(404) Arsinoe
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	19 Sep 2026	14.5	3.102 AU	2.563 AU	04h08m	+07°51'	113.4°	17.3°
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
2026-09-19 00:00 UT   04 08 46.3   +07 51 51     2.563    3.102  113.4   17.3   265   14.5 
2026-09-19 08:00 UT   04 08 48.6   +07 51 17     2.558    3.101  113.7   17.3   265   14.5 
2026-09-20 00:00 UT   04 08 52.7   +07 50 09     2.550    3.101  114.3   17.2   265   14.5 
2026-09-21 00:00 UT   04 08 57.8   +07 48 24     2.537    3.101  115.2   17.0   265   14.5 
2026-09-22 00:00 UT   04 09 01.5   +07 46 36     2.524    3.100  116.2   16.9   266   14.5 
2026-09-23 00:00 UT   04 09 03.9   +07 44 45     2.511    3.100  117.1   16.8   266   14.5 
2026-09-24 00:00 UT   04 09 04.9   +07 42 52     2.499    3.100  118.0   16.6   266   14.5 
2026-09-25 00:00 UT   04 09 04.5   +07 40 56     2.486    3.099  119.0   16.4   266   14.4 
2026-09-26 00:00 UT   04 09 02.8   +07 38 58     2.474    3.099  119.9   16.3   267   14.4 
2026-09-27 00:00 UT   04 08 59.6   +07 36 58     2.462    3.098  120.9   16.1   267   14.4 
2026-09-28 00:00 UT   04 08 55.1   +07 34 55     2.449    3.098  121.9   15.9   267   14.4 
2026-09-29 00:00 UT   04 08 49.1   +07 32 50     2.437    3.097  122.8   15.8   268   14.4 
2026-09-30 00:00 UT   04 08 41.7   +07 30 43     2.426    3.097  123.8   15.6   268   14.4 
2026-10-01 00:00 UT   04 08 32.9   +07 28 34     2.414    3.096  124.8   15.4   268   14.3 
2026-10-02 00:00 UT   04 08 22.7   +07 26 23     2.402    3.096  125.8   15.2   269   14.3 
2026-10-03 00:00 UT   04 08 11.0   +07 24 11     2.391    3.095  126.8   15.0   269   14.3 
2026-10-04 00:00 UT   04 07 57.8   +07 21 57     2.379    3.095  127.8   14.8   270   14.3 
2026-10-05 00:00 UT   04 07 43.2   +07 19 41     2.368    3.094  128.8   14.6   270   14.3 
2026-10-06 00:00 UT   04 07 27.2   +07 17 24     2.357    3.094  129.8   14.4   270   14.3 
2026-10-07 00:00 UT   04 07 09.7   +07 15 05     2.346    3.093  130.8   14.2   271   14.2 
2026-10-08 00:00 UT   04 06 50.7   +07 12 46     2.336    3.093  131.8   13.9   271   14.2 
2026-10-09 00:00 UT   04 06 30.3   +07 10 25     2.325    3.092  132.8   13.7   272   14.2 
2026-10-10 00:00 UT   04 06 08.5   +07 08 04     2.315    3.092  133.9   13.5   272   14.2 
2026-10-11 00:00 UT   04 05 45.2   +07 05 42     2.305    3.091  134.9   13.2   273   14.2 
2026-10-12 00:00 UT   04 05 20.5   +07 03 20     2.295    3.091  135.9   13.0   273   14.1 
2026-10-13 00:00 UT   04 04 54.3   +07 00 57     2.285    3.090  137.0   12.7   274   14.1 
2026-10-14 00:00 UT   04 04 26.8   +06 58 34     2.275    3.090  138.0   12.5   274   14.1 
2026-10-15 00:00 UT   04 03 57.8   +06 56 11     2.266    3.089  139.0   12.2   275   14.1 
2026-10-16 00:00 UT   04 03 27.5   +06 53 48     2.257    3.089  140.1   12.0   275   14.1 
2026-10-17 00:00 UT   04 02 55.8   +06 51 26     2.248    3.088  141.1   11.7   276   14.1 
2026-10-18 00:00 UT   04 02 22.7   +06 49 04     2.239    3.088  142.2   11.4   277   14.0 
2026-10-19 00:00 UT   04 01 48.3   +06 46 43     2.231    3.087  143.2   11.1   277   14.0 

    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.