(404) Arsinoe
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	17 Oct 2026	14.1	3.088 AU	2.248 AU	04h02m	+06°51'	141.1°	11.7°
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
2026-10-17 00:00 UT   04 02 55.8   +06 51 26     2.248    3.088  141.1   11.7   276   14.1 
2026-10-17 08:31 UT   04 02 44.2   +06 50 36     2.245    3.088  141.5   11.6   276   14.0 
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 
2026-10-20 00:00 UT   04 01 12.6   +06 44 23     2.223    3.086  144.3   10.9   278   14.0 
2026-10-21 00:00 UT   04 00 35.6   +06 42 03     2.214    3.086  145.3   10.6   279   14.0 
2026-10-22 00:00 UT   03 59 57.4   +06 39 45     2.207    3.085  146.4   10.3   280   14.0 
2026-10-23 00:00 UT   03 59 17.9   +06 37 28     2.199    3.085  147.4   10.0   280   13.9 
2026-10-24 00:00 UT   03 58 37.2   +06 35 13     2.192    3.084  148.5    9.7   281   13.9 
2026-10-25 00:00 UT   03 57 55.2   +06 32 59     2.185    3.083  149.5    9.4   282   13.9 
2026-10-26 00:00 UT   03 57 12.2   +06 30 48     2.178    3.083  150.6    9.1   283   13.9 
2026-10-27 00:00 UT   03 56 27.9   +06 28 38     2.171    3.082  151.6    8.8   285   13.9 
2026-10-28 00:00 UT   03 55 42.6   +06 26 31     2.165    3.082  152.7    8.5   286   13.8 
2026-10-29 00:00 UT   03 54 56.2   +06 24 26     2.159    3.081  153.7    8.2   287   13.8 
2026-10-30 00:00 UT   03 54 08.8   +06 22 23     2.153    3.080  154.7    7.9   288   13.8 
2026-10-31 00:00 UT   03 53 20.3   +06 20 24     2.147    3.080  155.7    7.6   290   13.8 
2026-11-01 00:00 UT   03 52 30.9   +06 18 27     2.142    3.079  156.7    7.3   292   13.8 
2026-11-02 00:00 UT   03 51 40.6   +06 16 33     2.137    3.078  157.7    7.0   293   13.7 
2026-11-03 00:00 UT   03 50 49.3   +06 14 43     2.132    3.078  158.6    6.7   295   13.7 
2026-11-04 00:00 UT   03 49 57.3   +06 12 57     2.128    3.077  159.6    6.5   298   13.7 
2026-11-05 00:00 UT   03 49 04.4   +06 11 14     2.124    3.076  160.5    6.2   300   13.7 
2026-11-06 00:00 UT   03 48 10.7   +06 09 35     2.120    3.076  161.4    5.9   302   13.7 
2026-11-07 00:00 UT   03 47 16.4   +06 08 01     2.116    3.075  162.2    5.7   305   13.7 
2026-11-08 00:00 UT   03 46 21.4   +06 06 30     2.113    3.074  163.0    5.4   308   13.6 
2026-11-09 00:00 UT   03 45 25.7   +06 05 05     2.110    3.073  163.7    5.2   312   13.6 
2026-11-10 00:00 UT   03 44 29.6   +06 03 44     2.107    3.073  164.4    5.0   315   13.6 
2026-11-11 00:00 UT   03 43 32.9   +06 02 28     2.105    3.072  165.0    4.8   319   13.6 
2026-11-12 00:00 UT   03 42 35.8   +06 01 17     2.103    3.071  165.6    4.6   324   13.6 
2026-11-13 00:00 UT   03 41 38.4   +06 00 11     2.101    3.071  166.1    4.5   328   13.6 
2026-11-14 00:00 UT   03 40 40.6   +05 59 11     2.099    3.070  166.4    4.3   333   13.6 
2026-11-15 00:00 UT   03 39 42.5   +05 58 17     2.098    3.069  166.7    4.3   339   13.6 
2026-11-16 00:00 UT   03 38 44.2   +05 57 28     2.097    3.068  166.8    4.2   344   13.6 

    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.