(20) Massalia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	9 May 2025	11.1	2.095 AU	3.035 AU	04h16m	+20°55'	17.6°	8.4°
Opposition	21 Mar 2026	9.0	2.287 AU	1.291 AU	12h01m	-00°47'	179.4°	0.3°

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)                : 0.1438882
            a (Semimajor axis)              : 2.4087525
            i (Inclination)                 : 0.70931
            Ω (Longitude of ascending node) : 205.97786
            ω (Argument of perihelion)      : 257.33745
            M (Mean anomaly)                : 337.16976
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 283.31437
            B (Latitude of perihelion)      : -0.69206
            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. A more printer-friendly version of the same chart can be found below.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-05-09 00:00 UT   04 16 07.4   +20 55 22     3.035    2.095   17.6    8.4    81   11.1 
2025-05-09 21:41 UT   04 18 10.7   +21 00 20     3.038    2.095   17.2    8.2    81   11.1 
2025-05-10 00:00 UT   04 18 23.8   +21 00 51     3.038    2.095   17.2    8.2    81   11.1 
2025-05-11 00:00 UT   04 20 40.6   +21 06 14     3.041    2.094   16.7    8.0    82   11.1 
2025-05-12 00:00 UT   04 22 57.6   +21 11 29     3.043    2.093   16.3    7.8    82   11.1 
2025-05-13 00:00 UT   04 25 14.9   +21 16 38     3.046    2.092   15.9    7.6    82   11.1 
2025-05-14 00:00 UT   04 27 32.5   +21 21 40     3.048    2.092   15.4    7.4    82   11.1 
2025-05-15 00:00 UT   04 29 50.3   +21 26 36     3.051    2.091   15.0    7.2    83   11.1 
2025-05-16 00:00 UT   04 32 08.5   +21 31 24     3.053    2.090   14.6    7.0    83   11.1 
2025-05-17 00:00 UT   04 34 26.8   +21 36 06     3.055    2.089   14.2    6.8    83   11.1 
2025-05-18 00:00 UT   04 36 45.5   +21 40 40     3.057    2.089   13.8    6.6    83   11.1 
2025-05-19 00:00 UT   04 39 04.3   +21 45 07     3.059    2.088   13.3    6.4    84   11.1 
2025-05-20 00:00 UT   04 41 23.5   +21 49 27     3.061    2.087   12.9    6.2    84   11.0 
2025-05-21 00:00 UT   04 43 42.9   +21 53 40     3.063    2.087   12.5    6.0    84   11.0 
2025-05-22 00:00 UT   04 46 02.5   +21 57 46     3.065    2.086   12.1    5.8    85   11.0 
2025-05-23 00:00 UT   04 48 22.3   +22 01 44     3.067    2.085   11.7    5.6    85   11.0 
2025-05-24 00:00 UT   04 50 42.4   +22 05 35     3.068    2.085   11.3    5.4    85   11.0 

    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.