(404) Arsinoe
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	5 Nov 2025	14.4	2.921 AU	2.465 AU	22h37m	-26°26'	107.6°	18.9°
Opposition	15 Nov 2026	13.5	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
2025-11-05 00:00 UT   22 37 02.9   -26 26 31     2.465    2.921  107.6   18.9    62   14.4 
2025-11-05 19:28 UT   22 37 15.2   -26 21 14     2.476    2.922  106.9   18.9    62   14.4 
2025-11-06 00:00 UT   22 37 18.2   -26 19 59     2.479    2.923  106.7   19.0    62   14.4 
2025-11-07 00:00 UT   22 37 34.8   -26 13 21     2.494    2.924  105.9   19.0    62   14.4 
2025-11-08 00:00 UT   22 37 52.7   -26 06 37     2.508    2.926  105.0   19.1    63   14.4 
2025-11-09 00:00 UT   22 38 11.9   -25 59 47     2.523    2.927  104.2   19.2    63   14.4 
2025-11-10 00:00 UT   22 38 32.3   -25 52 51     2.537    2.929  103.3   19.2    63   14.4 
2025-11-11 00:00 UT   22 38 53.9   -25 45 49     2.552    2.930  102.5   19.3    64   14.4 
2025-11-12 00:00 UT   22 39 16.7   -25 38 42     2.567    2.931  101.6   19.3    64   14.5 
2025-11-13 00:00 UT   22 39 40.8   -25 31 30     2.581    2.933  100.8   19.4    64   14.5 
2025-11-14 00:00 UT   22 40 06.0   -25 24 12     2.596    2.934  100.0   19.4    64   14.5 
2025-11-15 00:00 UT   22 40 32.4   -25 16 49     2.611    2.936   99.2   19.4    65   14.5 
2025-11-16 00:00 UT   22 40 59.9   -25 09 21     2.626    2.937   98.3   19.5    65   14.5 
2025-11-17 00:00 UT   22 41 28.5   -25 01 48     2.641    2.939   97.5   19.5    65   14.5 
2025-11-18 00:00 UT   22 41 58.3   -24 54 11     2.656    2.940   96.7   19.5    65   14.5 
2025-11-19 00:00 UT   22 42 29.2   -24 46 29     2.671    2.941   95.9   19.5    65   14.6 
2025-11-20 00:00 UT   22 43 01.2   -24 38 42     2.686    2.943   95.1   19.5    66   14.6 
2025-11-21 00:00 UT   22 43 34.2   -24 30 51     2.701    2.944   94.3   19.6    66   14.6 
2025-11-22 00:00 UT   22 44 08.3   -24 22 55     2.716    2.946   93.5   19.6    66   14.6 
2025-11-23 00:00 UT   22 44 43.4   -24 14 55     2.731    2.947   92.7   19.6    66   14.6 
2025-11-24 00:00 UT   22 45 19.5   -24 06 52     2.746    2.948   91.9   19.6    67   14.6 
2025-11-25 00:00 UT   22 45 56.6   -23 58 44     2.761    2.950   91.1   19.5    67   14.6 
2025-11-26 00:00 UT   22 46 34.7   -23 50 32     2.776    2.951   90.3   19.5    67   14.7 
2025-11-27 00:00 UT   22 47 13.8   -23 42 17     2.791    2.953   89.5   19.5    67   14.7 
2025-11-28 00:00 UT   22 47 53.8   -23 33 58     2.806    2.954   88.7   19.5    67   14.7 
2025-11-29 00:00 UT   22 48 34.7   -23 25 36     2.822    2.955   87.9   19.5    68   14.7 
2025-11-30 00:00 UT   22 49 16.6   -23 17 10     2.837    2.957   87.2   19.5    68   14.7 
2025-12-01 00:00 UT   22 49 59.3   -23 08 40     2.852    2.958   86.4   19.4    68   14.7 
2025-12-02 00:00 UT   22 50 42.9   -23 00 08     2.867    2.959   85.6   19.4    68   14.7 
2025-12-03 00:00 UT   22 51 27.3   -22 51 32     2.882    2.961   84.8   19.4    68   14.7 
2025-12-04 00:00 UT   22 52 12.6   -22 42 53     2.897    2.962   84.1   19.3    68   14.7 
2025-12-05 00:00 UT   22 52 58.7   -22 34 12     2.912    2.963   83.3   19.3    69   14.8 

    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.