(189) Phthia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	27 May 2026	14.1	2.542 AU	2.133 AU	11h10m	+03°46'	101.8°	23.0°
Opposition	14 Jul 2027	12.4	2.432 AU	1.423 AU	19h30m	-12°50'	171.1°	3.7°

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
2026-05-27 00:00 UT   11 10 32.9   +03 46 36     2.133    2.542  101.8   23.0   113   14.1 
2026-05-27 11:51 UT   11 10 52.5   +03 45 36     2.140    2.542  101.4   23.0   113   14.1 
2026-05-28 00:00 UT   11 11 12.8   +03 44 33     2.146    2.542  101.0   23.0   113   14.1 
2026-05-29 00:00 UT   11 11 53.8   +03 42 21     2.158    2.542  100.2   23.1   113   14.2 
2026-05-30 00:00 UT   11 12 35.9   +03 40 01     2.171    2.542   99.4   23.2   113   14.2 
2026-05-31 00:00 UT   11 13 19.0   +03 37 33     2.184    2.542   98.6   23.2   113   14.2 
2026-06-01 00:00 UT   11 14 03.2   +03 34 57     2.196    2.542   97.9   23.3   113   14.2 
2026-06-02 00:00 UT   11 14 48.4   +03 32 13     2.209    2.542   97.1   23.3   113   14.2 
2026-06-03 00:00 UT   11 15 34.6   +03 29 21     2.221    2.542   96.3   23.4   113   14.2 
2026-06-04 00:00 UT   11 16 21.7   +03 26 22     2.234    2.542   95.6   23.4   113   14.2 
2026-06-05 00:00 UT   11 17 09.9   +03 23 15     2.247    2.542   94.8   23.4   113   14.3 
2026-06-06 00:00 UT   11 17 59.0   +03 19 60     2.259    2.542   94.1   23.5   113   14.3 
2026-06-07 00:00 UT   11 18 49.0   +03 16 38     2.272    2.542   93.3   23.5   113   14.3 
2026-06-08 00:00 UT   11 19 40.0   +03 13 08     2.285    2.542   92.6   23.5   113   14.3 
2026-06-09 00:00 UT   11 20 31.8   +03 09 31     2.298    2.542   91.9   23.5   113   14.3 
2026-06-10 00:00 UT   11 21 24.6   +03 05 47     2.310    2.542   91.1   23.5   113   14.3 
2026-06-11 00:00 UT   11 22 18.3   +03 01 56     2.323    2.542   90.4   23.5   113   14.3 
2026-06-12 00:00 UT   11 23 12.8   +02 57 58     2.336    2.542   89.7   23.5   113   14.3 
2026-06-13 00:00 UT   11 24 08.2   +02 53 53     2.348    2.542   89.0   23.5   113   14.4 
2026-06-14 00:00 UT   11 25 04.4   +02 49 41     2.361    2.542   88.3   23.5   113   14.4 
2026-06-15 00:00 UT   11 26 01.5   +02 45 23     2.374    2.542   87.5   23.5   113   14.4 
2026-06-16 00:00 UT   11 26 59.4   +02 40 58     2.387    2.542   86.8   23.5   113   14.4 
2026-06-17 00:00 UT   11 27 58.1   +02 36 26     2.399    2.542   86.1   23.5   113   14.4 
2026-06-18 00:00 UT   11 28 57.5   +02 31 48     2.412    2.542   85.4   23.5   113   14.4 
2026-06-19 00:00 UT   11 29 57.8   +02 27 04     2.425    2.542   84.7   23.5   113   14.4 
2026-06-20 00:00 UT   11 30 58.8   +02 22 13     2.437    2.542   84.1   23.4   113   14.4 
2026-06-21 00:00 UT   11 32 00.5   +02 17 16     2.450    2.542   83.4   23.4   113   14.4 
2026-06-22 00:00 UT   11 33 03.0   +02 12 14     2.462    2.542   82.7   23.4   113   14.5 
2026-06-23 00:00 UT   11 34 06.2   +02 07 05     2.475    2.542   82.0   23.3   113   14.5 
2026-06-24 00:00 UT   11 35 10.1   +02 01 51     2.488    2.541   81.3   23.3   113   14.5 
2026-06-25 00:00 UT   11 36 14.7   +01 56 31     2.500    2.541   80.7   23.2   113   14.5 
2026-06-26 00:00 UT   11 37 19.9   +01 51 05     2.513    2.541   80.0   23.2   113   14.5 

    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.