(397) Vienna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	12 Jul 2025	15.0	3.091 AU	2.825 AU	13h31m	-10°33'	95.4°	19.1°
Opposition	4 Aug 2026	12.1	2.172 AU	1.204 AU	20h31m	+05°28'	156.4°	10.8°

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 Vienna are:

            e (Eccentricity)                : 0.2474670
            a (Semimajor axis)              : 2.6348333
            i (Inclination)                 : 12.86931
            Ω (Longitude of ascending node) : 227.88419
            ω (Argument of perihelion)      : 139.95249
            M (Mean anomaly)                : 220.04356
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 188.55298
            B (Latitude of perihelion)      : 8.23932
            P (Orbital period in years)     : 4.28            
        

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
2025-07-12 00:00 UT   13 31 07.5   -10 33 06     2.825    3.091   95.4   19.1   111   15.0 
2025-07-12 09:32 UT   13 31 20.1   -10 33 12     2.830    3.091   95.1   19.1   111   15.0 
2025-07-13 00:00 UT   13 31 39.5   -10 33 22     2.838    3.090   94.6   19.1   111   15.0 
2025-07-14 00:00 UT   13 32 12.5   -10 33 45     2.850    3.088   93.7   19.2   111   15.1 
2025-07-15 00:00 UT   13 32 46.5   -10 34 14     2.863    3.086   92.9   19.2   111   15.1 
2025-07-16 00:00 UT   13 33 21.4   -10 34 51     2.875    3.085   92.1   19.2   111   15.1 
2025-07-17 00:00 UT   13 33 57.2   -10 35 33     2.888    3.083   91.3   19.2   111   15.1 
2025-07-18 00:00 UT   13 34 34.0   -10 36 23     2.900    3.081   90.5   19.3   111   15.1 
2025-07-19 00:00 UT   13 35 11.7   -10 37 19     2.913    3.080   89.7   19.3   111   15.1 
2025-07-20 00:00 UT   13 35 50.3   -10 38 21     2.926    3.078   88.9   19.3   111   15.1 
2025-07-21 00:00 UT   13 36 29.8   -10 39 29     2.938    3.077   88.1   19.3   111   15.1 
2025-07-22 00:00 UT   13 37 10.2   -10 40 44     2.951    3.075   87.3   19.3   111   15.1 
2025-07-23 00:00 UT   13 37 51.5   -10 42 04     2.963    3.073   86.5   19.3   111   15.1 
2025-07-24 00:00 UT   13 38 33.7   -10 43 31     2.976    3.072   85.7   19.3   111   15.1 
2025-07-25 00:00 UT   13 39 16.7   -10 45 03     2.988    3.070   84.9   19.2   111   15.1 
2025-07-26 00:00 UT   13 40 00.6   -10 46 42     3.001    3.068   84.2   19.2   111   15.2 
2025-07-27 00:00 UT   13 40 45.4   -10 48 26     3.013    3.067   83.4   19.2   111   15.2 
2025-07-28 00:00 UT   13 41 30.9   -10 50 15     3.025    3.065   82.6   19.2   111   15.2 
2025-07-29 00:00 UT   13 42 17.3   -10 52 10     3.038    3.063   81.8   19.2   111   15.2 
2025-07-30 00:00 UT   13 43 04.5   -10 54 10     3.050    3.061   81.1   19.1   111   15.2 
2025-07-31 00:00 UT   13 43 52.5   -10 56 15     3.062    3.060   80.3   19.1   111   15.2 
2025-08-01 00:00 UT   13 44 41.3   -10 58 25     3.074    3.058   79.6   19.1   111   15.2 
2025-08-02 00:00 UT   13 45 30.9   -11 00 41     3.087    3.056   78.8   19.0   111   15.2 
2025-08-03 00:00 UT   13 46 21.2   -11 03 01     3.099    3.055   78.1   19.0   111   15.2 
2025-08-04 00:00 UT   13 47 12.3   -11 05 26     3.111    3.053   77.3   18.9   111   15.2 
2025-08-05 00:00 UT   13 48 04.2   -11 07 55     3.123    3.051   76.6   18.9   111   15.2 
2025-08-06 00:00 UT   13 48 56.8   -11 10 30     3.135    3.049   75.8   18.8   111   15.2 
2025-08-07 00:00 UT   13 49 50.1   -11 13 08     3.147    3.048   75.1   18.8   111   15.2 
2025-08-08 00:00 UT   13 50 44.1   -11 15 51     3.159    3.046   74.3   18.7   111   15.2 
2025-08-09 00:00 UT   13 51 38.9   -11 18 38     3.170    3.044   73.6   18.6   111   15.2 
2025-08-10 00:00 UT   13 52 34.3   -11 21 29     3.182    3.042   72.9   18.6   110   15.2 
2025-08-11 00:00 UT   13 53 30.5   -11 24 25     3.194    3.040   72.2   18.5   110   15.2 

    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.