(116) Sirona
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	18 Aug 2026	13.1	2.716 AU	2.678 AU	14h53m	-16°52'	81.3°	21.6°
Opposition	7 Aug 2027	12.1	3.111 AU	2.099 AU	21h14m	-21°12'	175.0°	1.6°

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 Sirona are:

            e (Eccentricity)                : 0.1380740
            a (Semimajor axis)              : 2.7687062
            i (Inclination)                 : 3.56124
            Ω (Longitude of ascending node) : 63.67583
            ω (Argument of perihelion)      : 94.01518
            M (Mean anomaly)                : 59.23198
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : -22.30125
            B (Latitude of perihelion)      : 3.55249
            P (Orbital period in years)     : 4.61            
        

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
2026-08-18 00:00 UT   14 53 58.6   -16 52 43     2.678    2.716   81.3   21.6   107   13.1 
2026-08-18 17:48 UT   14 54 47.6   -16 56 49     2.688    2.717   80.8   21.6   107   13.1 
2026-08-19 00:00 UT   14 55 04.7   -16 58 15     2.692    2.717   80.6   21.6   107   13.1 
2026-08-20 00:00 UT   14 56 11.6   -17 03 49     2.706    2.719   79.9   21.5   107   13.2 
2026-08-21 00:00 UT   14 57 19.2   -17 09 23     2.720    2.720   79.3   21.4   107   13.2 
2026-08-22 00:00 UT   14 58 27.6   -17 14 59     2.734    2.722   78.6   21.4   107   13.2 
2026-08-23 00:00 UT   14 59 36.6   -17 20 35     2.749    2.723   77.9   21.3   106   13.2 
2026-08-24 00:00 UT   15 00 46.4   -17 26 12     2.763    2.724   77.3   21.2   106   13.2 
2026-08-25 00:00 UT   15 01 56.8   -17 31 50     2.777    2.726   76.6   21.1   106   13.2 
2026-08-26 00:00 UT   15 03 07.9   -17 37 28     2.791    2.727   75.9   21.1   106   13.2 
2026-08-27 00:00 UT   15 04 19.7   -17 43 06     2.805    2.729   75.3   21.0   106   13.2 
2026-08-28 00:00 UT   15 05 32.2   -17 48 45     2.819    2.730   74.6   20.9   106   13.2 
2026-08-29 00:00 UT   15 06 45.3   -17 54 25     2.833    2.732   73.9   20.8   106   13.2 
2026-08-30 00:00 UT   15 07 59.0   -18 00 04     2.847    2.733   73.3   20.7   106   13.2 
2026-08-31 00:00 UT   15 09 13.4   -18 05 44     2.861    2.735   72.6   20.6   106   13.3 
2026-09-01 00:00 UT   15 10 28.5   -18 11 23     2.875    2.736   72.0   20.5   106   13.3 
2026-09-02 00:00 UT   15 11 44.1   -18 17 03     2.889    2.737   71.3   20.4   106   13.3 
2026-09-03 00:00 UT   15 13 00.4   -18 22 42     2.902    2.739   70.7   20.3   106   13.3 
2026-09-04 00:00 UT   15 14 17.2   -18 28 21     2.916    2.740   70.0   20.2   105   13.3 
2026-09-05 00:00 UT   15 15 34.7   -18 34 01     2.930    2.742   69.4   20.1   105   13.3 
2026-09-06 00:00 UT   15 16 52.8   -18 39 39     2.943    2.743   68.7   20.0   105   13.3 
2026-09-07 00:00 UT   15 18 11.5   -18 45 18     2.957    2.745   68.1   19.9   105   13.3 
2026-09-08 00:00 UT   15 19 30.7   -18 50 56     2.971    2.746   67.4   19.8   105   13.3 
2026-09-09 00:00 UT   15 20 50.6   -18 56 33     2.984    2.747   66.8   19.7   105   13.3 
2026-09-10 00:00 UT   15 22 11.0   -19 02 10     2.998    2.749   66.1   19.6   105   13.3 
2026-09-11 00:00 UT   15 23 31.9   -19 07 46     3.011    2.750   65.5   19.5   105   13.3 
2026-09-12 00:00 UT   15 24 53.5   -19 13 21     3.024    2.752   64.9   19.3   105   13.3 
2026-09-13 00:00 UT   15 26 15.6   -19 18 55     3.038    2.753   64.2   19.2   105   13.4 
2026-09-14 00:00 UT   15 27 38.2   -19 24 29     3.051    2.755   63.6   19.1   104   13.4 

    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.