(397) Vienna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	3 Jun 2026	13.4	2.325 AU	1.704 AU	20h54m	-00°49'	115.3°	23.2°
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
2026-06-03 00:00 UT   20 54 01.8   +00 49 49     1.704    2.325  115.3   23.2   246   13.4 
2026-06-03 11:26 UT   20 54 13.0   +00 44 47     1.698    2.324  115.6   23.2   246   13.4 
2026-06-04 00:00 UT   20 54 25.0   +00 39 16     1.692    2.323  116.0   23.1   245   13.4 
2026-06-05 00:00 UT   20 54 46.9   +00 28 45     1.679    2.320  116.8   23.0   245   13.4 
2026-06-06 00:00 UT   20 55 07.3   +00 18 17     1.667    2.318  117.5   22.8   245   13.4 
2026-06-07 00:00 UT   20 55 26.2   +00 07 53     1.655    2.315  118.3   22.7   244   13.4 
2026-06-08 00:00 UT   20 55 43.7   +00 02 28     1.643    2.312  119.1   22.6   244   13.3 
2026-06-09 00:00 UT   20 55 59.7   +00 12 46     1.631    2.310  119.8   22.4   243   13.3 
2026-06-10 00:00 UT   20 56 14.2   +00 22 59     1.619    2.307  120.6   22.3   243   13.3 
2026-06-11 00:00 UT   20 56 27.1   +00 33 08     1.607    2.305  121.4   22.1   242   13.3 
2026-06-12 00:00 UT   20 56 38.6   +00 43 13     1.595    2.302  122.1   21.9   242   13.2 
2026-06-13 00:00 UT   20 56 48.4   +00 53 13     1.584    2.300  122.9   21.8   241   13.2 
2026-06-14 00:00 UT   20 56 56.8   +01 03 07     1.572    2.297  123.7   21.6   241   13.2 
2026-06-15 00:00 UT   20 57 03.5   +01 12 56     1.561    2.294  124.5   21.4   240   13.2 
2026-06-16 00:00 UT   20 57 08.7   +01 22 39     1.550    2.292  125.3   21.2   240   13.1 
2026-06-17 00:00 UT   20 57 12.3   +01 32 16     1.539    2.289  126.1   21.0   239   13.1 
2026-06-18 00:00 UT   20 57 14.3   +01 41 47     1.528    2.287  126.9   20.8   239   13.1 
2026-06-19 00:00 UT   20 57 14.7   +01 51 11     1.517    2.284  127.7   20.6   238   13.1 
2026-06-20 00:00 UT   20 57 13.5   +02 00 29     1.507    2.282  128.4   20.4   238   13.0 
2026-06-21 00:00 UT   20 57 10.7   +02 09 38     1.496    2.279  129.2   20.2   237   13.0 
2026-06-22 00:00 UT   20 57 06.3   +02 18 41     1.486    2.277  130.0   20.0   236   13.0 
2026-06-23 00:00 UT   20 57 00.3   +02 27 35     1.475    2.274  130.8   19.8   236   13.0 
2026-06-24 00:00 UT   20 56 52.7   +02 36 21     1.465    2.271  131.7   19.5   235   12.9 
2026-06-25 00:00 UT   20 56 43.5   +02 44 59     1.455    2.269  132.5   19.3   234   12.9 
2026-06-26 00:00 UT   20 56 32.7   +02 53 27     1.446    2.266  133.3   19.1   234   12.9 
2026-06-27 00:00 UT   20 56 20.3   +03 01 47     1.436    2.264  134.1   18.8   233   12.9 
2026-06-28 00:00 UT   20 56 06.3   +03 09 57     1.426    2.261  134.9   18.6   232   12.8 
2026-06-29 00:00 UT   20 55 50.7   +03 17 57     1.417    2.259  135.7   18.3   231   12.8 
2026-06-30 00:00 UT   20 55 33.5   +03 25 47     1.408    2.256  136.5   18.1   230   12.8 
2026-07-01 00:00 UT   20 55 14.7   +03 33 26     1.399    2.254  137.3   17.8   230   12.8 
2026-07-02 00:00 UT   20 54 54.4   +03 40 54     1.390    2.251  138.1   17.6   229   12.7 
2026-07-03 00:00 UT   20 54 32.5   +03 48 11     1.381    2.249  138.9   17.3   228   12.7 

    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.