(397) Vienna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	23 Oct 2025	15.1	2.895 AU	3.776 AU	15h26m	-16°20'	24.0°	8.0°
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)                : 0.2473263
            a (Semimajor axis)              : 2.6351384
            i (Inclination)                 : 12.86808
            Ω (Longitude of ascending node) : 227.88372
            ω (Argument of perihelion)      : 139.93528
            M (Mean anomaly)                : 266.13915
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 188.53525
            B (Latitude of perihelion)      : 8.24151
            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.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-10-23 00:00 UT   15 26 31.1   -16 20 60     3.776    2.895   24.0    8.0    99   15.1 
2025-10-23 10:41 UT   15 27 12.2   -16 22 46     3.777    2.894   23.8    8.0    99   15.1 
2025-10-24 00:00 UT   15 28 03.5   -16 24 58     3.779    2.893   23.4    7.9    99   15.1 
2025-10-25 00:00 UT   15 29 36.3   -16 28 54     3.782    2.891   22.8    7.7    98   15.1 
2025-10-26 00:00 UT   15 31 09.4   -16 32 47     3.785    2.889   22.2    7.5    98   15.1 
2025-10-27 00:00 UT   15 32 42.8   -16 36 39     3.788    2.887   21.6    7.3    98   15.1 
2025-10-28 00:00 UT   15 34 16.5   -16 40 28     3.790    2.884   21.0    7.1    97   15.1 
2025-10-29 00:00 UT   15 35 50.6   -16 44 16     3.793    2.882   20.4    6.9    97   15.1 
2025-10-30 00:00 UT   15 37 25.0   -16 48 00     3.795    2.880   19.7    6.7    96   15.0 
2025-10-31 00:00 UT   15 38 59.6   -16 51 43     3.797    2.878   19.1    6.5    96   15.0 
2025-11-01 00:00 UT   15 40 34.6   -16 55 23     3.799    2.875   18.5    6.3    95   15.0 
2025-11-02 00:00 UT   15 42 09.9   -16 59 00     3.801    2.873   17.9    6.1    95   15.0 
2025-11-03 00:00 UT   15 43 45.5   -17 02 35     3.803    2.871   17.3    5.9    94   15.0 
2025-11-04 00:00 UT   15 45 21.4   -17 06 07     3.805    2.869   16.7    5.7    94   15.0 
2025-11-05 00:00 UT   15 46 57.6   -17 09 37     3.806    2.867   16.1    5.5    93   15.0 
2025-11-06 00:00 UT   15 48 34.0   -17 13 03     3.807    2.864   15.5    5.3    93   15.0 
2025-11-07 00:00 UT   15 50 10.8   -17 16 27     3.808    2.862   14.9    5.1    92   15.0 
2025-11-08 00:00 UT   15 51 47.8   -17 19 48     3.809    2.860   14.3    4.9    91   15.0 
2025-11-09 00:00 UT   15 53 25.1   -17 23 06     3.810    2.857   13.7    4.7    90   14.9 
2025-11-10 00:00 UT   15 55 02.8   -17 26 22     3.811    2.855   13.1    4.5    90   14.9 
2025-11-11 00:00 UT   15 56 40.6   -17 29 34     3.811    2.853   12.5    4.3    89   14.9 
2025-11-12 00:00 UT   15 58 18.8   -17 32 43     3.812    2.851   11.9    4.1    88   14.9 
2025-11-13 00:00 UT   15 59 57.2   -17 35 49     3.812    2.848   11.4    3.9    87   14.9 
2025-11-14 00:00 UT   16 01 35.9   -17 38 51     3.812    2.846   10.8    3.7    86   14.9 

    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.