(78) Diana
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	9 Nov 2025	14.4	3.113 AU	3.688 AU	18h19m	-28°35'	48.0°	13.7°
Opposition	27 Aug 2026	12.3	3.068 AU	2.057 AU	22h23m	-09°49'	179.7°	0.1°

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 Diana are:

            e (Eccentricity)                : 0.2034928
            a (Semimajor axis)              : 2.6226327
            i (Inclination)                 : 8.67873
            Ω (Longitude of ascending node) : 333.28676
            ω (Argument of perihelion)      : 153.28498
            M (Mean anomaly)                : 155.05893
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 306.83579
            B (Latitude of perihelion)      : 3.88964
            P (Orbital period in years)     : 4.25            
        

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
2025-11-09 00:00 UT   18 19 22.8   -28 35 30     3.688    3.113   48.0   13.7    93   14.4 
2025-11-09 02:00 UT   18 19 30.1   -28 35 18     3.689    3.113   48.0   13.7    93   14.4 
2025-11-10 00:00 UT   18 20 49.7   -28 33 05     3.699    3.114   47.3   13.5    93   14.4 
2025-11-11 00:00 UT   18 22 16.8   -28 30 38     3.710    3.115   46.6   13.4    93   14.4 
2025-11-12 00:00 UT   18 23 44.3   -28 28 09     3.721    3.115   46.0   13.2    93   14.4 
2025-11-13 00:00 UT   18 25 12.1   -28 25 38     3.732    3.116   45.3   13.0    93   14.4 
2025-11-14 00:00 UT   18 26 40.2   -28 23 05     3.743    3.117   44.6   12.9    93   14.4 
2025-11-15 00:00 UT   18 28 08.5   -28 20 29     3.753    3.118   43.9   12.7    92   14.4 
2025-11-16 00:00 UT   18 29 37.2   -28 17 52     3.764    3.118   43.3   12.6    92   14.4 
2025-11-17 00:00 UT   18 31 06.1   -28 15 12     3.774    3.119   42.6   12.4    92   14.4 
2025-11-18 00:00 UT   18 32 35.3   -28 12 29     3.785    3.120   41.9   12.2    92   14.4 
2025-11-19 00:00 UT   18 34 04.7   -28 09 45     3.795    3.120   41.2   12.1    92   14.4 
2025-11-20 00:00 UT   18 35 34.4   -28 06 58     3.805    3.121   40.6   11.9    92   14.4 
2025-11-21 00:00 UT   18 37 04.3   -28 04 09     3.815    3.122   39.9   11.7    92   14.4 
2025-11-22 00:00 UT   18 38 34.5   -28 01 17     3.824    3.122   39.2   11.5    92   14.4 
2025-11-23 00:00 UT   18 40 04.8   -27 58 23     3.834    3.123   38.5   11.4    92   14.4 
2025-11-24 00:00 UT   18 41 35.4   -27 55 26     3.843    3.123   37.9   11.2    92   14.4 
2025-11-25 00:00 UT   18 43 06.2   -27 52 27     3.853    3.124   37.2   11.0    92   14.4 
2025-11-26 00:00 UT   18 44 37.2   -27 49 26     3.862    3.125   36.5   10.8    92   14.4 
2025-11-27 00:00 UT   18 46 08.3   -27 46 22     3.871    3.125   35.9   10.7    92   14.4 
2025-11-28 00:00 UT   18 47 39.7   -27 43 15     3.880    3.126   35.2   10.5    92   14.4 
2025-11-29 00:00 UT   18 49 11.2   -27 40 06     3.889    3.127   34.5   10.3    92   14.4 
2025-11-30 00:00 UT   18 50 42.8   -27 36 54     3.897    3.127   33.9   10.1    92   14.4 
2025-12-01 00:00 UT   18 52 14.7   -27 33 40     3.906    3.128   33.2    9.9    92   14.4 
2025-12-02 00:00 UT   18 53 46.6   -27 30 23     3.914    3.128   32.5    9.8    92   14.4 
2025-12-03 00:00 UT   18 55 18.8   -27 27 03     3.922    3.129   31.9    9.6    92   14.4 
2025-12-04 00:00 UT   18 56 51.0   -27 23 40     3.930    3.129   31.2    9.4    92   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.