(397) Vienna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	4 Aug 2026	12.1	2.172 AU	1.204 AU	20h31m	+05°27'	156.5°	10.8°
Today	16 Aug 2026	12.1	2.147 AU	1.195 AU	20h22m	+04°50'	153.0°	12.4°

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)                : 0.2472416
            a (Semimajor axis)              : 2.6353056
            i (Inclination)                 : 12.86691
            Ω (Longitude of ascending node) : 227.87896
            ω (Argument of perihelion)      : 139.91867
            M (Mean anomaly)                : 312.22971
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 188.51382
            B (Latitude of perihelion)      : 8.24363
            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
2026-08-16 00:00 UT   20 22 23.1   +04 50 52     1.195    2.147  153.0   12.4   134   12.1 
2026-08-16 14:00 UT   20 21 57.0   +04 48 05     1.195    2.146  152.7   12.5   133   12.1 
2026-08-17 00:00 UT   20 21 38.5   +04 46 02     1.196    2.145  152.5   12.6   132   12.1 
2026-08-18 00:00 UT   20 20 55.1   +04 40 59     1.196    2.143  151.9   12.9   130   12.2 
2026-08-19 00:00 UT   20 20 12.8   +04 35 42     1.197    2.141  151.3   13.1   128   12.2 
2026-08-20 00:00 UT   20 19 31.7   +04 30 13     1.199    2.139  150.6   13.4   126   12.2 
2026-08-21 00:00 UT   20 18 51.9   +04 24 31     1.200    2.137  150.0   13.7   124   12.2 
2026-08-22 00:00 UT   20 18 13.5   +04 18 38     1.201    2.135  149.3   14.0   122   12.2 
2026-08-23 00:00 UT   20 17 36.5   +04 12 34     1.203    2.133  148.6   14.3   121   12.2 
2026-08-24 00:00 UT   20 17 00.9   +04 06 19     1.205    2.131  147.9   14.6   119   12.2 
2026-08-25 00:00 UT   20 16 26.9   +03 59 54     1.207    2.128  147.2   14.9   117   12.2 
2026-08-26 00:00 UT   20 15 54.4   +03 53 20     1.210    2.126  146.4   15.2   116   12.2 
2026-08-27 00:00 UT   20 15 23.5   +03 46 37     1.212    2.124  145.7   15.6   114   12.3 
2026-08-28 00:00 UT   20 14 54.2   +03 39 45     1.215    2.122  144.9   15.9   113   12.3 
2026-08-29 00:00 UT   20 14 26.7   +03 32 45     1.218    2.120  144.1   16.2   112   12.3 
2026-08-30 00:00 UT   20 14 00.8   +03 25 38     1.221    2.118  143.3   16.5   110   12.3 
2026-08-31 00:00 UT   20 13 36.7   +03 18 24     1.224    2.116  142.5   16.9   109   12.3 
2026-09-01 00:00 UT   20 13 14.4   +03 11 03     1.228    2.114  141.7   17.2   108   12.3 
2026-09-02 00:00 UT   20 12 53.9   +03 03 37     1.231    2.113  140.9   17.5   107   12.3 
2026-09-03 00:00 UT   20 12 35.3   +02 56 05     1.235    2.111  140.1   17.9   106   12.4 
2026-09-04 00:00 UT   20 12 18.6   +02 48 29     1.239    2.109  139.3   18.2   105   12.4 
2026-09-05 00:00 UT   20 12 03.7   +02 40 48     1.243    2.107  138.5   18.5   104   12.4 
2026-09-06 00:00 UT   20 11 50.8   +02 33 03     1.247    2.105  137.6   18.8   103   12.4 
2026-09-07 00:00 UT   20 11 39.8   +02 25 15     1.252    2.103  136.8   19.2   102   12.4 
2026-09-08 00:00 UT   20 11 30.9   +02 17 25     1.256    2.101  136.0   19.5   101   12.4 
2026-09-09 00:00 UT   20 11 23.9   +02 09 32     1.261    2.099  135.1   19.8   100   12.5 
2026-09-10 00:00 UT   20 11 18.9   +02 01 37     1.266    2.097  134.3   20.1    99   12.5 
2026-09-11 00:00 UT   20 11 16.0   +01 53 41     1.271    2.095  133.5   20.4    98   12.5 
2026-09-12 00:00 UT   20 11 15.1   +01 45 45     1.276    2.094  132.7   20.7    98   12.5 
2026-09-13 00:00 UT   20 11 16.3   +01 37 48     1.282    2.092  131.8   21.0    97   12.5 
2026-09-14 00:00 UT   20 11 19.5   +01 29 52     1.287    2.090  131.0   21.3    96   12.5 
2026-09-15 00:00 UT   20 11 24.8   +01 21 57     1.293    2.088  130.2   21.6    95   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.