(221) Eos
ephemeris date magn radius delta ra dec elong phase
Today29 Mar 202412.63.205 AU2.256 AU13h54m+02°28'158.3°6.6°
Opposition12 Apr 202412.43.194 AU2.212 AU13h44m+04°01'166.1°4.3°
(221) Eos - 2024-03-29
astro.vanbuitenen.nl


 
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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 Eos are:

            e (Eccentricity)                : 0.1014603
            a (Semimajor axis)              : 3.0125883
            i (Inclination)                 : 10.88916
            Ω (Longitude of ascending node) : 141.72825
            ω (Argument of perihelion)      : 192.53814
            M (Mean anomaly)                : 235.83010
            Epoch                           : 2024 Mar 31

            L (Longitude of perihelion)     : 154.04759
            B (Latitude of perihelion)      : -2.35038
            P (Orbital period in years)     : 5.23            
        

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. A more printer-friendly version of the same chart can be found below.




Ephemerides:
Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2024-03-29 00:00 UT   13 54 41.4   +02 28 20     2.256    3.205  158.3    6.6   255   12.6 
2024-03-29 13:23 UT   13 54 21.1   +02 32 05     2.253    3.205  158.8    6.5   253   12.5 
2024-03-30 00:00 UT   13 54 04.9   +02 35 03     2.251    3.204  159.2    6.4   252   12.5 
2024-03-31 00:00 UT   13 53 27.8   +02 41 45     2.247    3.204  160.0    6.1   250   12.5 
2024-04-01 00:00 UT   13 52 49.8   +02 48 25     2.242    3.203  160.9    5.9   248   12.5 
2024-04-02 00:00 UT   13 52 11.2   +02 55 04     2.238    3.202  161.6    5.6   245   12.5 
2024-04-03 00:00 UT   13 51 32.0   +03 01 40     2.234    3.202  162.4    5.4   242   12.5 
2024-04-04 00:00 UT   13 50 52.1   +03 08 14     2.231    3.201  163.1    5.2   239   12.5 
2024-04-05 00:00 UT   13 50 11.6   +03 14 45     2.227    3.200  163.7    5.0   235   12.4 
2024-04-06 00:00 UT   13 49 30.6   +03 21 13     2.224    3.199  164.3    4.9   232   12.4 
2024-04-07 00:00 UT   13 48 49.1   +03 27 37     2.222    3.199  164.8    4.7   228   12.4 
2024-04-08 00:00 UT   13 48 07.1   +03 33 57     2.219    3.198  165.2    4.6   223   12.4 
2024-04-09 00:00 UT   13 47 24.8   +03 40 13     2.217    3.197  165.6    4.5   219   12.4 
2024-04-10 00:00 UT   13 46 42.0   +03 46 25     2.215    3.196  165.9    4.4   214   12.4 
2024-04-11 00:00 UT   13 45 59.0   +03 52 31     2.214    3.195  166.0    4.3   209   12.4 
2024-04-12 00:00 UT   13 45 15.7   +03 58 32     2.213    3.195  166.1    4.3   204   12.4 
2024-04-13 00:00 UT   13 44 32.1   +04 04 28     2.212    3.194  166.1    4.3   199   12.4 
2024-04-14 00:00 UT   13 43 48.4   +04 10 17     2.211    3.193  166.0    4.4   195   12.4 
2024-04-15 00:00 UT   13 43 04.5   +04 16 00     2.210    3.192  165.8    4.4   190   12.4 
2024-04-16 00:00 UT   13 42 20.6   +04 21 37     2.210    3.192  165.5    4.5   185   12.4 
2024-04-17 00:00 UT   13 41 36.6   +04 27 07     2.210    3.191  165.1    4.6   181   12.4 
2024-04-18 00:00 UT   13 40 52.6   +04 32 29     2.211    3.190  164.6    4.8   177   12.4 
2024-04-19 00:00 UT   13 40 08.6   +04 37 44     2.212    3.189  164.1    5.0   173   12.4 
2024-04-20 00:00 UT   13 39 24.8   +04 42 52     2.213    3.189  163.5    5.1   169   12.4 
2024-04-21 00:00 UT   13 38 41.1   +04 47 52     2.214    3.188  162.8    5.3   166   12.4 
2024-04-22 00:00 UT   13 37 57.5   +04 52 43     2.215    3.187  162.1    5.6   163   12.5 
2024-04-23 00:00 UT   13 37 14.2   +04 57 26     2.217    3.186  161.4    5.8   160   12.5 
2024-04-24 00:00 UT   13 36 31.1   +05 02 01     2.219    3.185  160.6    6.0   157   12.5 
2024-04-25 00:00 UT   13 35 48.4   +05 06 27     2.222    3.185  159.8    6.3   155   12.5 
2024-04-26 00:00 UT   13 35 06.0   +05 10 44     2.224    3.184  158.9    6.5   152   12.5 
2024-04-27 00:00 UT   13 34 23.9   +05 14 52     2.227    3.183  158.1    6.8   150   12.5 
2024-04-28 00:00 UT   13 33 42.3   +05 18 51     2.230    3.182  157.2    7.1   148   12.5 


    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.