(404) Arsinoe
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	11 Jul 2026	15.2	3.114 AU	3.504 AU	03h19m	+07°07'	59.5°	16.3°
Opposition	15 Nov 2026	13.6	3.069 AU	2.097 AU	03h39m	+05°57'	166.8°	4.2°

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 Arsinoe are:

            e (Eccentricity)                : 0.2017865
            a (Semimajor axis)              : 2.5914457
            i (Inclination)                 : 14.09838
            Ω (Longitude of ascending node) : 92.46291
            ω (Argument of perihelion)      : 120.49000
            M (Mean anomaly)                : 171.14073
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 33.72470
            B (Latitude of perihelion)      : 12.11671
            P (Orbital period in years)     : 4.17            
        

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
2026-07-11 00:00 UT   03 19 47.8   +07 07 49     3.504    3.114   59.5   16.3   248   15.2 
2026-07-11 06:22 UT   03 20 05.2   +07 08 39     3.501    3.114   59.7   16.4   248   15.2 
2026-07-12 00:00 UT   03 20 53.4   +07 10 58     3.492    3.114   60.2   16.5   249   15.2 
2026-07-13 00:00 UT   03 21 58.6   +07 14 03     3.480    3.114   60.9   16.6   249   15.2 
2026-07-14 00:00 UT   03 23 03.4   +07 17 03     3.468    3.114   61.5   16.7   249   15.2 
2026-07-15 00:00 UT   03 24 07.7   +07 19 59     3.456    3.114   62.2   16.8   249   15.2 
2026-07-16 00:00 UT   03 25 11.6   +07 22 51     3.444    3.114   62.9   16.9   250   15.2 
2026-07-17 00:00 UT   03 26 15.0   +07 25 38     3.432    3.114   63.5   17.0   250   15.2 
2026-07-18 00:00 UT   03 27 17.9   +07 28 20     3.419    3.114   64.2   17.1   250   15.2 
2026-07-19 00:00 UT   03 28 20.4   +07 30 58     3.407    3.114   64.9   17.2   250   15.2 
2026-07-20 00:00 UT   03 29 22.3   +07 33 31     3.394    3.114   65.5   17.3   251   15.2 
2026-07-21 00:00 UT   03 30 23.7   +07 36 00     3.382    3.114   66.2   17.4   251   15.2 
2026-07-22 00:00 UT   03 31 24.6   +07 38 25     3.369    3.114   66.9   17.5   251   15.2 
2026-07-23 00:00 UT   03 32 25.0   +07 40 44     3.356    3.114   67.6   17.6   251   15.1 
2026-07-24 00:00 UT   03 33 24.9   +07 42 60     3.344    3.114   68.3   17.6   252   15.1 
2026-07-25 00:00 UT   03 34 24.2   +07 45 11     3.331    3.114   69.0   17.7   252   15.1 
2026-07-26 00:00 UT   03 35 22.9   +07 47 17     3.318    3.114   69.7   17.8   252   15.1 
2026-07-27 00:00 UT   03 36 21.1   +07 49 19     3.305    3.114   70.4   17.9   252   15.1 
2026-07-28 00:00 UT   03 37 18.7   +07 51 16     3.292    3.114   71.1   18.0   252   15.1 
2026-07-29 00:00 UT   03 38 15.8   +07 53 09     3.279    3.114   71.8   18.0   253   15.1 
2026-07-30 00:00 UT   03 39 12.2   +07 54 57     3.265    3.114   72.5   18.1   253   15.1 
2026-07-31 00:00 UT   03 40 08.0   +07 56 41     3.252    3.114   73.2   18.2   253   15.1 
2026-08-01 00:00 UT   03 41 03.3   +07 58 21     3.239    3.114   73.9   18.3   253   15.1 
2026-08-02 00:00 UT   03 41 57.8   +07 59 55     3.225    3.114   74.6   18.3   254   15.1 
2026-08-03 00:00 UT   03 42 51.8   +08 01 26     3.212    3.113   75.3   18.4   254   15.1 
2026-08-04 00:00 UT   03 43 45.1   +08 02 52     3.198    3.113   76.0   18.4   254   15.1 
2026-08-05 00:00 UT   03 44 37.7   +08 04 13     3.185    3.113   76.8   18.5   254   15.1 
2026-08-06 00:00 UT   03 45 29.7   +08 05 30     3.171    3.113   77.5   18.5   254   15.1 
2026-08-07 00:00 UT   03 46 21.0   +08 06 42     3.158    3.113   78.2   18.6   255   15.0 
2026-08-08 00:00 UT   03 47 11.5   +08 07 50     3.144    3.113   78.9   18.6   255   15.0 
2026-08-09 00:00 UT   03 48 01.3   +08 08 53     3.130    3.113   79.7   18.7   255   15.0 
2026-08-10 00:00 UT   03 48 50.4   +08 09 52     3.116    3.113   80.4   18.7   255   15.0 

    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.