(116) Sirona
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	2 Oct 2025	12.8	2.389 AU	3.330 AU	11h35m	+05°23'	16.7°	6.9°
Opposition	3 May 2026	10.9	2.567 AU	1.559 AU	14h44m	-13°44'	177.9°	0.8°

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) : 63.67471
            ω (Argument of perihelion)      : 93.95980
            M (Mean anomaly)                : 16.48866
            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. 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
2025-10-02 00:00 UT   11 35 20.9   +05 23 17     3.330    2.389   16.7    6.9   302   12.8 
2025-10-02 20:25 UT   11 36 52.1   +05 13 31     3.327    2.389   17.1    7.1   301   12.8 
2025-10-03 00:00 UT   11 37 08.1   +05 11 48     3.327    2.389   17.2    7.1   301   12.8 
2025-10-04 00:00 UT   11 38 55.1   +05 00 19     3.323    2.389   17.7    7.3   301   12.8 
2025-10-05 00:00 UT   11 40 42.1   +04 48 50     3.319    2.389   18.2    7.5   301   12.8 
2025-10-06 00:00 UT   11 42 28.9   +04 37 21     3.315    2.390   18.7    7.7   301   12.8 
2025-10-07 00:00 UT   11 44 15.6   +04 25 53     3.311    2.390   19.2    7.9   301   12.8 
2025-10-08 00:00 UT   11 46 02.2   +04 14 24     3.307    2.390   19.7    8.1   300   12.8 
2025-10-09 00:00 UT   11 47 48.6   +04 02 56     3.303    2.390   20.2    8.3   300   12.8 
2025-10-10 00:00 UT   11 49 34.9   +03 51 28     3.299    2.391   20.7    8.5   300   12.8 
2025-10-11 00:00 UT   11 51 21.2   +03 40 01     3.295    2.391   21.2    8.7   300   12.9 
2025-10-12 00:00 UT   11 53 07.3   +03 28 33     3.290    2.391   21.7    8.9   300   12.9 
2025-10-13 00:00 UT   11 54 53.3   +03 17 07     3.286    2.391   22.2    9.1   300   12.9 
2025-10-14 00:00 UT   11 56 39.2   +03 05 41     3.281    2.392   22.7    9.3   299   12.9 
2025-10-15 00:00 UT   11 58 24.9   +02 54 15     3.276    2.392   23.2    9.4   299   12.9 
2025-10-16 00:00 UT   12 00 10.6   +02 42 51     3.271    2.392   23.7    9.6   299   12.9 
2025-10-17 00:00 UT   12 01 56.1   +02 31 27     3.266    2.393   24.2    9.8   299   12.9 
2025-10-18 00:00 UT   12 03 41.5   +02 20 04     3.261    2.393   24.7   10.0   299   12.9 
2025-10-19 00:00 UT   12 05 26.7   +02 08 41     3.256    2.393   25.2   10.2   299   12.9 

    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.