(397) Vienna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	11 Apr 2026	14.4	2.467 AU	2.448 AU	20h06m	-10°03'	79.3°	23.5°
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
2026-04-11 00:00 UT   20 06 30.2   -10 03 14     2.448    2.467   79.3   23.5   260   14.4 
2026-04-11 03:06 UT   20 06 40.2   -10 02 01     2.446    2.467   79.4   23.5   260   14.4 
2026-04-12 00:00 UT   20 07 47.0   -09 53 47     2.434    2.464   79.9   23.6   259   14.4 
2026-04-13 00:00 UT   20 09 03.1   -09 44 17     2.419    2.462   80.6   23.7   259   14.3 
2026-04-14 00:00 UT   20 10 18.6   -09 34 43     2.404    2.459   81.2   23.8   259   14.3 
2026-04-15 00:00 UT   20 11 33.3   -09 25 05     2.389    2.456   81.8   23.8   259   14.3 
2026-04-16 00:00 UT   20 12 47.3   -09 15 24     2.375    2.454   82.5   23.9   259   14.3 
2026-04-17 00:00 UT   20 14 00.6   -09 05 39     2.360    2.451   83.1   24.0   258   14.3 
2026-04-18 00:00 UT   20 15 13.1   -08 55 51     2.345    2.448   83.7   24.1   258   14.3 
2026-04-19 00:00 UT   20 16 24.9   -08 46 00     2.331    2.446   84.4   24.1   258   14.3 
2026-04-20 00:00 UT   20 17 35.9   -08 36 06     2.316    2.443   85.0   24.2   258   14.2 
2026-04-21 00:00 UT   20 18 46.2   -08 26 08     2.301    2.440   85.6   24.2   258   14.2 
2026-04-22 00:00 UT   20 19 55.7   -08 16 07     2.287    2.437   86.3   24.3   257   14.2 
2026-04-23 00:00 UT   20 21 04.4   -08 06 03     2.272    2.435   86.9   24.3   257   14.2 
2026-04-24 00:00 UT   20 22 12.3   -07 55 57     2.257    2.432   87.6   24.4   257   14.2 
2026-04-25 00:00 UT   20 23 19.4   -07 45 47     2.243    2.429   88.2   24.4   257   14.2 
2026-04-26 00:00 UT   20 24 25.6   -07 35 35     2.228    2.427   88.9   24.5   256   14.2 
2026-04-27 00:00 UT   20 25 31.1   -07 25 20     2.214    2.424   89.5   24.5   256   14.1 
2026-04-28 00:00 UT   20 26 35.7   -07 15 02     2.199    2.421   90.2   24.6   256   14.1 
2026-04-29 00:00 UT   20 27 39.4   -07 04 41     2.185    2.419   90.8   24.6   256   14.1 
2026-04-30 00:00 UT   20 28 42.3   -06 54 18     2.170    2.416   91.5   24.6   255   14.1 
2026-05-01 00:00 UT   20 29 44.3   -06 43 53     2.156    2.413   92.1   24.7   255   14.1 
2026-05-02 00:00 UT   20 30 45.5   -06 33 26     2.141    2.410   92.8   24.7   255   14.1 
2026-05-03 00:00 UT   20 31 45.7   -06 22 56     2.127    2.408   93.5   24.7   255   14.0 
2026-05-04 00:00 UT   20 32 45.0   -06 12 24     2.112    2.405   94.1   24.7   255   14.0 
2026-05-05 00:00 UT   20 33 43.4   -06 01 49     2.098    2.402   94.8   24.7   254   14.0 
2026-05-06 00:00 UT   20 34 40.8   -05 51 13     2.084    2.400   95.5   24.7   254   14.0 
2026-05-07 00:00 UT   20 35 37.3   -05 40 35     2.069    2.397   96.1   24.7   254   14.0 

    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.