(116) Sirona
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	17 Sep 2026	13.4	2.759 AU	3.090 AU	15h31m	-19°41'	61.7°	18.7°
Opposition	7 Aug 2027	12.0	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)                : 0.1380741
            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
2026-09-17 00:00 UT   15 31 49.3   -19 41 03     3.090    2.759   61.7   18.7   104   13.4 
2026-09-17 20:45 UT   15 33 02.5   -19 45 48     3.101    2.760   61.1   18.6   104   13.4 
2026-09-18 00:00 UT   15 33 14.0   -19 46 32     3.103    2.760   61.0   18.6   104   13.4 
2026-09-19 00:00 UT   15 34 39.2   -19 51 60     3.116    2.762   60.4   18.4   104   13.4 
2026-09-20 00:00 UT   15 36 04.9   -19 57 26     3.129    2.763   59.8   18.3   104   13.4 
2026-09-21 00:00 UT   15 37 31.1   -20 02 51     3.142    2.765   59.2   18.2   104   13.4 
2026-09-22 00:00 UT   15 38 57.8   -20 08 14     3.154    2.766   58.5   18.0   104   13.4 
2026-09-23 00:00 UT   15 40 24.9   -20 13 36     3.167    2.768   57.9   17.9   104   13.4 
2026-09-24 00:00 UT   15 41 52.5   -20 18 56     3.179    2.769   57.3   17.7   103   13.4 
2026-09-25 00:00 UT   15 43 20.6   -20 24 14     3.192    2.770   56.7   17.6   103   13.4 
2026-09-26 00:00 UT   15 44 49.1   -20 29 31     3.204    2.772   56.0   17.5   103   13.4 
2026-09-27 00:00 UT   15 46 18.1   -20 34 45     3.217    2.773   55.4   17.3   103   13.4 
2026-09-28 00:00 UT   15 47 47.5   -20 39 58     3.229    2.775   54.8   17.2   103   13.4 
2026-09-29 00:00 UT   15 49 17.4   -20 45 09     3.241    2.776   54.2   17.0   103   13.4 
2026-09-30 00:00 UT   15 50 47.6   -20 50 18     3.253    2.777   53.6   16.9   103   13.4 
2026-10-01 00:00 UT   15 52 18.3   -20 55 25     3.265    2.779   52.9   16.7   103   13.4 
2026-10-02 00:00 UT   15 53 49.5   -21 00 29     3.277    2.780   52.3   16.6   103   13.4 
2026-10-03 00:00 UT   15 55 21.0   -21 05 32     3.289    2.782   51.7   16.4   102   13.4 
2026-10-04 00:00 UT   15 56 53.0   -21 10 32     3.301    2.783   51.1   16.2   102   13.5 
2026-10-05 00:00 UT   15 58 25.4   -21 15 30     3.312    2.785   50.5   16.1   102   13.5 
2026-10-06 00:00 UT   15 59 58.2   -21 20 25     3.324    2.786   49.8   15.9   102   13.5 
2026-10-07 00:00 UT   16 01 31.4   -21 25 18     3.335    2.787   49.2   15.8   102   13.5 
2026-10-08 00:00 UT   16 03 05.0   -21 30 09     3.347    2.789   48.6   15.6   102   13.5 
2026-10-09 00:00 UT   16 04 39.0   -21 34 57     3.358    2.790   48.0   15.4   102   13.5 
2026-10-10 00:00 UT   16 06 13.3   -21 39 43     3.369    2.792   47.4   15.3   102   13.5 

    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.