(230) Athamantis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	15 Oct 2026	11.3	2.267 AU	1.595 AU	05h21m	+23°22'	120.2°	22.4°
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
2026-10-15 00:00 UT   05 21 09.4   +23 22 55     1.595    2.267  120.2   22.4   266   11.3 
2026-10-15 00:54 UT   05 21 10.0   +23 22 46     1.595    2.267  120.2   22.3   266   11.3 
2026-10-16 00:00 UT   05 21 24.3   +23 19 04     1.585    2.267  121.1   22.1   266   11.3 
2026-10-17 00:00 UT   05 21 37.2   +23 15 08     1.575    2.268  122.1   21.9   266   11.3 
2026-10-18 00:00 UT   05 21 48.0   +23 11 07     1.566    2.268  123.0   21.6   266   11.2 
2026-10-19 00:00 UT   05 21 56.8   +23 07 01     1.556    2.269  124.0   21.3   266   11.2 
2026-10-20 00:00 UT   05 22 03.5   +23 02 50     1.546    2.269  125.0   21.1   266   11.2 
2026-10-21 00:00 UT   05 22 08.1   +22 58 34     1.537    2.270  125.9   20.8   266   11.2 
2026-10-22 00:00 UT   05 22 10.6   +22 54 13     1.528    2.270  126.9   20.5   266   11.1 
2026-10-23 00:00 UT   05 22 11.0   +22 49 47     1.519    2.270  127.9   20.2   267   11.1 
2026-10-24 00:00 UT   05 22 09.3   +22 45 16     1.510    2.271  128.9   19.9   267   11.1 
2026-10-25 00:00 UT   05 22 05.5   +22 40 40     1.501    2.271  130.0   19.6   267   11.1 
2026-10-26 00:00 UT   05 21 59.6   +22 35 59     1.492    2.272  131.0   19.3   267   11.1 
2026-10-27 00:00 UT   05 21 51.5   +22 31 14     1.484    2.272  132.0   19.0   267   11.0 
2026-10-28 00:00 UT   05 21 41.3   +22 26 23     1.475    2.273  133.1   18.6   267   11.0 
2026-10-29 00:00 UT   05 21 29.0   +22 21 27     1.467    2.273  134.1   18.3   267   11.0 
2026-10-30 00:00 UT   05 21 14.6   +22 16 27     1.459    2.274  135.2   17.9   267   11.0 
2026-10-31 00:00 UT   05 20 58.1   +22 11 21     1.451    2.274  136.2   17.6   267   10.9 
2026-11-01 00:00 UT   05 20 39.4   +22 06 11     1.443    2.275  137.3   17.2   267   10.9 
2026-11-02 00:00 UT   05 20 18.6   +22 00 56     1.436    2.275  138.4   16.8   267   10.9 
2026-11-03 00:00 UT   05 19 55.7   +21 55 36     1.428    2.276  139.5   16.5   267   10.9 
2026-11-04 00:00 UT   05 19 30.7   +21 50 11     1.421    2.276  140.6   16.1   268   10.8 
2026-11-05 00:00 UT   05 19 03.7   +21 44 42     1.414    2.277  141.7   15.7   268   10.8 
2026-11-06 00:00 UT   05 18 34.6   +21 39 08     1.407    2.277  142.8   15.3   268   10.8 
2026-11-07 00:00 UT   05 18 03.4   +21 33 30     1.400    2.278  143.9   14.8   268   10.8 
2026-11-08 00:00 UT   05 17 30.3   +21 27 47     1.394    2.278  145.1   14.4   268   10.8 
2026-11-09 00:00 UT   05 16 55.2   +21 22 00     1.388    2.279  146.2   14.0   268   10.7 
2026-11-10 00:00 UT   05 16 18.2   +21 16 09     1.382    2.279  147.4   13.6   268   10.7 
2026-11-11 00:00 UT   05 15 39.4   +21 10 13     1.376    2.280  148.5   13.1   269   10.7 
2026-11-12 00:00 UT   05 14 58.7   +21 04 14     1.370    2.280  149.7   12.7   269   10.7 
2026-11-13 00:00 UT   05 14 16.2   +20 58 10     1.365    2.281  150.9   12.2   269   10.6 
2026-11-14 00:00 UT   05 13 32.0   +20 52 03     1.359    2.281  152.0   11.7   269   10.6 

    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.