(189) Phthia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	10 Mar 2026	12.6	2.535 AU	1.546 AU	11h27m	-01°22'	174.0°	2.4°
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)                : 0.0372475
            a (Semimajor axis)              : 2.4504721
            i (Inclination)                 : 5.17306
            Ω (Longitude of ascending node) : 203.27285
            ω (Argument of perihelion)      : 169.29425
            M (Mean anomaly)                : 129.27473
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 192.60970
            B (Latitude of perihelion)      : 0.95971
            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
2026-03-10 00:00 UT   11 27 40.7   -01 22 58     1.546    2.535  174.0    2.4   341   12.6 
2026-03-10 05:38 UT   11 27 28.5   -01 21 14     1.545    2.535  174.2    2.3   343   12.6 
2026-03-11 00:00 UT   11 26 48.5   -01 15 35     1.545    2.535  174.7    2.1   351   12.6 
2026-03-12 00:00 UT   11 25 56.3   -01 08 08     1.544    2.535  175.3    1.8     4   12.6 
2026-03-13 00:00 UT   11 25 04.0   -01 00 37     1.544    2.536  175.6    1.7    19   12.5 
2026-03-14 00:00 UT   11 24 11.8   +00 53 03     1.543    2.536  175.5    1.7    35   12.6 
2026-03-15 00:00 UT   11 23 19.6   +00 45 27     1.544    2.536  175.2    1.9    50   12.6 
2026-03-16 00:00 UT   11 22 27.6   +00 37 49     1.544    2.536  174.5    2.2    62   12.6 
2026-03-17 00:00 UT   11 21 35.9   +00 30 09     1.545    2.536  173.7    2.5    71   12.6 
2026-03-18 00:00 UT   11 20 44.5   +00 22 29     1.546    2.536  172.7    2.8    78   12.6 
2026-03-19 00:00 UT   11 19 53.5   +00 14 48     1.547    2.536  171.7    3.2    83   12.7 
2026-03-20 00:00 UT   11 19 03.0   +00 07 07     1.549    2.537  170.6    3.7    87   12.7 
2026-03-21 00:00 UT   11 18 12.9   +00 00 33     1.551    2.537  169.5    4.1    90   12.7 
2026-03-22 00:00 UT   11 17 23.5   +00 08 11     1.553    2.537  168.4    4.5    93   12.7 
2026-03-23 00:00 UT   11 16 34.7   +00 15 48     1.555    2.537  167.3    5.0    95   12.8 
2026-03-24 00:00 UT   11 15 46.6   +00 23 23     1.558    2.537  166.1    5.4    97   12.8 
2026-03-25 00:00 UT   11 14 59.3   +00 30 54     1.561    2.537  164.9    5.9    98   12.8 
2026-03-26 00:00 UT   11 14 12.9   +00 38 23     1.564    2.537  163.8    6.3    99   12.8 
2026-03-27 00:00 UT   11 13 27.3   +00 45 48     1.568    2.537  162.6    6.8   100   12.9 
2026-03-28 00:00 UT   11 12 42.6   +00 53 08     1.572    2.538  161.4    7.2   101   12.9 
2026-03-29 00:00 UT   11 11 59.0   +01 00 24     1.576    2.538  160.3    7.6   102   12.9 
2026-03-30 00:00 UT   11 11 16.4   +01 07 35     1.580    2.538  159.1    8.1   103   13.0 
2026-03-31 00:00 UT   11 10 34.8   +01 14 41     1.584    2.538  157.9    8.5   104   13.0 
2026-04-01 00:00 UT   11 09 54.4   +01 21 41     1.589    2.538  156.8    8.9   104   13.0 
2026-04-02 00:00 UT   11 09 15.2   +01 28 35     1.594    2.538  155.6    9.4   105   13.0 
2026-04-03 00:00 UT   11 08 37.1   +01 35 22     1.599    2.538  154.4    9.8   105   13.1 
2026-04-04 00:00 UT   11 08 00.3   +01 42 03     1.605    2.538  153.3   10.2   106   13.1 
2026-04-05 00:00 UT   11 07 24.7   +01 48 36     1.611    2.538  152.1   10.6   106   13.1 
2026-04-06 00:00 UT   11 06 50.5   +01 55 02     1.617    2.539  151.0   11.0   107   13.1 
2026-04-07 00:00 UT   11 06 17.6   +02 01 20     1.623    2.539  149.9   11.4   107   13.1 
2026-04-08 00:00 UT   11 05 46.0   +02 07 30     1.629    2.539  148.7   11.8   107   13.2 
2026-04-09 00:00 UT   11 05 15.8   +02 13 32     1.636    2.539  147.6   12.2   107   13.2 

    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.