2010 PY4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	9 Aug 2026	25.0	3.273 AU	4.082 AU	10h59m	-03°39'	32.6°	9.6°
Opposition	9 May 2027	22.3	2.518 AU	1.559 AU	14h30m	-39°33'	156.6°	9.2°

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
2026-08-09 00:00 UT   10 59 16.1   -03 39 25     4.082    3.273   32.6    9.6   128   25.0 
2026-08-09 08:20 UT   10 59 40.1   -03 41 57     4.084    3.273   32.4    9.6   128   25.0 
2026-08-10 00:00 UT   11 00 25.4   -03 46 43     4.087    3.271   32.0    9.4   128   25.0 
2026-08-11 00:00 UT   11 01 34.9   -03 54 04     4.092    3.269   31.4    9.3   129   25.0 
2026-08-12 00:00 UT   11 02 44.7   -04 01 29     4.097    3.268   30.8    9.1   129   25.0 
2026-08-13 00:00 UT   11 03 54.7   -04 08 56     4.102    3.266   30.2    9.0   129   25.0 
2026-08-14 00:00 UT   11 05 04.9   -04 16 27     4.106    3.264   29.6    8.8   130   25.0 
2026-08-15 00:00 UT   11 06 15.3   -04 24 01     4.111    3.262   29.0    8.6   130   25.0 
2026-08-16 00:00 UT   11 07 26.0   -04 31 37     4.115    3.260   28.4    8.5   131   25.0 
2026-08-17 00:00 UT   11 08 36.9   -04 39 17     4.119    3.258   27.8    8.3   131   24.9 
2026-08-18 00:00 UT   11 09 47.9   -04 46 60     4.123    3.256   27.2    8.2   132   24.9 
2026-08-19 00:00 UT   11 10 59.2   -04 54 45     4.127    3.254   26.6    8.0   132   24.9 
2026-08-20 00:00 UT   11 12 10.7   -05 02 34     4.131    3.252   26.0    7.8   133   24.9 
2026-08-21 00:00 UT   11 13 22.4   -05 10 25     4.135    3.250   25.4    7.7   134   24.9 
2026-08-22 00:00 UT   11 14 34.3   -05 18 19     4.138    3.248   24.8    7.5   134   24.9 
2026-08-23 00:00 UT   11 15 46.4   -05 26 16     4.141    3.246   24.2    7.3   135   24.9 
2026-08-24 00:00 UT   11 16 58.7   -05 34 16     4.144    3.244   23.7    7.2   135   24.9 
2026-08-25 00:00 UT   11 18 11.1   -05 42 18     4.147    3.242   23.1    7.0   136   24.9 
2026-08-26 00:00 UT   11 19 23.8   -05 50 23     4.150    3.239   22.5    6.9   137   24.9 
2026-08-27 00:00 UT   11 20 36.6   -05 58 31     4.153    3.237   22.0    6.7   138   24.9 
2026-08-28 00:00 UT   11 21 49.6   -06 06 41     4.155    3.235   21.4    6.5   138   24.9 
2026-08-29 00:00 UT   11 23 02.8   -06 14 54     4.157    3.233   20.8    6.4   139   24.9 
2026-08-30 00:00 UT   11 24 16.2   -06 23 09     4.159    3.231   20.3    6.2   140   24.9 
2026-08-31 00:00 UT   11 25 29.7   -06 31 27     4.161    3.229   19.7    6.1   141   24.8 
2026-09-01 00:00 UT   11 26 43.4   -06 39 48     4.163    3.227   19.2    5.9   142   24.8 
2026-09-02 00:00 UT   11 27 57.3   -06 48 11     4.165    3.225   18.6    5.7   143   24.8 
2026-09-03 00:00 UT   11 29 11.3   -06 56 37     4.166    3.223   18.1    5.6   144   24.8 
2026-09-04 00:00 UT   11 30 25.6   -07 05 05     4.168    3.221   17.6    5.4   145   24.8 

    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.