(189) Phthia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	22 Oct 2025	14.7	2.501 AU	2.980 AU	10h25m	+05°34'	52.4°	18.4°
Opposition	12 Mar 2026	12.6	2.536 AU	1.544 AU	11h25m	-01°04'	175.5°	1.8°

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 Phthia are:

            e (Eccentricity)                : 0.0372474
            a (Semimajor axis)              : 2.4504721
            i (Inclination)                 : 5.17306
            Ω (Longitude of ascending node) : 203.27286
            ω (Argument of perihelion)      : 169.29422
            M (Mean anomaly)                : 129.27475
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 192.60968
            B (Latitude of perihelion)      : 0.95972
            P (Orbital period in years)     : 3.84            
        

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
2025-10-22 00:00 UT   10 25 58.6   +05 34 04     2.980    2.501   52.4   18.4   288   14.7 
2025-10-22 09:16 UT   10 26 32.5   +05 30 36     2.976    2.501   52.6   18.4   288   14.7 
2025-10-23 00:00 UT   10 27 26.1   +05 25 06     2.970    2.501   53.0   18.5   289   14.7 
2025-10-24 00:00 UT   10 28 53.1   +05 16 09     2.960    2.501   53.6   18.7   289   14.7 
2025-10-25 00:00 UT   10 30 19.6   +05 07 12     2.950    2.502   54.2   18.8   289   14.7 
2025-10-26 00:00 UT   10 31 45.7   +04 58 16     2.939    2.502   54.8   19.0   289   14.7 
2025-10-27 00:00 UT   10 33 11.4   +04 49 20     2.929    2.502   55.4   19.1   289   14.7 
2025-10-28 00:00 UT   10 34 36.6   +04 40 26     2.918    2.503   56.0   19.2   289   14.7 
2025-10-29 00:00 UT   10 36 01.3   +04 31 32     2.907    2.503   56.7   19.4   289   14.7 
2025-10-30 00:00 UT   10 37 25.6   +04 22 40     2.897    2.503   57.3   19.5   289   14.7 
2025-10-31 00:00 UT   10 38 49.3   +04 13 48     2.886    2.504   57.9   19.6   289   14.7 
2025-11-01 00:00 UT   10 40 12.6   +04 04 58     2.875    2.504   58.5   19.8   290   14.7 
2025-11-02 00:00 UT   10 41 35.5   +03 56 09     2.864    2.504   59.1   19.9   290   14.7 
2025-11-03 00:00 UT   10 42 57.8   +03 47 21     2.853    2.505   59.8   20.0   290   14.7 
2025-11-04 00:00 UT   10 44 19.6   +03 38 35     2.842    2.505   60.4   20.1   290   14.6 
2025-11-05 00:00 UT   10 45 41.0   +03 29 49     2.831    2.505   61.0   20.3   290   14.6 
2025-11-06 00:00 UT   10 47 01.8   +03 21 06     2.819    2.506   61.7   20.4   290   14.6 
2025-11-07 00:00 UT   10 48 22.1   +03 12 24     2.808    2.506   62.3   20.5   290   14.6 
2025-11-08 00:00 UT   10 49 41.9   +03 03 44     2.797    2.506   62.9   20.6   290   14.6 
2025-11-09 00:00 UT   10 51 01.2   +02 55 05     2.785    2.507   63.6   20.7   290   14.6 
2025-11-10 00:00 UT   10 52 19.9   +02 46 28     2.774    2.507   64.2   20.8   290   14.6 
2025-11-11 00:00 UT   10 53 38.1   +02 37 54     2.762    2.507   64.9   20.9   291   14.6 
2025-11-12 00:00 UT   10 54 55.8   +02 29 21     2.750    2.507   65.5   21.1   291   14.6 
2025-11-13 00:00 UT   10 56 12.8   +02 20 50     2.739    2.508   66.2   21.2   291   14.6 

    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.