(230) Athamantis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	5 Sep 2026	11.9	2.252 AU	2.040 AU	04h47m	+24°44'	88.5°	26.6°
Opposition	5 Dec 2026	10.0	2.293 AU	1.309 AU	04h52m	+18°31'	175.9°	1.8°

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 Athamantis are:

            e (Eccentricity)                : 0.0609515
            a (Semimajor axis)              : 2.3819680
            i (Inclination)                 : 9.45497
            Ω (Longitude of ascending node) : 239.76225
            ω (Argument of perihelion)      : 139.21205
            M (Mean anomaly)                : 1.12577
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 199.36152
            B (Latitude of perihelion)      : 6.16043
            P (Orbital period in years)     : 3.68            
        

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
2026-09-05 00:00 UT   04 47 38.8   +24 44 31     2.040    2.252   88.5   26.6   263   11.9 
2026-09-05 08:17 UT   04 48 05.7   +24 44 27     2.036    2.252   88.7   26.6   263   11.9 
2026-09-06 00:00 UT   04 48 56.3   +24 44 18     2.029    2.252   89.2   26.6   263   11.9 
2026-09-07 00:00 UT   04 50 12.7   +24 43 58     2.017    2.252   89.9   26.6   263   11.9 
2026-09-08 00:00 UT   04 51 28.1   +24 43 33     2.005    2.253   90.5   26.6   263   11.9 
2026-09-09 00:00 UT   04 52 42.2   +24 43 02     1.994    2.253   91.2   26.6   263   11.9 
2026-09-10 00:00 UT   04 53 55.2   +24 42 25     1.982    2.253   91.9   26.5   263   11.9 
2026-09-11 00:00 UT   04 55 07.0   +24 41 42     1.971    2.254   92.6   26.5   264   11.9 
2026-09-12 00:00 UT   04 56 17.6   +24 40 53     1.959    2.254   93.3   26.5   264   11.9 
2026-09-13 00:00 UT   04 57 26.9   +24 39 59     1.947    2.254   94.1   26.4   264   11.8 
2026-09-14 00:00 UT   04 58 35.0   +24 38 59     1.936    2.255   94.8   26.4   264   11.8 
2026-09-15 00:00 UT   04 59 41.8   +24 37 53     1.924    2.255   95.5   26.4   264   11.8 
2026-09-16 00:00 UT   05 00 47.3   +24 36 42     1.913    2.255   96.2   26.3   264   11.8 
2026-09-17 00:00 UT   05 01 51.4   +24 35 25     1.901    2.256   97.0   26.3   264   11.8 
2026-09-18 00:00 UT   05 02 54.2   +24 34 02     1.890    2.256   97.7   26.2   264   11.8 
2026-09-19 00:00 UT   05 03 55.6   +24 32 34     1.878    2.257   98.4   26.1   264   11.8 
2026-09-20 00:00 UT   05 04 55.7   +24 30 60     1.867    2.257   99.2   26.1   264   11.7 
2026-09-21 00:00 UT   05 05 54.3   +24 29 20     1.855    2.257  100.0   26.0   264   11.7 
2026-09-22 00:00 UT   05 06 51.4   +24 27 36     1.844    2.258  100.7   25.9   264   11.7 
2026-09-23 00:00 UT   05 07 47.1   +24 25 45     1.833    2.258  101.5   25.8   265   11.7 
2026-09-24 00:00 UT   05 08 41.3   +24 23 50     1.821    2.258  102.3   25.7   265   11.7 
2026-09-25 00:00 UT   05 09 34.0   +24 21 48     1.810    2.259  103.1   25.6   265   11.7 
2026-09-26 00:00 UT   05 10 25.2   +24 19 42     1.799    2.259  103.8   25.5   265   11.6 
2026-09-27 00:00 UT   05 11 14.8   +24 17 30     1.787    2.260  104.6   25.4   265   11.6 
2026-09-28 00:00 UT   05 12 02.8   +24 15 13     1.776    2.260  105.4   25.3   265   11.6 
2026-09-29 00:00 UT   05 12 49.1   +24 12 50     1.765    2.260  106.2   25.2   265   11.6 
2026-09-30 00:00 UT   05 13 33.9   +24 10 22     1.754    2.261  107.1   25.1   265   11.6 
2026-10-01 00:00 UT   05 14 17.0   +24 07 49     1.743    2.261  107.9   24.9   265   11.6 
2026-10-02 00:00 UT   05 14 58.3   +24 05 10     1.732    2.261  108.7   24.8   265   11.5 
2026-10-03 00:00 UT   05 15 38.0   +24 02 26     1.721    2.262  109.6   24.6   265   11.5 
2026-10-04 00:00 UT   05 16 15.9   +23 59 37     1.710    2.262  110.4   24.5   265   11.5 
2026-10-05 00:00 UT   05 16 52.0   +23 56 43     1.699    2.263  111.2   24.3   265   11.5 

    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.