(397) Vienna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	17 Jun 2026	13.1	2.289 AU	1.539 AU	20h57m	+01°32'	126.1°	21.0°
Opposition	4 Aug 2026	12.1	2.172 AU	1.204 AU	20h31m	+05°27'	156.5°	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)                : 0.2472416
            a (Semimajor axis)              : 2.6353056
            i (Inclination)                 : 12.86691
            Ω (Longitude of ascending node) : 227.87897
            ω (Argument of perihelion)      : 139.91867
            M (Mean anomaly)                : 312.22970
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 188.51383
            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
2026-06-17 00:00 UT   20 57 12.0   +01 32 10     1.539    2.289  126.1   21.0   239   13.1 
2026-06-17 12:47 UT   20 57 13.3   +01 37 15     1.533    2.288  126.5   20.9   239   13.1 
2026-06-18 00:00 UT   20 57 14.0   +01 41 41     1.528    2.287  126.9   20.8   239   13.1 
2026-06-19 00:00 UT   20 57 14.4   +01 51 04     1.517    2.284  127.7   20.6   238   13.1 
2026-06-20 00:00 UT   20 57 13.2   +02 00 21     1.507    2.282  128.4   20.4   238   13.0 
2026-06-21 00:00 UT   20 57 10.5   +02 09 31     1.496    2.279  129.2   20.2   237   13.0 
2026-06-22 00:00 UT   20 57 06.1   +02 18 33     1.486    2.277  130.0   20.0   236   13.0 
2026-06-23 00:00 UT   20 57 00.0   +02 27 27     1.476    2.274  130.9   19.8   236   13.0 
2026-06-24 00:00 UT   20 56 52.4   +02 36 13     1.465    2.272  131.7   19.5   235   12.9 
2026-06-25 00:00 UT   20 56 43.2   +02 44 51     1.456    2.269  132.5   19.3   234   12.9 
2026-06-26 00:00 UT   20 56 32.4   +02 53 19     1.446    2.267  133.3   19.1   234   12.9 
2026-06-27 00:00 UT   20 56 20.0   +03 01 39     1.436    2.264  134.1   18.8   233   12.9 
2026-06-28 00:00 UT   20 56 06.0   +03 09 48     1.427    2.262  134.9   18.6   232   12.8 
2026-06-29 00:00 UT   20 55 50.4   +03 17 48     1.417    2.259  135.7   18.3   231   12.8 
2026-06-30 00:00 UT   20 55 33.2   +03 25 38     1.408    2.257  136.5   18.1   230   12.8 
2026-07-01 00:00 UT   20 55 14.4   +03 33 17     1.399    2.254  137.3   17.8   230   12.8 
2026-07-02 00:00 UT   20 54 54.1   +03 40 45     1.390    2.252  138.1   17.6   229   12.7 
2026-07-03 00:00 UT   20 54 32.1   +03 48 02     1.382    2.249  138.9   17.3   228   12.7 
2026-07-04 00:00 UT   20 54 08.7   +03 55 07     1.373    2.247  139.7   17.0   227   12.7 
2026-07-05 00:00 UT   20 53 43.7   +04 01 60     1.365    2.244  140.5   16.8   226   12.7 
2026-07-06 00:00 UT   20 53 17.1   +04 08 40     1.357    2.242  141.3   16.5   225   12.6 
2026-07-07 00:00 UT   20 52 49.1   +04 15 08     1.349    2.239  142.1   16.2   224   12.6 
2026-07-08 00:00 UT   20 52 19.6   +04 21 22     1.341    2.237  142.8   15.9   223   12.6 
2026-07-09 00:00 UT   20 51 48.6   +04 27 22     1.333    2.234  143.6   15.7   221   12.6 
2026-07-10 00:00 UT   20 51 16.2   +04 33 09     1.326    2.232  144.4   15.4   220   12.6 
2026-07-11 00:00 UT   20 50 42.4   +04 38 41     1.318    2.230  145.1   15.1   219   12.5 
2026-07-12 00:00 UT   20 50 07.2   +04 43 59     1.311    2.227  145.9   14.8   217   12.5 
2026-07-13 00:00 UT   20 49 30.6   +04 49 01     1.304    2.225  146.6   14.6   216   12.5 
2026-07-14 00:00 UT   20 48 52.8   +04 53 48     1.298    2.222  147.3   14.3   215   12.5 
2026-07-15 00:00 UT   20 48 13.7   +04 58 19     1.291    2.220  148.0   14.0   213   12.4 
2026-07-16 00:00 UT   20 47 33.4   +05 02 34     1.285    2.218  148.7   13.8   211   12.4 
2026-07-17 00:00 UT   20 46 52.0   +05 06 33     1.279    2.215  149.4   13.5   210   12.4 

    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.