(397) Vienna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	9 Feb 2026	14.8	2.631 AU	3.274 AU	18h32m	-17°10'	42.4°	14.6°
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
2026-02-09 00:00 UT   18 32 44.1   -17 10 42     3.274    2.631   42.4   14.6   273   14.8 
2026-02-09 03:04 UT   18 32 57.2   -17 10 10     3.273    2.630   42.4   14.7   273   14.8 
2026-02-10 00:00 UT   18 34 26.8   -17 06 23     3.263    2.628   43.0   14.8   273   14.8 
2026-02-11 00:00 UT   18 36 09.3   -17 01 58     3.251    2.625   43.6   15.0   273   14.8 
2026-02-12 00:00 UT   18 37 51.5   -16 57 27     3.239    2.623   44.2   15.2   273   14.8 
2026-02-13 00:00 UT   18 39 33.6   -16 52 50     3.227    2.620   44.7   15.4   272   14.8 
2026-02-14 00:00 UT   18 41 15.4   -16 48 07     3.216    2.617   45.3   15.6   272   14.8 
2026-02-15 00:00 UT   18 42 57.0   -16 43 19     3.204    2.615   45.9   15.8   272   14.8 
2026-02-16 00:00 UT   18 44 38.3   -16 38 25     3.191    2.612   46.5   15.9   272   14.8 
2026-02-17 00:00 UT   18 46 19.3   -16 33 25     3.179    2.609   47.1   16.1   271   14.8 
2026-02-18 00:00 UT   18 48 00.1   -16 28 20     3.167    2.607   47.7   16.3   271   14.8 
2026-02-19 00:00 UT   18 49 40.7   -16 23 09     3.155    2.604   48.3   16.5   271   14.8 
2026-02-20 00:00 UT   18 51 20.9   -16 17 52     3.142    2.602   48.9   16.6   271   14.8 
2026-02-21 00:00 UT   18 53 00.9   -16 12 30     3.130    2.599   49.5   16.8   270   14.8 
2026-02-22 00:00 UT   18 54 40.5   -16 07 02     3.117    2.596   50.1   17.0   270   14.8 
2026-02-23 00:00 UT   18 56 19.9   -16 01 28     3.104    2.594   50.7   17.2   270   14.8 
2026-02-24 00:00 UT   18 57 59.0   -15 55 49     3.092    2.591   51.3   17.3   270   14.8 
2026-02-25 00:00 UT   18 59 37.7   -15 50 04     3.079    2.588   51.9   17.5   269   14.8 
2026-02-26 00:00 UT   19 01 16.1   -15 44 14     3.066    2.586   52.5   17.7   269   14.8 
2026-02-27 00:00 UT   19 02 54.3   -15 38 18     3.053    2.583   53.1   17.9   269   14.8 
2026-02-28 00:00 UT   19 04 32.0   -15 32 17     3.040    2.580   53.7   18.0   269   14.8 
2026-03-01 00:00 UT   19 06 09.5   -15 26 10     3.027    2.578   54.3   18.2   269   14.8 

    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.