(23) Thalia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	9 Sep 2026	11.5	3.036 AU	2.051 AU	23h37m	-18°35'	165.2°	4.9°
Today	20 Sep 2026	11.5	3.019 AU	2.051 AU	23h28m	-19°24'	161.3°	6.1°

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)                : 0.2313135
            a (Semimajor axis)              : 2.6286617
            i (Inclination)                 : 10.10773
            Ω (Longitude of ascending node) : 66.47956
            ω (Argument of perihelion)      : 61.67082
            M (Mean anomaly)                : 216.40252
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 127.77442
            B (Latitude of perihelion)      : 8.88670
            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.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-09-20 00:00 UT   23 28 00.3   -19 24 09     2.051    3.019  161.3    6.1    16   11.5 
2026-09-20 00:31 UT   23 27 59.2   -19 24 14     2.051    3.019  161.3    6.1    16   11.5 
2026-09-21 00:00 UT   23 27 06.6   -19 27 54     2.052    3.017  160.5    6.4    19   11.5 
2026-09-22 00:00 UT   23 26 13.1   -19 31 28     2.054    3.016  159.7    6.6    21   11.5 
2026-09-23 00:00 UT   23 25 19.9   -19 34 51     2.056    3.014  158.9    6.9    24   11.5 
2026-09-24 00:00 UT   23 24 27.1   -19 38 04     2.058    3.012  158.1    7.1    26   11.6 
2026-09-25 00:00 UT   23 23 34.8   -19 41 05     2.061    3.011  157.2    7.4    28   11.6 
2026-09-26 00:00 UT   23 22 42.9   -19 43 56     2.064    3.009  156.3    7.7    30   11.6 
2026-09-27 00:00 UT   23 21 51.5   -19 46 36     2.067    3.007  155.4    8.0    32   11.6 
2026-09-28 00:00 UT   23 21 00.7   -19 49 04     2.070    3.006  154.4    8.3    34   11.6 
2026-09-29 00:00 UT   23 20 10.6   -19 51 21     2.074    3.004  153.5    8.6    35   11.6 
2026-09-30 00:00 UT   23 19 21.1   -19 53 26     2.078    3.002  152.5    8.9    37   11.6 
2026-10-01 00:00 UT   23 18 32.3   -19 55 19     2.082    3.001  151.5    9.1    38   11.7 
2026-10-02 00:00 UT   23 17 44.3   -19 57 01     2.087    2.999  150.6    9.4    40   11.7 
2026-10-03 00:00 UT   23 16 57.0   -19 58 32     2.091    2.997  149.6    9.7    41   11.7 
2026-10-04 00:00 UT   23 16 10.7   -19 59 50     2.096    2.996  148.6   10.0    42   11.7 
2026-10-05 00:00 UT   23 15 25.2   -20 00 56     2.101    2.994  147.5   10.3    43   11.7 
2026-10-06 00:00 UT   23 14 40.7   -20 01 51     2.107    2.992  146.5   10.6    44   11.7 
2026-10-07 00:00 UT   23 13 57.1   -20 02 34     2.112    2.990  145.5   10.9    45   11.8 
2026-10-08 00:00 UT   23 13 14.6   -20 03 04     2.118    2.989  144.5   11.2    46   11.8 
2026-10-09 00:00 UT   23 12 33.1   -20 03 23     2.124    2.987  143.5   11.5    47   11.8 
2026-10-10 00:00 UT   23 11 52.7   -20 03 30     2.131    2.985  142.4   11.8    48   11.8 
2026-10-11 00:00 UT   23 11 13.5   -20 03 25     2.137    2.983  141.4   12.0    49   11.8 
2026-10-12 00:00 UT   23 10 35.4   -20 03 08     2.144    2.982  140.4   12.3    49   11.8 
2026-10-13 00:00 UT   23 09 58.5   -20 02 39     2.151    2.980  139.4   12.6    50   11.9 
2026-10-14 00:00 UT   23 09 22.8   -20 01 58     2.158    2.978  138.3   12.9    51   11.9 
2026-10-15 00:00 UT   23 08 48.4   -20 01 06     2.165    2.976  137.3   13.1    52   11.9 
2026-10-16 00:00 UT   23 08 15.3   -20 00 02     2.173    2.975  136.3   13.4    52   11.9 
2026-10-17 00:00 UT   23 07 43.5   -19 58 47     2.181    2.973  135.3   13.7    53   11.9 
2026-10-18 00:00 UT   23 07 12.9   -19 57 20     2.189    2.971  134.2   13.9    53   11.9 
2026-10-19 00:00 UT   23 06 43.8   -19 55 42     2.197    2.969  133.2   14.2    54   11.9 
2026-10-20 00:00 UT   23 06 15.9   -19 53 53     2.205    2.967  132.2   14.4    54   12.0 

    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.