(397) Vienna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	4 Aug 2026	12.1	2.172 AU	1.204 AU	20h31m	+05°27'	156.5°	10.8°
Today	15 Sep 2026	12.6	2.088 AU	1.293 AU	20h11m	+01°21'	130.2°	21.6°

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) : 227.87896
            ω (Argument of perihelion)      : 139.91867
            M (Mean anomaly)                : 312.22970
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 188.51382
            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
2026-09-15 00:00 UT   20 11 24.8   +01 21 57     1.293    2.088  130.2   21.6    95   12.6 
2026-09-15 14:41 UT   20 11 29.1   +01 17 06     1.296    2.087  129.7   21.8    95   12.6 
2026-09-16 00:00 UT   20 11 32.2   +01 14 03     1.298    2.086  129.4   21.9    95   12.6 
2026-09-17 00:00 UT   20 11 41.6   +01 06 10     1.304    2.085  128.5   22.2    94   12.6 
2026-09-18 00:00 UT   20 11 53.0   +00 58 20     1.310    2.083  127.7   22.4    93   12.6 
2026-09-19 00:00 UT   20 12 06.6   +00 50 32     1.316    2.081  126.9   22.7    93   12.6 
2026-09-20 00:00 UT   20 12 22.1   +00 42 47     1.323    2.079  126.1   23.0    92   12.6 
2026-09-21 00:00 UT   20 12 39.7   +00 35 06     1.329    2.078  125.3   23.2    92   12.7 
2026-09-22 00:00 UT   20 12 59.3   +00 27 28     1.336    2.076  124.5   23.5    91   12.7 
2026-09-23 00:00 UT   20 13 20.9   +00 19 54     1.342    2.074  123.7   23.7    90   12.7 
2026-09-24 00:00 UT   20 13 44.6   +00 12 24     1.349    2.073  122.9   24.0    90   12.7 
2026-09-25 00:00 UT   20 14 10.1   +00 04 59     1.356    2.071  122.1   24.2    89   12.7 
2026-09-26 00:00 UT   20 14 37.7   +00 02 21     1.363    2.069  121.3   24.5    89   12.7 
2026-09-27 00:00 UT   20 15 07.2   +00 09 36     1.370    2.068  120.5   24.7    88   12.8 
2026-09-28 00:00 UT   20 15 38.6   +00 16 45     1.377    2.066  119.7   24.9    88   12.8 
2026-09-29 00:00 UT   20 16 11.9   +00 23 49     1.384    2.064  119.0   25.1    87   12.8 
2026-09-30 00:00 UT   20 16 47.2   +00 30 47     1.391    2.063  118.2   25.3    87   12.8 
2026-10-01 00:00 UT   20 17 24.3   +00 37 39     1.399    2.061  117.4   25.5    86   12.8 
2026-10-02 00:00 UT   20 18 03.2   +00 44 24     1.406    2.060  116.7   25.7    86   12.8 
2026-10-03 00:00 UT   20 18 44.0   +00 51 02     1.414    2.058  115.9   25.9    85   12.9 
2026-10-04 00:00 UT   20 19 26.7   +00 57 34     1.421    2.056  115.1   26.1    85   12.9 
2026-10-05 00:00 UT   20 20 11.1   -01 03 58     1.429    2.055  114.4   26.3    85   12.9 
2026-10-06 00:00 UT   20 20 57.3   -01 10 16     1.437    2.053  113.6   26.5    84   12.9 
2026-10-07 00:00 UT   20 21 45.3   -01 16 25     1.445    2.052  112.9   26.7    84   12.9 
2026-10-08 00:00 UT   20 22 35.1   -01 22 27     1.453    2.050  112.2   26.8    83   12.9 
2026-10-09 00:00 UT   20 23 26.6   -01 28 21     1.461    2.049  111.4   27.0    83   12.9 
2026-10-10 00:00 UT   20 24 19.8   -01 34 06     1.469    2.047  110.7   27.2    83   13.0 
2026-10-11 00:00 UT   20 25 14.7   -01 39 44     1.477    2.046  110.0   27.3    82   13.0 
2026-10-12 00:00 UT   20 26 11.3   -01 45 12     1.485    2.045  109.3   27.4    82   13.0 
2026-10-13 00:00 UT   20 27 09.5   -01 50 32     1.494    2.043  108.5   27.6    81   13.0 
2026-10-14 00:00 UT   20 28 09.4   -01 55 43     1.502    2.042  107.8   27.7    81   13.0 
2026-10-15 00:00 UT   20 29 10.9   -02 00 45     1.510    2.040  107.1   27.9    81   13.0 

    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.