(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	8 Aug 2025	11.2	2.367 AU	1.515 AU	18h18m	-11°45'	137.9°	16.7°

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 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
2025-08-08 00:00 UT   18 18 25.2   -11 45 56     1.515    2.367  137.9   16.7   101   11.2 
2025-08-08 08:37 UT   18 18 17.7   -11 46 21     1.518    2.367  137.5   16.8   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 
2025-08-19 00:00 UT   18 16 24.1   -12 01 50     1.605    2.360  127.3   20.0    97   11.4 
2025-08-20 00:00 UT   18 16 24.1   -12 03 33     1.614    2.359  126.4   20.2    97   11.4 
2025-08-21 00:00 UT   18 16 26.0   -12 05 19     1.623    2.358  125.4   20.5    96   11.4 
2025-08-22 00:00 UT   18 16 29.8   -12 07 07     1.632    2.358  124.5   20.7    96   11.4 
2025-08-23 00:00 UT   18 16 35.4   -12 08 56     1.642    2.357  123.6   20.9    96   11.5 
2025-08-24 00:00 UT   18 16 42.8   -12 10 47     1.651    2.356  122.7   21.2    96   11.5 
2025-08-25 00:00 UT   18 16 52.1   -12 12 40     1.661    2.356  121.8   21.4    95   11.5 
2025-08-26 00:00 UT   18 17 03.1   -12 14 33     1.671    2.355  120.9   21.6    95   11.5 
2025-08-27 00:00 UT   18 17 15.9   -12 16 28     1.680    2.354  120.0   21.8    95   11.5 
2025-08-28 00:00 UT   18 17 30.6   -12 18 24     1.690    2.354  119.1   22.0    94   11.6 
2025-08-29 00:00 UT   18 17 47.0   -12 20 21     1.700    2.353  118.3   22.2    94   11.6 
2025-08-30 00:00 UT   18 18 05.1   -12 22 18     1.710    2.352  117.4   22.4    94   11.6 
2025-08-31 00:00 UT   18 18 25.0   -12 24 16     1.720    2.352  116.5   22.6    94   11.6 
2025-09-01 00:00 UT   18 18 46.6   -12 26 14     1.731    2.351  115.7   22.8    93   11.6 
2025-09-02 00:00 UT   18 19 09.9   -12 28 12     1.741    2.350  114.8   22.9    93   11.7 
2025-09-03 00:00 UT   18 19 34.9   -12 30 10     1.751    2.350  114.0   23.1    93   11.7 
2025-09-04 00:00 UT   18 20 01.6   -12 32 08     1.762    2.349  113.2   23.3    93   11.7 
2025-09-05 00:00 UT   18 20 29.9   -12 34 06     1.772    2.348  112.3   23.4    92   11.7 
2025-09-06 00:00 UT   18 20 59.8   -12 36 03     1.783    2.348  111.5   23.5    92   11.7 
2025-09-07 00:00 UT   18 21 31.3   -12 37 60     1.793    2.347  110.7   23.7    92   11.7 

    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.