(230) Athamantis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	18 Jun 2025	10.8	2.402 AU	1.425 AU	19h00m	-12°50'	159.2°	8.6°
Opposition	2 Jul 2025	10.5	2.392 AU	1.386 AU	18h46m	-12°04'	169.0°	4.6°

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)      : 139.09055
            M (Mean anomaly)                : 254.03342
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 199.24883
            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
2025-06-18 00:00 UT   19 00 59.1   -12 50 10     1.425    2.402  159.2    8.6   237   10.8 
2025-06-18 07:08 UT   19 00 43.5   -12 49 01     1.424    2.402  159.5    8.5   236   10.8 
2025-06-19 00:00 UT   19 00 06.2   -12 46 21     1.421    2.401  160.2    8.2   235   10.7 
2025-06-20 00:00 UT   18 59 12.4   -12 42 37     1.416    2.401  161.2    7.9   233   10.7 
2025-06-21 00:00 UT   18 58 17.5   -12 38 59     1.413    2.400  162.1    7.5   231   10.7 
2025-06-22 00:00 UT   18 57 21.7   -12 35 27     1.409    2.399  163.0    7.1   228   10.7 
2025-06-23 00:00 UT   18 56 25.1   -12 32 00     1.406    2.399  163.9    6.8   226   10.6 
2025-06-24 00:00 UT   18 55 27.7   -12 28 40     1.403    2.398  164.7    6.4   223   10.6 
2025-06-25 00:00 UT   18 54 29.6   -12 25 25     1.400    2.397  165.5    6.1   219   10.6 
2025-06-26 00:00 UT   18 53 30.8   -12 22 17     1.397    2.397  166.3    5.8   216   10.6 
2025-06-27 00:00 UT   18 52 31.5   -12 19 14     1.395    2.396  166.9    5.5   212   10.6 
2025-06-28 00:00 UT   18 51 31.8   -12 16 18     1.393    2.395  167.5    5.3   207   10.5 
2025-06-29 00:00 UT   18 50 31.6   -12 13 28     1.391    2.395  168.1    5.0   202   10.5 
2025-06-30 00:00 UT   18 49 31.1   -12 10 44     1.389    2.394  168.5    4.9   196   10.5 
2025-07-01 00:00 UT   18 48 30.3   -12 08 07     1.388    2.393  168.8    4.7   191   10.5 
2025-07-02 00:00 UT   18 47 29.4   -12 05 36     1.387    2.393  169.0    4.7   185   10.5 
2025-07-03 00:00 UT   18 46 28.4   -12 03 12     1.386    2.392  169.1    4.6   178   10.5 
2025-07-04 00:00 UT   18 45 27.4   -12 00 54     1.385    2.391  169.0    4.7   172   10.5 
2025-07-05 00:00 UT   18 44 26.4   -11 58 43     1.385    2.391  168.8    4.7   166   10.5 
2025-07-06 00:00 UT   18 43 25.6   -11 56 38     1.385    2.390  168.5    4.9   160   10.5 
2025-07-07 00:00 UT   18 42 25.0   -11 54 39     1.385    2.389  168.1    5.0   155   10.5 
2025-07-08 00:00 UT   18 41 24.7   -11 52 47     1.386    2.388  167.6    5.3   150   10.5 
2025-07-09 00:00 UT   18 40 24.7   -11 51 02     1.386    2.388  167.0    5.5   145   10.5 
2025-07-10 00:00 UT   18 39 25.2   -11 49 23     1.387    2.387  166.3    5.8   141   10.6 
2025-07-11 00:00 UT   18 38 26.2   -11 47 51     1.389    2.386  165.6    6.1   137   10.6 
2025-07-12 00:00 UT   18 37 27.7   -11 46 25     1.390    2.386  164.8    6.4   134   10.6 
2025-07-13 00:00 UT   18 36 29.9   -11 45 06     1.392    2.385  163.9    6.8   131   10.6 
2025-07-14 00:00 UT   18 35 32.8   -11 43 53     1.394    2.384  163.1    7.1   128   10.6 
2025-07-15 00:00 UT   18 34 36.5   -11 42 47     1.396    2.384  162.1    7.5   126   10.7 
2025-07-16 00:00 UT   18 33 41.0   -11 41 47     1.398    2.383  161.2    7.9   123   10.7 
2025-07-17 00:00 UT   18 32 46.5   -11 40 54     1.401    2.382  160.3    8.3   121   10.7 
2025-07-18 00:00 UT   18 31 52.9   -11 40 07     1.404    2.382  159.3    8.7   119   10.7 

    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.