2010 PY4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	25 Oct 2025	25.3	3.534 AU	3.963 AU	10h17m	+06°47'	57.7°	13.8°
Opposition	23 Feb 2026	23.8	3.497 AU	2.519 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)                : 0.3065209
            a (Semimajor axis)              : 2.7057960
            i (Inclination)                 : 14.62765
            Ω (Longitude of ascending node) : 304.48742
            ω (Argument of perihelion)      : 18.33592
            M (Mean anomaly)                : 181.83099
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 322.26701
            B (Latitude of perihelion)      : 4.55665
            P (Orbital period in years)     : 4.45            
        

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
2025-10-25 00:00 UT   10 17 37.6   +06 47 28     3.963    3.534   57.7   13.8   289   25.3 
2025-10-25 19:51 UT   10 18 18.4   +06 41 31     3.952    3.534   58.4   13.9   289   25.2 
2025-10-26 00:00 UT   10 18 26.8   +06 40 16     3.950    3.534   58.5   13.9   289   25.2 
2025-10-27 00:00 UT   10 19 15.5   +06 33 05     3.937    3.534   59.3   14.0   289   25.2 
2025-10-28 00:00 UT   10 20 03.6   +06 25 56     3.924    3.534   60.0   14.1   289   25.2 
2025-10-29 00:00 UT   10 20 51.2   +06 18 48     3.911    3.534   60.8   14.2   289   25.2 
2025-10-30 00:00 UT   10 21 38.2   +06 11 41     3.897    3.534   61.6   14.3   289   25.2 
2025-10-31 00:00 UT   10 22 24.7   +06 04 35     3.884    3.535   62.4   14.4   289   25.2 
2025-11-01 00:00 UT   10 23 10.6   +05 57 31     3.870    3.535   63.1   14.5   289   25.2 
2025-11-02 00:00 UT   10 23 55.9   +05 50 28     3.857    3.535   63.9   14.6   289   25.2 
2025-11-03 00:00 UT   10 24 40.6   +05 43 26     3.843    3.535   64.7   14.7   290   25.2 
2025-11-04 00:00 UT   10 25 24.7   +05 36 27     3.829    3.535   65.5   14.8   290   25.2 
2025-11-05 00:00 UT   10 26 08.2   +05 29 28     3.815    3.535   66.3   14.9   290   25.2 
2025-11-06 00:00 UT   10 26 51.1   +05 22 32     3.801    3.535   67.1   15.0   290   25.2 
2025-11-07 00:00 UT   10 27 33.3   +05 15 37     3.787    3.535   67.9   15.1   290   25.2 
2025-11-08 00:00 UT   10 28 15.0   +05 08 43     3.773    3.535   68.7   15.1   290   25.2 
2025-11-09 00:00 UT   10 28 56.0   +05 01 52     3.759    3.535   69.5   15.2   290   25.2 
2025-11-10 00:00 UT   10 29 36.3   +04 55 02     3.744    3.535   70.3   15.3   290   25.2 
2025-11-11 00:00 UT   10 30 16.0   +04 48 14     3.730    3.535   71.1   15.4   290   25.2 
2025-11-12 00:00 UT   10 30 55.0   +04 41 29     3.715    3.535   71.9   15.4   290   25.2 
2025-11-13 00:00 UT   10 31 33.3   +04 34 45     3.701    3.535   72.7   15.5   290   25.2 
2025-11-14 00:00 UT   10 32 10.9   +04 28 04     3.686    3.535   73.5   15.6   290   25.2 
2025-11-15 00:00 UT   10 32 47.8   +04 21 24     3.671    3.535   74.3   15.6   290   25.2 
2025-11-16 00:00 UT   10 33 24.0   +04 14 47     3.657    3.535   75.2   15.7   291   25.1 
2025-11-17 00:00 UT   10 33 59.5   +04 08 13     3.642    3.535   76.0   15.7   291   25.1 
2025-11-18 00:00 UT   10 34 34.2   +04 01 40     3.627    3.535   76.8   15.8   291   25.1 
2025-11-19 00:00 UT   10 35 08.2   +03 55 11     3.612    3.535   77.7   15.9   291   25.1 
2025-11-20 00:00 UT   10 35 41.4   +03 48 44     3.597    3.535   78.5   15.9   291   25.1 
2025-11-21 00:00 UT   10 36 13.8   +03 42 19     3.582    3.535   79.3   15.9   291   25.1 
2025-11-22 00:00 UT   10 36 45.4   +03 35 58     3.567    3.535   80.2   16.0   291   25.1 
2025-11-23 00:00 UT   10 37 16.3   +03 29 39     3.551    3.535   81.0   16.0   291   25.1 
2025-11-24 00:00 UT   10 37 46.3   +03 23 23     3.536    3.535   81.9   16.1   291   25.1 

    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.