(17) Thetis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	14 Nov 2025	12.7	2.793 AU	2.112 AU	07h11m	+18°05'	124.4°	17.0°
Opposition	30 Dec 2025	11.6	2.778 AU	1.796 AU	06h40m	+19°15'	176.1°	1.4°

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 Thetis are:

            e (Eccentricity)                : 0.1312584
            a (Semimajor axis)              : 2.4728226
            i (Inclination)                 : 5.59392
            Ω (Longitude of ascending node) : 125.50275
            ω (Argument of perihelion)      : 135.94951
            M (Mean anomaly)                : 192.66164
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 81.58893
            B (Latitude of perihelion)      : 3.88621
            P (Orbital period in years)     : 3.89            
        

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
2025-11-14 00:00 UT   07 11 34.8   +18 05 06     2.112    2.793  124.4   17.0   280   12.7 
2025-11-14 12:18 UT   07 11 31.7   +18 05 06     2.106    2.793  124.9   16.9   280   12.7 
2025-11-15 00:00 UT   07 11 28.3   +18 05 08     2.101    2.793  125.4   16.8   280   12.6 
2025-11-16 00:00 UT   07 11 20.1   +18 05 15     2.089    2.792  126.4   16.6   280   12.6 
2025-11-17 00:00 UT   07 11 10.3   +18 05 25     2.078    2.792  127.5   16.3   280   12.6 
2025-11-18 00:00 UT   07 10 58.7   +18 05 40     2.067    2.792  128.5   16.1   280   12.6 
2025-11-19 00:00 UT   07 10 45.5   +18 05 59     2.056    2.792  129.6   15.8   281   12.6 
2025-11-20 00:00 UT   07 10 30.5   +18 06 23     2.045    2.791  130.6   15.6   281   12.5 
2025-11-21 00:00 UT   07 10 13.8   +18 06 50     2.035    2.791  131.7   15.3   281   12.5 
2025-11-22 00:00 UT   07 09 55.5   +18 07 22     2.024    2.791  132.8   15.1   281   12.5 
2025-11-23 00:00 UT   07 09 35.4   +18 07 59     2.014    2.791  133.9   14.8   281   12.5 
2025-11-24 00:00 UT   07 09 13.7   +18 08 39     2.004    2.790  135.0   14.5   281   12.5 
2025-11-25 00:00 UT   07 08 50.2   +18 09 25     1.994    2.790  136.1   14.2   281   12.4 
2025-11-26 00:00 UT   07 08 25.1   +18 10 14     1.984    2.790  137.2   13.9   281   12.4 
2025-11-27 00:00 UT   07 07 58.4   +18 11 08     1.975    2.790  138.3   13.6   282   12.4 
2025-11-28 00:00 UT   07 07 29.9   +18 12 06     1.965    2.789  139.4   13.3   282   12.4 
2025-11-29 00:00 UT   07 06 59.9   +18 13 09     1.956    2.789  140.5   13.0   282   12.4 
2025-11-30 00:00 UT   07 06 28.2   +18 14 15     1.947    2.789  141.7   12.7   282   12.3 
2025-12-01 00:00 UT   07 05 54.9   +18 15 26     1.939    2.789  142.8   12.3   282   12.3 
2025-12-02 00:00 UT   07 05 20.1   +18 16 41     1.930    2.788  143.9   12.0   282   12.3 
2025-12-03 00:00 UT   07 04 43.7   +18 18 01     1.922    2.788  145.1   11.7   283   12.3 
2025-12-04 00:00 UT   07 04 05.7   +18 19 24     1.914    2.788  146.2   11.3   283   12.2 
2025-12-05 00:00 UT   07 03 26.2   +18 20 51     1.906    2.787  147.4   11.0   283   12.2 
2025-12-06 00:00 UT   07 02 45.3   +18 22 23     1.898    2.787  148.6   10.6   283   12.2 
2025-12-07 00:00 UT   07 02 02.9   +18 23 58     1.891    2.787  149.8   10.3   283   12.2 
2025-12-08 00:00 UT   07 01 19.0   +18 25 37     1.884    2.786  150.9    9.9   284   12.2 
2025-12-09 00:00 UT   07 00 33.7   +18 27 20     1.877    2.786  152.1    9.5   284   12.1 
2025-12-10 00:00 UT   06 59 47.1   +18 29 06     1.870    2.786  153.3    9.1   284   12.1 
2025-12-11 00:00 UT   06 58 59.1   +18 30 56     1.864    2.785  154.5    8.8   285   12.1 
2025-12-12 00:00 UT   06 58 09.8   +18 32 50     1.858    2.785  155.7    8.4   285   12.1 
2025-12-13 00:00 UT   06 57 19.3   +18 34 47     1.852    2.785  156.9    8.0   286   12.0 
2025-12-14 00:00 UT   06 56 27.6   +18 36 47     1.847    2.784  158.1    7.6   286   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.