(116) Sirona
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	19 Dec 2024	11.1	2.592 AU	1.609 AU	05h50m	+25°46'	177.6°	0.9°
Today	5 Feb 2025	12.1	2.531 AU	1.836 AU	05h19m	+25°59'	124.7°	18.7°

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)                : 0.1389690
            a (Semimajor axis)              : 2.7711281
            i (Inclination)                 : 3.56266
            Ω (Longitude of ascending node) : 63.69162
            ω (Argument of perihelion)      : 93.78158
            M (Mean anomaly)                : 291.14568
            Epoch                           : 2024 Oct 17

            L (Longitude of perihelion)     : -22.51950
            B (Latitude of perihelion)      : 3.55489
            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
2025-02-05 00:00 UT   05 19 19.0   +25 59 49     1.836    2.531  124.7   18.7    88   12.1 
2025-02-05 12:03 UT   05 19 19.8   +25 59 52     1.841    2.530  124.2   18.8    88   12.1 
2025-02-06 00:00 UT   05 19 21.0   +25 59 55     1.845    2.529  123.7   18.9    88   12.1 
2025-02-07 00:00 UT   05 19 25.0   +26 00 02     1.855    2.528  122.7   19.2    88   12.1 
2025-02-08 00:00 UT   05 19 30.9   +26 00 10     1.865    2.527  121.7   19.4    88   12.2 
2025-02-09 00:00 UT   05 19 38.8   +26 00 19     1.875    2.526  120.8   19.6    88   12.2 
2025-02-10 00:00 UT   05 19 48.5   +26 00 29     1.885    2.525  119.8   19.8    88   12.2 
2025-02-11 00:00 UT   05 20 00.1   +26 00 40     1.895    2.523  118.8   20.0    88   12.2 
2025-02-12 00:00 UT   05 20 13.6   +26 00 51     1.905    2.522  117.9   20.2    88   12.2 
2025-02-13 00:00 UT   05 20 29.0   +26 01 04     1.915    2.521  116.9   20.4    88   12.2 
2025-02-14 00:00 UT   05 20 46.2   +26 01 18     1.926    2.520  116.0   20.6    88   12.3 
2025-02-15 00:00 UT   05 21 05.2   +26 01 32     1.936    2.519  115.0   20.8    87   12.3 
2025-02-16 00:00 UT   05 21 26.1   +26 01 47     1.947    2.517  114.1   21.0    87   12.3 
2025-02-17 00:00 UT   05 21 48.7   +26 02 03     1.958    2.516  113.2   21.2    87   12.3 
2025-02-18 00:00 UT   05 22 13.1   +26 02 20     1.969    2.515  112.3   21.3    87   12.3 
2025-02-19 00:00 UT   05 22 39.3   +26 02 38     1.979    2.514  111.3   21.5    87   12.3 
2025-02-20 00:00 UT   05 23 07.2   +26 02 56     1.990    2.513  110.4   21.6    87   12.4 
2025-02-21 00:00 UT   05 23 36.9   +26 03 16     2.001    2.511  109.5   21.8    87   12.4 
2025-02-22 00:00 UT   05 24 08.2   +26 03 35     2.012    2.510  108.7   21.9    87   12.4 
2025-02-23 00:00 UT   05 24 41.3   +26 03 56     2.023    2.509  107.8   22.1    87   12.4 
2025-02-24 00:00 UT   05 25 16.0   +26 04 16     2.035    2.508  106.9   22.2    87   12.4 
2025-02-25 00:00 UT   05 25 52.4   +26 04 38     2.046    2.507  106.0   22.3    87   12.4 
2025-02-26 00:00 UT   05 26 30.4   +26 04 59     2.057    2.506  105.2   22.4    87   12.4 
2025-02-27 00:00 UT   05 27 10.0   +26 05 21     2.069    2.505  104.3   22.5    87   12.5 
2025-02-28 00:00 UT   05 27 51.2   +26 05 44     2.080    2.503  103.5   22.6    87   12.5 
2025-03-01 00:00 UT   05 28 34.0   +26 06 06     2.091    2.502  102.6   22.7    88   12.5 
2025-03-02 00:00 UT   05 29 18.4   +26 06 29     2.103    2.501  101.8   22.8    88   12.5 
2025-03-03 00:00 UT   05 30 04.3   +26 06 52     2.114    2.500  101.0   22.9    88   12.5 
2025-03-04 00:00 UT   05 30 51.7   +26 07 14     2.126    2.499  100.1   23.0    88   12.5 
2025-03-05 00:00 UT   05 31 40.7   +26 07 37     2.137    2.498   99.3   23.1    88   12.5 
2025-03-06 00:00 UT   05 32 31.0   +26 07 59     2.149    2.497   98.5   23.1    88   12.6 
2025-03-07 00:00 UT   05 33 22.8   +26 08 21     2.161    2.495   97.7   23.2    88   12.6 

    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.