(397) Vienna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	17 Jul 2026	12.4	2.215 AU	1.279 AU	20h46m	+05°06'	149.4°	13.5°
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)                : 312.22971
            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
2026-07-17 00:00 UT   20 46 52.0   +05 06 33     1.279    2.215  149.4   13.5   210   12.4 
2026-07-17 13:28 UT   20 46 28.3   +05 08 40     1.276    2.214  149.8   13.4   209   12.4 
2026-07-18 00:00 UT   20 46 09.5   +05 10 15     1.273    2.213  150.1   13.2   208   12.4 
2026-07-19 00:00 UT   20 45 25.9   +05 13 41     1.267    2.210  150.7   13.0   206   12.3 
2026-07-20 00:00 UT   20 44 41.3   +05 16 49     1.262    2.208  151.3   12.7   204   12.3 
2026-07-21 00:00 UT   20 43 55.8   +05 19 41     1.257    2.206  151.9   12.5   202   12.3 
2026-07-22 00:00 UT   20 43 09.4   +05 22 15     1.252    2.203  152.5   12.3   200   12.3 
2026-07-23 00:00 UT   20 42 22.2   +05 24 32     1.247    2.201  153.0   12.1   198   12.3 
2026-07-24 00:00 UT   20 41 34.2   +05 26 31     1.242    2.199  153.6   11.9   196   12.3 
2026-07-25 00:00 UT   20 40 45.6   +05 28 12     1.238    2.196  154.0   11.7   193   12.2 
2026-07-26 00:00 UT   20 39 56.3   +05 29 36     1.233    2.194  154.5   11.5   191   12.2 
2026-07-27 00:00 UT   20 39 06.5   +05 30 42     1.229    2.192  154.9   11.3   189   12.2 
2026-07-28 00:00 UT   20 38 16.2   +05 31 29     1.226    2.189  155.2   11.2   186   12.2 
2026-07-29 00:00 UT   20 37 25.4   +05 31 59     1.222    2.187  155.5   11.1   183   12.2 
2026-07-30 00:00 UT   20 36 34.3   +05 32 11     1.219    2.185  155.8   11.0   181   12.2 
2026-07-31 00:00 UT   20 35 42.9   +05 32 04     1.216    2.183  156.0   10.9   178   12.2 
2026-08-01 00:00 UT   20 34 51.3   +05 31 40     1.213    2.180  156.2   10.8   175   12.1 
2026-08-02 00:00 UT   20 33 59.5   +05 30 57     1.210    2.178  156.4   10.8   172   12.1 
2026-08-03 00:00 UT   20 33 07.7   +05 29 57     1.208    2.176  156.4   10.7   169   12.1 
2026-08-04 00:00 UT   20 32 15.9   +05 28 39     1.205    2.173  156.5   10.7   166   12.1 
2026-08-05 00:00 UT   20 31 24.1   +05 27 02     1.203    2.171  156.4   10.8   163   12.1 
2026-08-06 00:00 UT   20 30 32.6   +05 25 09     1.201    2.169  156.4   10.8   161   12.1 
2026-08-07 00:00 UT   20 29 41.2   +05 22 57     1.200    2.167  156.2   10.9   158   12.1 
2026-08-08 00:00 UT   20 28 50.2   +05 20 29     1.198    2.165  156.0   11.0   155   12.1 
2026-08-09 00:00 UT   20 27 59.6   +05 17 43     1.197    2.162  155.8   11.1   152   12.1 
2026-08-10 00:00 UT   20 27 09.4   +05 14 41     1.196    2.160  155.5   11.2   149   12.1 
2026-08-11 00:00 UT   20 26 19.8   +05 11 22     1.196    2.158  155.2   11.4   147   12.1 
2026-08-12 00:00 UT   20 25 30.9   +05 07 47     1.195    2.156  154.9   11.5   144   12.1 
2026-08-13 00:00 UT   20 24 42.6   +05 03 56     1.195    2.154  154.5   11.7   141   12.1 
2026-08-14 00:00 UT   20 23 55.2   +04 59 50     1.195    2.152  154.0   11.9   139   12.1 
2026-08-15 00:00 UT   20 23 08.7   +04 55 28     1.195    2.149  153.5   12.1   137   12.1 
2026-08-16 00:00 UT   20 22 23.1   +04 50 52     1.195    2.147  153.0   12.4   134   12.1 

    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.