2010 PY4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	17 Sep 2025	25.2	3.524 AU	4.354 AU	09h41m	+11°26'	30.4°	8.3°
Opposition	23 Feb 2026	23.8	3.497 AU	2.520 AU	10h11m	-00°00'	169.6°	2.9°

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 2010 PY4 are:

            e (Eccentricity)                : 0.3057039
            a (Semimajor axis)              : 2.7075572
            i (Inclination)                 : 14.62016
            Ω (Longitude of ascending node) : 304.48517
            ω (Argument of perihelion)      : 18.37777
            M (Mean anomaly)                : 137.52564
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 322.30608
            B (Latitude of perihelion)      : 4.56442
            P (Orbital period in years)     : 4.46            
        

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
2025-09-17 00:00 UT   09 41 06.0   +11 26 30     4.354    3.524   30.4    8.3   285   25.2 
2025-09-17 21:19 UT   09 42 03.1   +11 20 00     4.347    3.524   31.0    8.4   285   25.2 
2025-09-18 00:00 UT   09 42 10.3   +11 19 11     4.347    3.524   31.1    8.5   285   25.2 
2025-09-19 00:00 UT   09 43 14.3   +11 11 51     4.339    3.524   31.7    8.6   285   25.2 
2025-09-20 00:00 UT   09 44 18.0   +11 04 31     4.331    3.525   32.4    8.8   286   25.2 
2025-09-21 00:00 UT   09 45 21.4   +10 57 10     4.323    3.525   33.1    9.0   286   25.2 
2025-09-22 00:00 UT   09 46 24.6   +10 49 49     4.315    3.525   33.8    9.1   286   25.3 
2025-09-23 00:00 UT   09 47 27.4   +10 42 27     4.307    3.526   34.5    9.3   286   25.3 
2025-09-24 00:00 UT   09 48 29.8   +10 35 05     4.298    3.526   35.2    9.4   286   25.3 
2025-09-25 00:00 UT   09 49 32.0   +10 27 43     4.290    3.527   35.9    9.6   286   25.3 
2025-09-26 00:00 UT   09 50 33.8   +10 20 20     4.281    3.527   36.6    9.8   286   25.3 
2025-09-27 00:00 UT   09 51 35.3   +10 12 58     4.272    3.527   37.3    9.9   286   25.3 
2025-09-28 00:00 UT   09 52 36.5   +10 05 35     4.263    3.528   38.0   10.1   286   25.3 
2025-09-29 00:00 UT   09 53 37.3   +09 58 11     4.254    3.528   38.7   10.2   287   25.3 
2025-09-30 00:00 UT   09 54 37.7   +09 50 48     4.244    3.528   39.4   10.4   287   25.3 
2025-10-01 00:00 UT   09 55 37.8   +09 43 25     4.235    3.529   40.1   10.5   287   25.3 
2025-10-02 00:00 UT   09 56 37.6   +09 36 02     4.225    3.529   40.8   10.7   287   25.3 
2025-10-03 00:00 UT   09 57 36.9   +09 28 38     4.215    3.529   41.6   10.8   287   25.3 
2025-10-04 00:00 UT   09 58 35.9   +09 21 15     4.205    3.529   42.3   11.0   287   25.3 
2025-10-05 00:00 UT   09 59 34.6   +09 13 52     4.195    3.530   43.0   11.1   287   25.3 
2025-10-06 00:00 UT   10 00 32.8   +09 06 28     4.185    3.530   43.7   11.3   287   25.3 
2025-10-07 00:00 UT   10 01 30.7   +08 59 05     4.174    3.530   44.4   11.4   287   25.3 
2025-10-08 00:00 UT   10 02 28.1   +08 51 42     4.164    3.531   45.1   11.6   287   25.3 
2025-10-09 00:00 UT   10 03 25.2   +08 44 20     4.153    3.531   45.9   11.7   287   25.3 
2025-10-10 00:00 UT   10 04 21.9   +08 36 57     4.142    3.531   46.6   11.9   288   25.3 
2025-10-11 00:00 UT   10 05 18.1   +08 29 35     4.131    3.531   47.3   12.0   288   25.3 
2025-10-12 00:00 UT   10 06 14.0   +08 22 13     4.120    3.532   48.0   12.1   288   25.3 
2025-10-13 00:00 UT   10 07 09.4   +08 14 52     4.109    3.532   48.8   12.3   288   25.3 
2025-10-14 00:00 UT   10 08 04.4   +08 07 31     4.097    3.532   49.5   12.4   288   25.3 
2025-10-15 00:00 UT   10 08 59.0   +08 00 10     4.086    3.532   50.2   12.5   288   25.3 
2025-10-16 00:00 UT   10 09 53.1   +07 52 50     4.074    3.532   51.0   12.7   288   25.3 
2025-10-17 00:00 UT   10 10 46.8   +07 45 31     4.062    3.533   51.7   12.8   288   25.3 

    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.