(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	26 Dec 2024	11.2	2.584 AU	1.607 AU	05h43m	+25°52'	171.6°	3.2°

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)                : 291.14569
            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
2024-12-26 00:00 UT   05 43 30.8   +25 52 19     1.607    2.584  171.6    3.2   105   11.2 
2024-12-26 13:38 UT   05 42 56.0   +25 52 45     1.607    2.583  170.9    3.5   104   11.2 
2024-12-27 00:00 UT   05 42 29.6   +25 53 05     1.607    2.582  170.4    3.7   103   11.2 
2024-12-28 00:00 UT   05 41 28.9   +25 53 47     1.608    2.581  169.1    4.1   101   11.3 
2024-12-29 00:00 UT   05 40 28.8   +25 54 27     1.610    2.580  167.9    4.6   100   11.3 
2024-12-30 00:00 UT   05 39 29.3   +25 55 04     1.611    2.578  166.7    5.0    99   11.3 
2024-12-31 00:00 UT   05 38 30.6   +25 55 38     1.613    2.577  165.5    5.5    98   11.3 
2025-01-01 00:00 UT   05 37 32.6   +25 56 09     1.615    2.576  164.3    5.9    97   11.4 
2025-01-02 00:00 UT   05 36 35.6   +25 56 37     1.618    2.574  163.0    6.4    96   11.4 
2025-01-03 00:00 UT   05 35 39.6   +25 57 03     1.620    2.573  161.8    6.8    96   11.4 
2025-01-04 00:00 UT   05 34 44.6   +25 57 26     1.623    2.572  160.6    7.3    95   11.4 
2025-01-05 00:00 UT   05 33 50.7   +25 57 47     1.626    2.570  159.4    7.7    95   11.5 
2025-01-06 00:00 UT   05 32 58.0   +25 58 06     1.630    2.569  158.2    8.2    94   11.5 
2025-01-07 00:00 UT   05 32 06.5   +25 58 22     1.634    2.568  157.0    8.6    94   11.5 
2025-01-08 00:00 UT   05 31 16.3   +25 58 37     1.638    2.566  155.8    9.0    93   11.5 
2025-01-09 00:00 UT   05 30 27.5   +25 58 49     1.642    2.565  154.6    9.5    93   11.6 
2025-01-10 00:00 UT   05 29 40.2   +25 58 59     1.646    2.564  153.4    9.9    92   11.6 
2025-01-11 00:00 UT   05 28 54.2   +25 59 08     1.651    2.562  152.2   10.3    92   11.6 
2025-01-12 00:00 UT   05 28 09.8   +25 59 16     1.656    2.561  151.0   10.7    92   11.6 
2025-01-13 00:00 UT   05 27 27.0   +25 59 22     1.661    2.560  149.9   11.1    92   11.6 
2025-01-14 00:00 UT   05 26 45.7   +25 59 26     1.666    2.558  148.7   11.5    91   11.7 
2025-01-15 00:00 UT   05 26 06.1   +25 59 30     1.672    2.557  147.5   11.9    91   11.7 
2025-01-16 00:00 UT   05 25 28.1   +25 59 32     1.678    2.556  146.4   12.3    91   11.7 
2025-01-17 00:00 UT   05 24 51.9   +25 59 34     1.684    2.555  145.2   12.7    91   11.7 
2025-01-18 00:00 UT   05 24 17.4   +25 59 34     1.690    2.553  144.1   13.1    90   11.7 
2025-01-19 00:00 UT   05 23 44.7   +25 59 35     1.697    2.552  143.0   13.4    90   11.8 
2025-01-20 00:00 UT   05 23 13.7   +25 59 34     1.704    2.551  141.8   13.8    90   11.8 
2025-01-21 00:00 UT   05 22 44.6   +25 59 34     1.711    2.549  140.7   14.2    90   11.8 
2025-01-22 00:00 UT   05 22 17.4   +25 59 33     1.718    2.548  139.6   14.5    90   11.8 
2025-01-23 00:00 UT   05 21 52.0   +25 59 32     1.725    2.547  138.5   14.8    89   11.9 
2025-01-24 00:00 UT   05 21 28.5   +25 59 30     1.733    2.546  137.4   15.2    89   11.9 
2025-01-25 00:00 UT   05 21 06.9   +25 59 29     1.740    2.544  136.3   15.5    89   11.9 

    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.