(397) Vienna
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	21 Apr 2025	13.8	3.200 AU	2.198 AU	13h50m	-17°05'	174.6°	1.7°
Today	26 Apr 2025	13.9	3.195 AU	2.194 AU	13h47m	-16°31'	172.9°	2.2°

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)                : 0.2474670
            a (Semimajor axis)              : 2.6348333
            i (Inclination)                 : 12.86931
            Ω (Longitude of ascending node) : 227.88419
            ω (Argument of perihelion)      : 139.95249
            M (Mean anomaly)                : 220.04356
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 188.55298
            B (Latitude of perihelion)      : 8.23932
            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. A more printer-friendly version of the same chart can be found below.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-04-26 00:00 UT   13 47 06.6   -16 31 36     2.194    3.195  172.9    2.2    65   13.9 
2025-04-26 01:20 UT   13 47 03.8   -16 31 10     2.194    3.195  172.9    2.2    65   13.9 
2025-04-27 00:00 UT   13 46 17.2   -16 23 55     2.194    3.194  172.1    2.5    71   13.9 
2025-04-28 00:00 UT   13 45 28.1   -16 16 12     2.195    3.193  171.1    2.8    77   13.9 
2025-04-29 00:00 UT   13 44 39.4   -16 08 28     2.195    3.192  170.2    3.1    81   13.9 
2025-04-30 00:00 UT   13 43 51.1   -16 00 42     2.196    3.191  169.1    3.4    84   13.9 
2025-05-01 00:00 UT   13 43 03.3   -15 52 56     2.197    3.190  168.1    3.7    87   13.9 
2025-05-02 00:00 UT   13 42 16.0   -15 45 10     2.199    3.189  167.0    4.1    90   14.0 
2025-05-03 00:00 UT   13 41 29.2   -15 37 23     2.200    3.187  165.9    4.4    92   14.0 
2025-05-04 00:00 UT   13 40 43.0   -15 29 38     2.202    3.186  164.8    4.8    94   14.0 
2025-05-05 00:00 UT   13 39 57.5   -15 21 52     2.205    3.185  163.7    5.1    95   14.0 
2025-05-06 00:00 UT   13 39 12.6   -15 14 09     2.207    3.184  162.5    5.5    96   14.0 
2025-05-07 00:00 UT   13 38 28.5   -15 06 26     2.210    3.183  161.4    5.8    98   14.1 
2025-05-08 00:00 UT   13 37 45.1   -14 58 46     2.213    3.182  160.3    6.1    99   14.1 
2025-05-09 00:00 UT   13 37 02.5   -14 51 08     2.217    3.180  159.2    6.5   100   14.1 
2025-05-10 00:00 UT   13 36 20.7   -14 43 32     2.220    3.179  158.0    6.8   100   14.1 
2025-05-11 00:00 UT   13 35 39.7   -14 35 59     2.224    3.178  156.9    7.2   101   14.1 
2025-05-12 00:00 UT   13 34 59.7   -14 28 30     2.229    3.177  155.8    7.5   102   14.2 
2025-05-13 00:00 UT   13 34 20.5   -14 21 04     2.233    3.176  154.6    7.8   103   14.2 
2025-05-14 00:00 UT   13 33 42.3   -14 13 41     2.238    3.174  153.5    8.2   103   14.2 
2025-05-15 00:00 UT   13 33 05.1   -14 06 23     2.243    3.173  152.4    8.5   104   14.2 
2025-05-16 00:00 UT   13 32 28.9   -13 59 10     2.248    3.172  151.2    8.8   104   14.2 
2025-05-17 00:00 UT   13 31 53.7   -13 52 01     2.254    3.171  150.1    9.1   105   14.3 
2025-05-18 00:00 UT   13 31 19.5   -13 44 57     2.259    3.169  149.0    9.5   105   14.3 
2025-05-19 00:00 UT   13 30 46.5   -13 37 58     2.265    3.168  147.9    9.8   105   14.3 
2025-05-20 00:00 UT   13 30 14.5   -13 31 05     2.272    3.167  146.8   10.1   106   14.3 
2025-05-21 00:00 UT   13 29 43.6   -13 24 17     2.278    3.166  145.7   10.4   106   14.3 
2025-05-22 00:00 UT   13 29 13.9   -13 17 36     2.285    3.164  144.6   10.7   106   14.3 
2025-05-23 00:00 UT   13 28 45.3   -13 11 01     2.292    3.163  143.5   11.0   107   14.4 
2025-05-24 00:00 UT   13 28 17.9   -13 04 32     2.299    3.162  142.4   11.3   107   14.4 
2025-05-25 00:00 UT   13 27 51.7   -12 58 10     2.306    3.161  141.3   11.6   107   14.4 
2025-05-26 00:00 UT   13 27 26.7   -12 51 55     2.314    3.159  140.2   11.8   108   14.4 

    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.