(129) Antigone
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	10 Oct 2025	11.8	2.666 AU	2.132 AU	20h46m	-21°35'	111.5°	20.4°
Opposition	30 Oct 2026	12.0	3.365 AU	2.404 AU	02h41m	-02°19'	162.9°	5.0°

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 Antigone are:

            e (Eccentricity)                : 0.2130720
            a (Semimajor axis)              : 2.8683465
            i (Inclination)                 : 12.26995
            Ω (Longitude of ascending node) : 135.65431
            ω (Argument of perihelion)      : 110.53072
            M (Mean anomaly)                : 67.63476
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 66.62366
            B (Latitude of perihelion)      : 11.47964
            P (Orbital period in years)     : 4.86            
        

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
2025-10-10 00:00 UT   20 46 06.5   -21 35 12     2.132    2.666  111.5   20.4    73   11.8 
2025-10-10 04:38 UT   20 46 12.8   -21 35 15     2.135    2.666  111.3   20.4    73   11.8 
2025-10-11 00:00 UT   20 46 39.6   -21 35 28     2.147    2.668  110.6   20.5    73   11.8 
2025-10-12 00:00 UT   20 47 13.9   -21 35 36     2.162    2.670  109.8   20.6    73   11.8 
2025-10-13 00:00 UT   20 47 49.5   -21 35 37     2.176    2.672  108.9   20.7    73   11.9 
2025-10-14 00:00 UT   20 48 26.4   -21 35 30     2.191    2.674  108.1   20.8    73   11.9 
2025-10-15 00:00 UT   20 49 04.4   -21 35 15     2.206    2.677  107.2   20.8    73   11.9 
2025-10-16 00:00 UT   20 49 43.7   -21 34 53     2.221    2.679  106.4   20.9    73   11.9 
2025-10-17 00:00 UT   20 50 24.1   -21 34 23     2.236    2.681  105.6   21.0    73   11.9 
2025-10-18 00:00 UT   20 51 05.7   -21 33 46     2.251    2.683  104.7   21.0    73   11.9 
2025-10-19 00:00 UT   20 51 48.5   -21 33 01     2.266    2.685  103.9   21.1    73   12.0 
2025-10-20 00:00 UT   20 52 32.4   -21 32 10     2.281    2.688  103.1   21.2    73   12.0 
2025-10-21 00:00 UT   20 53 17.4   -21 31 11     2.296    2.690  102.2   21.2    73   12.0 
2025-10-22 00:00 UT   20 54 03.6   -21 30 05     2.312    2.692  101.4   21.2    73   12.0 
2025-10-23 00:00 UT   20 54 50.8   -21 28 51     2.327    2.694  100.6   21.3    73   12.0 
2025-10-24 00:00 UT   20 55 39.0   -21 27 31     2.342    2.697   99.8   21.3    73   12.1 
2025-10-25 00:00 UT   20 56 28.3   -21 26 04     2.358    2.699   99.0   21.3    73   12.1 
2025-10-26 00:00 UT   20 57 18.7   -21 24 30     2.373    2.701   98.2   21.4    73   12.1 
2025-10-27 00:00 UT   20 58 10.0   -21 22 49     2.389    2.703   97.4   21.4    73   12.1 
2025-10-28 00:00 UT   20 59 02.3   -21 21 02     2.404    2.705   96.6   21.4    73   12.1 
2025-10-29 00:00 UT   20 59 55.6   -21 19 08     2.420    2.708   95.8   21.4    73   12.1 
2025-10-30 00:00 UT   21 00 49.8   -21 17 07     2.435    2.710   95.0   21.4    73   12.2 
2025-10-31 00:00 UT   21 01 45.0   -21 15 00     2.451    2.712   94.3   21.4    73   12.2 
2025-11-01 00:00 UT   21 02 41.1   -21 12 47     2.466    2.714   93.5   21.4    73   12.2 
2025-11-02 00:00 UT   21 03 38.0   -21 10 27     2.482    2.716   92.7   21.4    73   12.2 
2025-11-03 00:00 UT   21 04 35.8   -21 08 01     2.498    2.719   91.9   21.4    73   12.2 
2025-11-04 00:00 UT   21 05 34.5   -21 05 29     2.513    2.721   91.2   21.4    73   12.2 
2025-11-05 00:00 UT   21 06 33.9   -21 02 50     2.529    2.723   90.4   21.4    73   12.2 
2025-11-06 00:00 UT   21 07 34.2   -21 00 06     2.545    2.725   89.6   21.3    73   12.3 
2025-11-07 00:00 UT   21 08 35.3   -20 57 16     2.560    2.727   88.9   21.3    73   12.3 
2025-11-08 00:00 UT   21 09 37.2   -20 54 19     2.576    2.730   88.1   21.3    73   12.3 
2025-11-09 00:00 UT   21 10 39.8   -20 51 17     2.592    2.732   87.4   21.2    73   12.3 

    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.