2010 PY4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	12 Jul 2025	25.0	3.480 AU	4.459 AU	08h21m	+18°51'	13.7°	4.0°
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
2025-07-12 00:00 UT   08 21 52.2   +18 51 45     4.459    3.480   13.7    4.0   106   25.0 
2025-07-12 05:47 UT   08 22 10.1   +18 50 22     4.460    3.480   13.6    3.9   106   25.0 
2025-07-13 00:00 UT   08 23 06.7   +18 46 01     4.463    3.481   13.1    3.8   106   25.0 
2025-07-14 00:00 UT   08 24 21.3   +18 40 16     4.467    3.481   12.5    3.6   106   25.0 
2025-07-15 00:00 UT   08 25 35.8   +18 34 29     4.471    3.482   11.8    3.4   107   25.0 
2025-07-16 00:00 UT   08 26 50.3   +18 28 39     4.475    3.483   11.2    3.2   107   25.0 
2025-07-17 00:00 UT   08 28 04.7   +18 22 48     4.478    3.484   10.5    3.1   108   25.0 
2025-07-18 00:00 UT   08 29 19.1   +18 16 54     4.482    3.485    9.9    2.9   108   25.0 
2025-07-19 00:00 UT   08 30 33.5   +18 10 59     4.485    3.486    9.3    2.7   109   25.0 
2025-07-20 00:00 UT   08 31 47.8   +18 05 02     4.488    3.487    8.6    2.5   109   25.0 
2025-07-21 00:00 UT   08 33 02.1   +17 59 02     4.491    3.487    8.0    2.3   110   25.0 
2025-07-22 00:00 UT   08 34 16.3   +17 53 01     4.494    3.488    7.3    2.1   111   25.0 
2025-07-23 00:00 UT   08 35 30.5   +17 46 58     4.496    3.489    6.7    1.9   112   24.9 
2025-07-24 00:00 UT   08 36 44.6   +17 40 53     4.498    3.490    6.1    1.8   113   24.9 
2025-07-25 00:00 UT   08 37 58.6   +17 34 46     4.501    3.491    5.4    1.6   114   24.9 
2025-07-26 00:00 UT   08 39 12.6   +17 28 37     4.503    3.492    4.8    1.4   116   24.9 
2025-07-27 00:00 UT   08 40 26.4   +17 22 26     4.504    3.492    4.2    1.2   118   24.9 
2025-07-28 00:00 UT   08 41 40.2   +17 16 13     4.506    3.493    3.5    1.0   121   24.9 
2025-07-29 00:00 UT   08 42 53.9   +17 09 59     4.507    3.494    2.9    0.9   125   24.9 
2025-07-30 00:00 UT   08 44 07.5   +17 03 43     4.509    3.495    2.4    0.7   131   24.8 
2025-07-31 00:00 UT   08 45 21.0   +16 57 25     4.510    3.495    1.8    0.5   140   24.8 
2025-08-01 00:00 UT   08 46 34.4   +16 51 05     4.511    3.496    1.3    0.4   157   24.8 
2025-08-02 00:00 UT   08 47 47.7   +16 44 43     4.511    3.497    1.1    0.3   186   24.8 
2025-08-03 00:00 UT   08 49 00.9   +16 38 20     4.512    3.498    1.2    0.3   218   24.8 
2025-08-04 00:00 UT   08 50 14.0   +16 31 55     4.512    3.498    1.6    0.5   240   24.8 
2025-08-05 00:00 UT   08 51 27.0   +16 25 29     4.513    3.499    2.1    0.6   252   24.8 
2025-08-06 00:00 UT   08 52 39.8   +16 19 00     4.513    3.500    2.7    0.8   260   24.9 
2025-08-07 00:00 UT   08 53 52.6   +16 12 30     4.512    3.501    3.3    1.0   264   24.9 
2025-08-08 00:00 UT   08 55 05.2   +16 05 59     4.512    3.501    3.9    1.1   268   24.9 

    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.