(23) Thalia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	17 Sep 2025	12.9	3.199 AU	2.879 AU	18h15m	-31°23'	99.3°	18.1°
Opposition	9 Sep 2026	11.5	3.036 AU	2.051 AU	23h37m	-18°35'	165.2°	4.9°

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 Thalia are:

            e (Eccentricity)                : 0.2312418
            a (Semimajor axis)              : 2.6288771
            i (Inclination)                 : 10.10821
            Ω (Longitude of ascending node) : 66.48766
            ω (Argument of perihelion)      : 61.63368
            M (Mean anomaly)                : 170.19674
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 127.74502
            B (Latitude of perihelion)      : 8.88398
            P (Orbital period in years)     : 4.26            
        

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
2025-09-17 00:00 UT   18 15 47.2   -31 23 52     2.879    3.199   99.3   18.1    87   12.9 
2025-09-17 22:08 UT   18 16 16.7   -31 22 39     2.893    3.200   98.5   18.1    87   12.9 
2025-09-18 00:00 UT   18 16 19.2   -31 22 33     2.894    3.200   98.4   18.1    87   12.9 
2025-09-19 00:00 UT   18 16 52.5   -31 21 13     2.909    3.201   97.6   18.1    87   12.9 
2025-09-20 00:00 UT   18 17 26.9   -31 19 52     2.924    3.201   96.8   18.2    87   12.9 
2025-09-21 00:00 UT   18 18 02.5   -31 18 30     2.939    3.202   95.9   18.2    87   12.9 
2025-09-22 00:00 UT   18 18 39.3   -31 17 08     2.954    3.203   95.1   18.2    87   13.0 
2025-09-23 00:00 UT   18 19 17.2   -31 15 45     2.969    3.203   94.2   18.2    87   13.0 
2025-09-24 00:00 UT   18 19 56.3   -31 14 22     2.984    3.204   93.4   18.2    88   13.0 
2025-09-25 00:00 UT   18 20 36.5   -31 12 57     2.999    3.205   92.6   18.2    88   13.0 
2025-09-26 00:00 UT   18 21 17.8   -31 11 32     3.014    3.205   91.8   18.2    88   13.0 
2025-09-27 00:00 UT   18 22 00.2   -31 10 06     3.029    3.206   90.9   18.2    88   13.0 
2025-09-28 00:00 UT   18 22 43.6   -31 08 39     3.044    3.207   90.1   18.2    88   13.0 
2025-09-29 00:00 UT   18 23 28.1   -31 07 11     3.059    3.207   89.3   18.2    88   13.0 
2025-09-30 00:00 UT   18 24 13.7   -31 05 43     3.074    3.208   88.5   18.2    88   13.0 
2025-10-01 00:00 UT   18 25 00.3   -31 04 13     3.089    3.208   87.7   18.2    88   13.1 
2025-10-02 00:00 UT   18 25 47.8   -31 02 43     3.104    3.209   86.9   18.1    88   13.1 
2025-10-03 00:00 UT   18 26 36.4   -31 01 11     3.118    3.210   86.1   18.1    88   13.1 
2025-10-04 00:00 UT   18 27 25.9   -30 59 39     3.133    3.210   85.3   18.1    88   13.1 
2025-10-05 00:00 UT   18 28 16.4   -30 58 06     3.148    3.211   84.5   18.1    88   13.1 
2025-10-06 00:00 UT   18 29 07.8   -30 56 31     3.163    3.211   83.7   18.0    88   13.1 
2025-10-07 00:00 UT   18 30 00.1   -30 54 56     3.178    3.212   82.9   18.0    88   13.1 
2025-10-08 00:00 UT   18 30 53.4   -30 53 19     3.193    3.212   82.1   17.9    88   13.1 
2025-10-09 00:00 UT   18 31 47.5   -30 51 42     3.208    3.213   81.4   17.9    88   13.1 
2025-10-10 00:00 UT   18 32 42.5   -30 50 03     3.222    3.214   80.6   17.9    88   13.1 
2025-10-11 00:00 UT   18 33 38.4   -30 48 23     3.237    3.214   79.8   17.8    88   13.1 
2025-10-12 00:00 UT   18 34 35.1   -30 46 42     3.252    3.215   79.0   17.7    88   13.2 
2025-10-13 00:00 UT   18 35 32.7   -30 44 59     3.266    3.215   78.2   17.7    88   13.2 
2025-10-14 00:00 UT   18 36 31.1   -30 43 15     3.281    3.216   77.5   17.6    88   13.2 
2025-10-15 00:00 UT   18 37 30.3   -30 41 30     3.296    3.216   76.7   17.6    88   13.2 
2025-10-16 00:00 UT   18 38 30.3   -30 39 44     3.310    3.217   75.9   17.5    88   13.2 
2025-10-17 00:00 UT   18 39 31.1   -30 37 56     3.325    3.217   75.2   17.4    88   13.2 

    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.