(20) Massalia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	18 Oct 2025	11.2	2.093 AU	2.565 AU	10h19m	+09°50'	51.4°	21.8°
Opposition	21 Mar 2026	9.0	2.287 AU	1.291 AU	12h01m	-00°46'	179.4°	0.2°

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 Massalia are:

            e (Eccentricity)                : 0.1437636
            a (Semimajor axis)              : 2.4084078
            i (Inclination)                 : 0.70925
            Ω (Longitude of ascending node) : 205.95442
            ω (Argument of perihelion)      : 257.23343
            M (Mean anomaly)                : 29.99984
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 283.18690
            B (Latitude of perihelion)      : -0.69172
            P (Orbital period in years)     : 3.74            
        

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
2025-10-18 00:00 UT   10 19 27.3   +09 50 14     2.565    2.093   51.4   21.8   291   11.2 
2025-10-18 21:18 UT   10 21 06.1   +09 40 45     2.558    2.094   51.8   22.0   291   11.2 
2025-10-19 00:00 UT   10 21 18.6   +09 39 33     2.557    2.094   51.9   22.0   291   11.2 
2025-10-20 00:00 UT   10 23 09.5   +09 28 52     2.548    2.095   52.4   22.1   291   11.2 
2025-10-21 00:00 UT   10 24 59.9   +09 18 10     2.540    2.096   52.9   22.3   291   11.2 
2025-10-22 00:00 UT   10 26 49.8   +09 07 28     2.531    2.096   53.4   22.4   291   11.2 
2025-10-23 00:00 UT   10 28 39.2   +08 56 47     2.523    2.097   53.9   22.5   291   11.2 
2025-10-24 00:00 UT   10 30 28.2   +08 46 05     2.514    2.098   54.4   22.7   291   11.2 
2025-10-25 00:00 UT   10 32 16.6   +08 35 24     2.506    2.099   54.9   22.8   291   11.2 
2025-10-26 00:00 UT   10 34 04.6   +08 24 42     2.497    2.100   55.5   23.0   291   11.2 
2025-10-27 00:00 UT   10 35 52.1   +08 14 01     2.488    2.100   56.0   23.1   291   11.2 
2025-10-28 00:00 UT   10 37 39.0   +08 03 21     2.479    2.101   56.5   23.2   291   11.2 
2025-10-29 00:00 UT   10 39 25.5   +07 52 41     2.470    2.102   57.0   23.4   292   11.2 
2025-10-30 00:00 UT   10 41 11.5   +07 42 02     2.461    2.103   57.6   23.5   292   11.2 
2025-10-31 00:00 UT   10 42 56.9   +07 31 23     2.452    2.104   58.1   23.6   292   11.2 
2025-11-01 00:00 UT   10 44 41.9   +07 20 46     2.443    2.105   58.6   23.7   292   11.2 
2025-11-02 00:00 UT   10 46 26.3   +07 10 09     2.434    2.106   59.2   23.9   292   11.2 
2025-11-03 00:00 UT   10 48 10.2   +06 59 33     2.425    2.106   59.7   24.0   292   11.2 
2025-11-04 00:00 UT   10 49 53.6   +06 48 59     2.416    2.107   60.2   24.1   292   11.2 

    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.