(17) Thetis
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	8 Apr 2023	10.6	2.290 AU	1.297 AU	13h21m	+01°35'	170.5°	4.1°
Today	7 Jun 2023	11.7	2.220 AU	1.579 AU	12h56m	+02°31'	116.0°	24.3°

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)                : 0.1325702
            a (Semimajor axis)              : 2.4712928
            i (Inclination)                 : 5.59200
            Ω (Longitude of ascending node) : 125.53989
            ω (Argument of perihelion)      : 135.72412
            M (Mean anomaly)                : 299.13961
            Epoch                           : 2023 Feb 25

            L (Longitude of perihelion)     : 81.40062
            B (Latitude of perihelion)      : 3.90067
            P (Orbital period in years)     : 3.88            
        

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
2023-06-07 00:00 UT   12 56 09.9   +02 31 46     1.579    2.220  116.0   24.3   117   11.7 
2023-06-07 21:52 UT   12 56 28.0   +02 26 54     1.588    2.219  115.2   24.4   117   11.7 
2023-06-08 00:00 UT   12 56 29.9   +02 26 25     1.589    2.219  115.1   24.5   117   11.7 
2023-06-09 00:00 UT   12 56 51.4   +02 20 53     1.598    2.218  114.3   24.7   116   11.7 
2023-06-10 00:00 UT   12 57 14.4   +02 15 12     1.607    2.217  113.5   24.8   116   11.7 
2023-06-11 00:00 UT   12 57 39.0   +02 09 22     1.616    2.216  112.7   25.0   116   11.8 
2023-06-12 00:00 UT   12 58 05.1   +02 03 22     1.626    2.215  111.9   25.2   116   11.8 
2023-06-13 00:00 UT   12 58 32.7   +01 57 13     1.635    2.214  111.1   25.3   116   11.8 
2023-06-14 00:00 UT   12 59 01.8   +01 50 55     1.645    2.213  110.3   25.5   116   11.8 
2023-06-15 00:00 UT   12 59 32.4   +01 44 28     1.655    2.212  109.5   25.7   115   11.8 
2023-06-16 00:00 UT   13 00 04.5   +01 37 52     1.664    2.211  108.7   25.8   115   11.8 
2023-06-17 00:00 UT   13 00 38.0   +01 31 08     1.674    2.210  107.9   25.9   115   11.9 
2023-06-18 00:00 UT   13 01 13.0   +01 24 16     1.684    2.209  107.2   26.1   115   11.9 
2023-06-19 00:00 UT   13 01 49.4   +01 17 16     1.694    2.208  106.4   26.2   115   11.9 
2023-06-20 00:00 UT   13 02 27.1   +01 10 08     1.704    2.207  105.7   26.3   115   11.9 
2023-06-21 00:00 UT   13 03 06.3   +01 02 52     1.714    2.206  104.9   26.4   115   11.9 
2023-06-22 00:00 UT   13 03 46.9   +00 55 29     1.724    2.205  104.2   26.5   114   11.9 
2023-06-23 00:00 UT   13 04 28.7   +00 47 58     1.734    2.204  103.4   26.6   114   11.9 
2023-06-24 00:00 UT   13 05 12.0   +00 40 20     1.744    2.203  102.7   26.7   114   12.0 
2023-06-25 00:00 UT   13 05 56.5   +00 32 36     1.754    2.202  102.0   26.8   114   12.0 
2023-06-26 00:00 UT   13 06 42.3   +00 24 44     1.764    2.201  101.3   26.9   114   12.0 
2023-06-27 00:00 UT   13 07 29.4   +00 16 46     1.774    2.200  100.6   27.0   114   12.0 
2023-06-28 00:00 UT   13 08 17.7   +00 08 41     1.784    2.199   99.8   27.1   114   12.0 
2023-06-29 00:00 UT   13 09 07.3   +00 00 31     1.794    2.198   99.1   27.2   114   12.0 
2023-06-30 00:00 UT   13 09 58.1   +00 07 46     1.805    2.198   98.4   27.2   113   12.0 
2023-07-01 00:00 UT   13 10 50.1   +00 16 09     1.815    2.197   97.8   27.3   113   12.1 
2023-07-02 00:00 UT   13 11 43.2   +00 24 37     1.825    2.196   97.1   27.4   113   12.1 
2023-07-03 00:00 UT   13 12 37.5   +00 33 11     1.835    2.195   96.4   27.4   113   12.1 
2023-07-04 00:00 UT   13 13 33.0   +00 41 51     1.846    2.194   95.7   27.5   113   12.1 
2023-07-05 00:00 UT   13 14 29.6   +00 50 35     1.856    2.193   95.0   27.5   113   12.1 
2023-07-06 00:00 UT   13 15 27.3   +00 59 25     1.866    2.192   94.4   27.5   113   12.1 
2023-07-07 00:00 UT   13 16 26.1   -01 08 19     1.877    2.191   93.7   27.6   113   12.1 

    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.