(230) Athamantis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	22 Oct 2025	12.3	2.318 AU	2.303 AU	19h07m	-13°23'	78.4°	24.9°
Opposition	5 Dec 2026	10.1	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)                : 0.0611013
            a (Semimajor axis)              : 2.3823636
            i (Inclination)                 : 9.45464
            Ω (Longitude of ascending node) : 239.76741
            ω (Argument of perihelion)      : 139.16043
            M (Mean anomaly)                : 307.56137
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 199.31514
            B (Latitude of perihelion)      : 6.16668
            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
2025-10-22 00:00 UT   19 07 52.2   -13 23 50     2.303    2.318   78.4   24.9    81   12.3 
2025-10-22 20:15 UT   19 09 04.4   -13 23 25     2.313    2.317   77.8   24.8    81   12.3 
2025-10-23 00:00 UT   19 09 17.9   -13 23 19     2.315    2.317   77.7   24.8    81   12.3 
2025-10-24 00:00 UT   19 10 44.3   -13 22 44     2.326    2.316   77.1   24.7    81   12.3 
2025-10-25 00:00 UT   19 12 11.5   -13 22 03     2.337    2.316   76.5   24.7    81   12.3 
2025-10-26 00:00 UT   19 13 39.5   -13 21 17     2.348    2.315   75.8   24.6    80   12.3 
2025-10-27 00:00 UT   19 15 08.2   -13 20 25     2.359    2.315   75.2   24.5    80   12.3 
2025-10-28 00:00 UT   19 16 37.6   -13 19 28     2.371    2.314   74.6   24.5    80   12.3 
2025-10-29 00:00 UT   19 18 07.7   -13 18 25     2.382    2.313   74.0   24.4    80   12.3 
2025-10-30 00:00 UT   19 19 38.6   -13 17 17     2.393    2.313   73.3   24.3    79   12.3 
2025-10-31 00:00 UT   19 21 10.1   -13 16 04     2.404    2.312   72.7   24.2    79   12.4 
2025-11-01 00:00 UT   19 22 42.2   -13 14 44     2.415    2.311   72.1   24.1    79   12.4 
2025-11-02 00:00 UT   19 24 15.0   -13 13 19     2.426    2.311   71.5   24.0    79   12.4 
2025-11-03 00:00 UT   19 25 48.5   -13 11 49     2.437    2.310   70.9   23.9    79   12.4 
2025-11-04 00:00 UT   19 27 22.5   -13 10 13     2.447    2.310   70.3   23.8    78   12.4 
2025-11-05 00:00 UT   19 28 57.2   -13 08 31     2.458    2.309   69.7   23.7    78   12.4 
2025-11-06 00:00 UT   19 30 32.5   -13 06 43     2.469    2.308   69.1   23.6    78   12.4 
2025-11-07 00:00 UT   19 32 08.3   -13 04 50     2.480    2.308   68.5   23.5    78   12.4 
2025-11-08 00:00 UT   19 33 44.7   -13 02 50     2.490    2.307   67.9   23.4    77   12.4 
2025-11-09 00:00 UT   19 35 21.7   -13 00 45     2.501    2.307   67.3   23.3    77   12.4 
2025-11-10 00:00 UT   19 36 59.2   -12 58 34     2.512    2.306   66.7   23.2    77   12.4 
2025-11-11 00:00 UT   19 38 37.3   -12 56 17     2.522    2.305   66.1   23.1    77   12.4 
2025-11-12 00:00 UT   19 40 15.9   -12 53 54     2.533    2.305   65.5   23.0    76   12.4 
2025-11-13 00:00 UT   19 41 55.1   -12 51 26     2.543    2.304   64.9   22.9    76   12.4 

    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.