248 AU	18h37m	-19°20'	176.1°	1.7°

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) : 125.46699
            ω (Argument of perihelion)      : 196.42014
            M (Mean anomaly)                : 173.65693
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 141.83629
            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
2026-04-28 00:00 UT   10 12 53.5   +15 26 52     2.115    2.664  112.2   20.5   113   11.5 
2026-04-28 09:26 UT   10 12 59.5   +15 26 06     2.120    2.664  111.8   20.5   113   11.5 
2026-04-29 00:00 UT   10 13 09.3   +15 24 54     2.127    2.663  111.3   20.6   112   11.5 
2026-04-30 00:00 UT   10 13 26.5   +15 22 48     2.139    2.663  110.4   20.8   112   11.5 
2026-05-01 00:00 UT   10 13 45.0   +15 20 34     2.151    2.662  109.5   20.9   112   11.6 
2026-05-02 00:00 UT   10 14 05.0   +15 18 12     2.163    2.662  108.6   21.0   112   11.6 
2026-05-03 00:00 UT   10 14 26.3   +15 15 42     2.175    2.661  107.8   21.1   112   11.6 
2026-05-04 00:00 UT   10 14 48.9   +15 13 04     2.187    2.661  106.9   21.3   112   11.6 
2026-05-05 00:00 UT   10 15 12.9   +15 10 19     2.199    2.660  106.0   21.4   112   11.6 
2026-05-06 00:00 UT   10 15 38.1   +15 07 26     2.211    2.660  105.2   21.5   112   11.6 
2026-05-07 00:00 UT   10 16 04.6   +15 04 26     2.223    2.659  104.3   21.6   112   11.6 
2026-05-08 00:00 UT   10 16 32.4   +15 01 18     2.235    2.659  103.5   21.7   112   11.7 
2026-05-09 00:00 UT   10 17 01.4   +14 58 03     2.247    2.658  102.7   21.7   112   11.7 
2026-05-10 00:00 UT   10 17 31.7   +14 54 40     2.260    2.657  101.8   21.8   112   11.7 
2026-05-11 00:00 UT   10 18 03.2   +14 51 11     2.272    2.657  101.0   21.9   112   11.7 
2026-05-12 00:00 UT   10 18 35.9   +14 47 34     2.284    2.656  100.2   22.0   112   11.7 
2026-05-13 00:00 UT   10 19 09.7   +14 43 50     2.297    2.656   99.4   22.0   112   11.7 
2026-05-14 00:00 UT   10 19 44.7   +14 39 60     2.309    2.655   98.6   22.1   112   11.7 
2026-05-15 00:00 UT   10 20 20.9   +14 36 02     2.322    2.655   97.8   22.2   112   11.8 
2026-05-16 00:00 UT   10 20 58.2   +14 31 58     2.334    2.654   97.0   22.2   112   11.8 
2026-05-17 00:00 UT   10 21 36.6   +14 27 47     2.347    2.653   96.2   22.3   112   11.8 
2026-05-18 00:00 UT   10 22 16.1   +14 23 30     2.359    2.653   95.4   22.3   112   11.8 
2026-05-19 00:00 UT   10 22 56.7   +14 19 06     2.372    2.652   94.6   22.3   112   11.8 
2026-05-20 00:00 UT   10 23 38.4   +14 14 35     2.384    2.652   93.8   22.4   112   11.8 
2026-05-21 00:00 UT   10 24 21.1   +14 09 59     2.397    2.651   93.1   22.4   112   11.8 
2026-05-22 00:00 UT   10 25 04.8   +14 05 16     2.409    2.650   92.3   22.4   112   11.8 
2026-05-23 00:00 UT   10 25 49.6   +14 00 27     2.422    2.650   91.5   22.5   112   11.9 
2026-05-24 00:00 UT   10 26 35.3   +13 55 32     2.434    2.649   90.8   22.5   112   11.9 
2026-05-25 00:00 UT   10 27 22.0   +13 50 31     2.447    2.648   90.0   22.5   111   11.9 
2026-05-26 00:00 UT   10 28 09.6   +13 45 24     2.459    2.648   89.3   22.5   111   11.9 
2026-05-27 00:00 UT   10 28 58.2   +13 40 11     2.472    2.647   88.5   22.5   111   11.9 
2026-05-28 00:00 UT   10 29 47.7   +13 34 53     2.484    2.647   87.8   22.5   111   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.