(221) Eos
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	31 Oct 2026	11.8	2.855 AU	1.888 AU	02h43m	-01°07'	163.9°	5.5°
Today	10 Nov 2026	11.9	2.864 AU	1.911 AU	02h35m	-01°43'	160.4°	6.7°

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)                : 0.1008881
            a (Semimajor axis)              : 3.0119012
            i (Inclination)                 : 10.89072
            Ω (Longitude of ascending node) : 141.71100
            ω (Argument of perihelion)      : 192.42898
            M (Mean anomaly)                : 26.70211
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 153.92290
            B (Latitude of perihelion)      : -2.33056
            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.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-11-10 00:00 UT   02 35 38.9   -01 43 17     1.911    2.864  160.4    6.7    17   11.9 
2026-11-10 06:45 UT   02 35 25.9   -01 44 07     1.912    2.864  160.2    6.7    18   11.9 
2026-11-11 00:00 UT   02 34 53.0   -01 46 10     1.915    2.865  159.7    6.9    20   11.9 
2026-11-12 00:00 UT   02 34 07.5   -01 48 52     1.919    2.865  159.0    7.1    22   11.9 
2026-11-13 00:00 UT   02 33 22.6   -01 51 23     1.923    2.866  158.2    7.4    25   12.0 
2026-11-14 00:00 UT   02 32 38.2   -01 53 43     1.928    2.867  157.4    7.6    27   12.0 
2026-11-15 00:00 UT   02 31 54.3   -01 55 51     1.933    2.868  156.6    7.9    29   12.0 
2026-11-16 00:00 UT   02 31 11.1   -01 57 48     1.938    2.869  155.8    8.1    31   12.0 
2026-11-17 00:00 UT   02 30 28.6   -01 59 33     1.944    2.870  154.9    8.4    33   12.0 
2026-11-18 00:00 UT   02 29 46.9   -02 01 07     1.950    2.871  154.0    8.7    35   12.0 
2026-11-19 00:00 UT   02 29 05.9   -02 02 29     1.956    2.872  153.1    9.0    37   12.1 
2026-11-20 00:00 UT   02 28 25.7   -02 03 39     1.962    2.873  152.1    9.3    38   12.1 
2026-11-21 00:00 UT   02 27 46.4   -02 04 38     1.968    2.874  151.2    9.5    40   12.1 
2026-11-22 00:00 UT   02 27 07.9   -02 05 25     1.975    2.875  150.2    9.8    41   12.1 
2026-11-23 00:00 UT   02 26 30.4   -02 06 00     1.982    2.876  149.3   10.1    42   12.1 
2026-11-24 00:00 UT   02 25 53.9   -02 06 24     1.989    2.877  148.3   10.4    44   12.2 
2026-11-25 00:00 UT   02 25 18.3   -02 06 36     1.997    2.878  147.3   10.7    45   12.2 
2026-11-26 00:00 UT   02 24 43.8   -02 06 37     2.004    2.878  146.3   11.0    46   12.2 
2026-11-27 00:00 UT   02 24 10.3   -02 06 26     2.012    2.879  145.4   11.2    47   12.2 
2026-11-28 00:00 UT   02 23 37.9   -02 06 03     2.020    2.880  144.4   11.5    48   12.2 
2026-11-29 00:00 UT   02 23 06.6   -02 05 29     2.029    2.881  143.4   11.8    49   12.3 
2026-11-30 00:00 UT   02 22 36.5   -02 04 44     2.037    2.882  142.4   12.1    50   12.3 
2026-12-01 00:00 UT   02 22 07.5   -02 03 48     2.046    2.883  141.4   12.3    50   12.3 
2026-12-02 00:00 UT   02 21 39.7   -02 02 40     2.055    2.884  140.4   12.6    51   12.3 
2026-12-03 00:00 UT   02 21 13.1   -02 01 22     2.064    2.885  139.4   12.9    52   12.3 
2026-12-04 00:00 UT   02 20 47.7   -01 59 52     2.074    2.886  138.4   13.1    53   12.4 
2026-12-05 00:00 UT   02 20 23.5   -01 58 12     2.083    2.887  137.4   13.4    53   12.4 
2026-12-06 00:00 UT   02 20 00.6   -01 56 20     2.093    2.888  136.4   13.6    54   12.4 
2026-12-07 00:00 UT   02 19 39.1   -01 54 18     2.103    2.889  135.4   13.9    55   12.4 
2026-12-08 00:00 UT   02 19 18.8   -01 52 05     2.113    2.890  134.4   14.1    55   12.4 
2026-12-09 00:00 UT   02 18 59.8   -01 49 42     2.124    2.891  133.4   14.3    56   12.5 
2026-12-10 00:00 UT   02 18 42.1   -01 47 09     2.134    2.892  132.4   14.6    56   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.