(230) Athamantis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	2 Jul 2025	10.5	2.392 AU	1.386 AU	18h46m	-12°04'	169.0°	4.6°
Today	19 Jul 2025	10.7	2.381 AU	1.407 AU	18h31m	-11°39'	158.3°	9.1°

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)                : 0.0611874
            a (Semimajor axis)              : 2.3825833
            i (Inclination)                 : 9.45497
            Ω (Longitude of ascending node) : 239.77081
            ω (Argument of perihelion)      : 139.09056
            M (Mean anomaly)                : 254.03342
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 199.24884
            B (Latitude of perihelion)      : 6.17562
            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. 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
2025-07-19 00:00 UT   18 31 00.3   -11 39 26     1.407    2.381  158.3    9.1   118   10.7 
2025-07-19 01:09 UT   18 30 57.8   -11 39 24     1.407    2.381  158.2    9.1   118   10.7 
2025-07-20 00:00 UT   18 30 08.8   -11 38 52     1.410    2.380  157.3    9.5   116   10.8 
2025-07-21 00:00 UT   18 29 18.5   -11 38 24     1.414    2.380  156.3    9.9   115   10.8 
2025-07-22 00:00 UT   18 28 29.4   -11 38 02     1.418    2.379  155.3   10.3   114   10.8 
2025-07-23 00:00 UT   18 27 41.5   -11 37 47     1.422    2.378  154.2   10.7   112   10.8 
2025-07-24 00:00 UT   18 26 55.0   -11 37 37     1.426    2.378  153.2   11.1   111   10.8 
2025-07-25 00:00 UT   18 26 09.9   -11 37 34     1.431    2.377  152.2   11.5   110   10.9 
2025-07-26 00:00 UT   18 25 26.2   -11 37 36     1.436    2.376  151.2   11.9   109   10.9 
2025-07-27 00:00 UT   18 24 43.9   -11 37 44     1.440    2.376  150.1   12.3   109   10.9 
2025-07-28 00:00 UT   18 24 03.2   -11 37 57     1.446    2.375  149.1   12.7   108   10.9 
2025-07-29 00:00 UT   18 23 24.1   -11 38 16     1.451    2.374  148.1   13.1   107   11.0 
2025-07-30 00:00 UT   18 22 46.5   -11 38 41     1.457    2.373  147.0   13.5   106   11.0 
2025-07-31 00:00 UT   18 22 10.6   -11 39 10     1.462    2.373  146.0   13.8   106   11.0 
2025-08-01 00:00 UT   18 21 36.4   -11 39 45     1.468    2.372  145.0   14.2   105   11.0 
2025-08-02 00:00 UT   18 21 03.8   -11 40 24     1.475    2.371  143.9   14.6   104   11.0 
2025-08-03 00:00 UT   18 20 33.0   -11 41 08     1.481    2.371  142.9   15.0   104   11.1 
2025-08-04 00:00 UT   18 20 03.9   -11 41 57     1.487    2.370  141.9   15.3   103   11.1 
2025-08-05 00:00 UT   18 19 36.5   -11 42 51     1.494    2.369  140.9   15.7   103   11.1 
2025-08-06 00:00 UT   18 19 10.9   -11 43 48     1.501    2.369  139.9   16.0   102   11.1 
2025-08-07 00:00 UT   18 18 47.1   -11 44 50     1.508    2.368  138.9   16.4   102   11.1 
2025-08-08 00:00 UT   18 18 25.2   -11 45 56     1.515    2.367  137.9   16.7   101   11.2 
2025-08-09 00:00 UT   18 18 05.0   -11 47 06     1.523    2.367  136.9   17.0   101   11.2 
2025-08-10 00:00 UT   18 17 46.6   -11 48 20     1.530    2.366  135.9   17.3   100   11.2 
2025-08-11 00:00 UT   18 17 30.1   -11 49 37     1.538    2.365  134.9   17.7   100   11.2 
2025-08-12 00:00 UT   18 17 15.4   -11 50 58     1.546    2.365  134.0   18.0   100   11.2 
2025-08-13 00:00 UT   18 17 02.5   -11 52 22     1.554    2.364  133.0   18.3    99   11.3 
2025-08-14 00:00 UT   18 16 51.5   -11 53 50     1.562    2.363  132.0   18.6    99   11.3 
2025-08-15 00:00 UT   18 16 42.3   -11 55 20     1.570    2.363  131.1   18.9    98   11.3 
2025-08-16 00:00 UT   18 16 35.0   -11 56 54     1.579    2.362  130.1   19.1    98   11.3 
2025-08-17 00:00 UT   18 16 29.5   -11 58 30     1.588    2.361  129.2   19.4    98   11.4 
2025-08-18 00:00 UT   18 16 25.9   -12 00 09     1.596    2.361  128.2   19.7    97   11.4 

    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.