(404) Arsinoe
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	12 Jun 2026	15.2	3.111 AU	3.801 AU	02h45m	+05°04'	41.2°	12.4°
Opposition	15 Nov 2026	13.6	3.069 AU	2.098 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)                : 0.2016098
            a (Semimajor axis)              : 2.5918971
            i (Inclination)                 : 14.09820
            Ω (Longitude of ascending node) : 92.46743
            ω (Argument of perihelion)      : 120.51372
            M (Mean anomaly)                : 123.86510
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 33.75326
            B (Latitude of perihelion)      : 12.11356
            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
2026-06-12 00:00 UT   02 45 34.3   +05 04 48     3.801    3.111   41.2   12.4   240   15.2 
2026-06-12 21:59 UT   02 46 42.8   +05 09 35     3.793    3.111   41.8   12.6   241   15.2 
2026-06-13 00:00 UT   02 46 49.1   +05 10 02     3.793    3.111   41.9   12.6   241   15.2 
2026-06-14 00:00 UT   02 48 03.6   +05 15 11     3.784    3.111   42.5   12.7   241   15.2 
2026-06-15 00:00 UT   02 49 17.9   +05 20 16     3.775    3.111   43.1   12.9   241   15.2 
2026-06-16 00:00 UT   02 50 31.9   +05 25 18     3.766    3.112   43.7   13.0   242   15.2 
2026-06-17 00:00 UT   02 51 45.8   +05 30 15     3.757    3.112   44.3   13.2   242   15.2 
2026-06-18 00:00 UT   02 52 59.3   +05 35 07     3.748    3.112   44.9   13.3   242   15.2 
2026-06-19 00:00 UT   02 54 12.6   +05 39 56     3.738    3.112   45.5   13.5   242   15.2 
2026-06-20 00:00 UT   02 55 25.7   +05 44 41     3.729    3.112   46.1   13.6   243   15.2 
2026-06-21 00:00 UT   02 56 38.4   +05 49 21     3.719    3.112   46.8   13.8   243   15.2 
2026-06-22 00:00 UT   02 57 50.9   +05 53 57     3.709    3.113   47.4   13.9   243   15.2 
2026-06-23 00:00 UT   02 59 03.1   +05 58 29     3.700    3.113   48.0   14.0   244   15.2 
2026-06-24 00:00 UT   03 00 15.1   +06 02 57     3.690    3.113   48.6   14.2   244   15.2 
2026-06-25 00:00 UT   03 01 26.7   +06 07 20     3.679    3.113   49.3   14.3   244   15.2 
2026-06-26 00:00 UT   03 02 38.0   +06 11 39     3.669    3.113   49.9   14.5   245   15.2 
2026-06-27 00:00 UT   03 03 49.1   +06 15 54     3.659    3.113   50.5   14.6   245   15.2 
2026-06-28 00:00 UT   03 04 59.8   +06 20 05     3.649    3.113   51.2   14.7   245   15.2 
2026-06-29 00:00 UT   03 06 10.2   +06 24 11     3.638    3.113   51.8   14.9   245   15.2 
2026-06-30 00:00 UT   03 07 20.3   +06 28 13     3.628    3.114   52.4   15.0   246   15.2 
2026-07-01 00:00 UT   03 08 30.1   +06 32 11     3.617    3.114   53.1   15.1   246   15.2 
2026-07-02 00:00 UT   03 09 39.5   +06 36 05     3.606    3.114   53.7   15.3   246   15.2 
2026-07-03 00:00 UT   03 10 48.6   +06 39 54     3.595    3.114   54.3   15.4   246   15.2 
2026-07-04 00:00 UT   03 11 57.3   +06 43 39     3.584    3.114   55.0   15.5   247   15.2 
2026-07-05 00:00 UT   03 13 05.7   +06 47 19     3.573    3.114   55.6   15.6   247   15.2 
2026-07-06 00:00 UT   03 14 13.7   +06 50 55     3.562    3.114   56.3   15.8   247   15.2 
2026-07-07 00:00 UT   03 15 21.4   +06 54 27     3.550    3.114   56.9   15.9   247   15.2 
2026-07-08 00:00 UT   03 16 28.7   +06 57 54     3.539    3.114   57.6   16.0   248   15.2 
2026-07-09 00:00 UT   03 17 35.5   +07 01 17     3.527    3.114   58.2   16.1   248   15.2 
2026-07-10 00:00 UT   03 18 42.0   +07 04 36     3.516    3.114   58.9   16.2   248   15.2 

    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.