(116) Sirona
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	3 May 2026	10.9	2.567 AU	1.559 AU	14h44m	-13°44'	177.9°	0.8°
Today	13 May 2026	11.2	2.580 AU	1.581 AU	14h36m	-13°20'	168.9°	4.3°

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 Sirona are:

            e (Eccentricity)                : 0.1380527
            a (Semimajor axis)              : 2.7683960
            i (Inclination)                 : 3.56136
            Ω (Longitude of ascending node) : 63.67472
            ω (Argument of perihelion)      : 93.95979
            M (Mean anomaly)                : 16.48865
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : -22.35785
            B (Latitude of perihelion)      : 3.55285
            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
2026-05-13 00:00 UT   14 36 18.9   -13 20 55     1.581    2.580  168.9    4.3   117   11.2 
2026-05-13 18:19 UT   14 35 40.4   -13 19 09     1.584    2.581  168.0    4.7   117   11.2 
2026-05-14 00:00 UT   14 35 28.5   -13 18 37     1.584    2.581  167.7    4.8   116   11.2 
2026-05-15 00:00 UT   14 34 38.9   -13 16 23     1.588    2.582  166.6    5.2   116   11.3 
2026-05-16 00:00 UT   14 33 50.1   -13 14 12     1.593    2.584  165.4    5.7   115   11.3 
2026-05-17 00:00 UT   14 33 02.0   -13 12 05     1.597    2.585  164.3    6.1   114   11.3 
2026-05-18 00:00 UT   14 32 14.9   -13 10 02     1.602    2.586  163.1    6.5   114   11.4 
2026-05-19 00:00 UT   14 31 28.7   -13 08 04     1.607    2.588  162.0    7.0   113   11.4 
2026-05-20 00:00 UT   14 30 43.4   -13 06 10     1.612    2.589  160.8    7.4   113   11.4 
2026-05-21 00:00 UT   14 29 59.3   -13 04 21     1.617    2.590  159.7    7.8   113   11.4 
2026-05-22 00:00 UT   14 29 16.2   -13 02 37     1.623    2.592  158.6    8.2   113   11.5 
2026-05-23 00:00 UT   14 28 34.2   -13 00 58     1.629    2.593  157.4    8.6   112   11.5 
2026-05-24 00:00 UT   14 27 53.4   -12 59 25     1.635    2.594  156.3    9.0   112   11.5 
2026-05-25 00:00 UT   14 27 13.8   -12 57 57     1.641    2.596  155.2    9.4   112   11.6 
2026-05-26 00:00 UT   14 26 35.4   -12 56 35     1.648    2.597  154.1    9.8   112   11.6 
2026-05-27 00:00 UT   14 25 58.3   -12 55 18     1.655    2.598  153.0   10.2   111   11.6 
2026-05-28 00:00 UT   14 25 22.5   -12 54 08     1.662    2.600  151.9   10.6   111   11.6 
2026-05-29 00:00 UT   14 24 48.0   -12 53 03     1.669    2.601  150.8   11.0   111   11.7 
2026-05-30 00:00 UT   14 24 14.8   -12 52 05     1.677    2.602  149.7   11.3   111   11.7 
2026-05-31 00:00 UT   14 23 43.1   -12 51 13     1.684    2.604  148.6   11.7   111   11.7 
2026-06-01 00:00 UT   14 23 12.7   -12 50 28     1.692    2.605  147.5   12.1   111   11.7 
2026-06-02 00:00 UT   14 22 43.7   -12 49 49     1.700    2.607  146.5   12.4   111   11.8 
2026-06-03 00:00 UT   14 22 16.1   -12 49 16     1.709    2.608  145.4   12.8   111   11.8 
2026-06-04 00:00 UT   14 21 50.0   -12 48 50     1.717    2.609  144.3   13.1   111   11.8 
2026-06-05 00:00 UT   14 21 25.4   -12 48 31     1.726    2.611  143.3   13.4   111   11.8 
2026-06-06 00:00 UT   14 21 02.2   -12 48 18     1.735    2.612  142.2   13.8   110   11.9 
2026-06-07 00:00 UT   14 20 40.5   -12 48 12     1.744    2.613  141.2   14.1   110   11.9 
2026-06-08 00:00 UT   14 20 20.3   -12 48 14     1.753    2.615  140.2   14.4   110   11.9 
2026-06-09 00:00 UT   14 20 01.6   -12 48 22     1.763    2.616  139.1   14.7   110   11.9 
2026-06-10 00:00 UT   14 19 44.5   -12 48 37     1.773    2.618  138.1   15.0   110   11.9 
2026-06-11 00:00 UT   14 19 28.8   -12 48 59     1.782    2.619  137.1   15.3   110   12.0 
2026-06-12 00:00 UT   14 19 14.7   -12 49 27     1.792    2.620  136.1   15.6   110   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.