(174) Phaedra
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	8 May 2025	14.2	2.979 AU	3.039 AU	08h27m	+19°55'	77.0°	19.3°
Opposition	4 May 2026	11.9	2.496 AU	1.523 AU	14h21m	-34°50'	160.4°	7.8°

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 Phaedra are:

            e (Eccentricity)                : 0.1452733
            a (Semimajor axis)              : 2.8584374
            i (Inclination)                 : 12.10432
            Ω (Longitude of ascending node) : 327.26488
            ω (Argument of perihelion)      : 290.98217
            M (Mean anomaly)                : 260.43902
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 258.68134
            B (Latitude of perihelion)      : -11.29076
            P (Orbital period in years)     : 4.83            
        

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
2025-05-08 00:00 UT   08 27 21.5   +19 55 49     3.039    2.979   77.0   19.3   104   14.2 
2025-05-08 06:31 UT   08 27 36.2   +19 54 17     3.043    2.979   76.8   19.3   104   14.2 
2025-05-09 00:00 UT   08 28 15.8   +19 50 07     3.052    2.978   76.3   19.2   104   14.2 
2025-05-10 00:00 UT   08 29 10.9   +19 44 22     3.064    2.977   75.5   19.2   104   14.2 
2025-05-11 00:00 UT   08 30 06.7   +19 38 34     3.076    2.975   74.8   19.1   104   14.2 
2025-05-12 00:00 UT   08 31 03.3   +19 32 44     3.088    2.974   74.1   19.1   104   14.2 
2025-05-13 00:00 UT   08 32 00.5   +19 26 52     3.100    2.972   73.3   19.0   104   14.2 
2025-05-14 00:00 UT   08 32 58.5   +19 20 56     3.112    2.971   72.6   18.9   104   14.2 
2025-05-15 00:00 UT   08 33 57.1   +19 14 58     3.124    2.970   71.9   18.9   104   14.2 
2025-05-16 00:00 UT   08 34 56.4   +19 08 57     3.136    2.968   71.2   18.8   104   14.2 
2025-05-17 00:00 UT   08 35 56.3   +19 02 54     3.147    2.967   70.5   18.7   104   14.2 
2025-05-18 00:00 UT   08 36 57.0   +18 56 47     3.159    2.966   69.8   18.7   104   14.2 
2025-05-19 00:00 UT   08 37 58.2   +18 50 38     3.171    2.964   69.1   18.6   105   14.2 
2025-05-20 00:00 UT   08 39 00.1   +18 44 26     3.182    2.963   68.4   18.5   105   14.2 
2025-05-21 00:00 UT   08 40 02.5   +18 38 12     3.194    2.961   67.7   18.4   105   14.2 
2025-05-22 00:00 UT   08 41 05.6   +18 31 54     3.205    2.960   67.0   18.3   105   14.2 
2025-05-23 00:00 UT   08 42 09.3   +18 25 34     3.217    2.959   66.3   18.3   105   14.2 
2025-05-24 00:00 UT   08 43 13.5   +18 19 11     3.228    2.957   65.6   18.2   105   14.2 
2025-05-25 00:00 UT   08 44 18.4   +18 12 45     3.239    2.956   64.9   18.1   105   14.3 
2025-05-26 00:00 UT   08 45 23.7   +18 06 16     3.250    2.955   64.2   18.0   105   14.3 
2025-05-27 00:00 UT   08 46 29.7   +17 59 44     3.262    2.953   63.6   17.9   105   14.3 
2025-05-28 00:00 UT   08 47 36.1   +17 53 10     3.273    2.952   62.9   17.8   105   14.3 
2025-05-29 00:00 UT   08 48 43.1   +17 46 32     3.283    2.950   62.2   17.7   106   14.3 
2025-05-30 00:00 UT   08 49 50.6   +17 39 51     3.294    2.949   61.5   17.6   106   14.3 
2025-05-31 00:00 UT   08 50 58.6   +17 33 08     3.305    2.948   60.9   17.5   106   14.3 
2025-06-01 00:00 UT   08 52 07.1   +17 26 22     3.316    2.946   60.2   17.4   106   14.3 
2025-06-02 00:00 UT   08 53 16.1   +17 19 32     3.326    2.945   59.5   17.3   106   14.3 
2025-06-03 00:00 UT   08 54 25.5   +17 12 40     3.337    2.943   58.9   17.2   106   14.3 
2025-06-04 00:00 UT   08 55 35.4   +17 05 45     3.347    2.942   58.2   17.0   106   14.3 
2025-06-05 00:00 UT   08 56 45.8   +16 58 47     3.357    2.941   57.6   16.9   106   14.3 
2025-06-06 00:00 UT   08 57 56.5   +16 51 45     3.368    2.939   56.9   16.8   106   14.3 
2025-06-07 00:00 UT   08 59 07.7   +16 44 41     3.378    2.938   56.3   16.7   106   14.3 

    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.