2010 PY4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	18 Oct 2026	24.7	3.121 AU	4.066 AU	12h27m	-13°50'	16.0°	5.1°
Opposition	9 May 2027	22.3	2.516 AU	1.557 AU	14h30m	-39°34'	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)                : 0.3070711
            a (Semimajor axis)              : 2.7046896
            i (Inclination)                 : 14.62891
            Ω (Longitude of ascending node) : 304.48996
            ω (Argument of perihelion)      : 18.34231
            M (Mean anomaly)                : 226.14113
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 322.27568
            B (Latitude of perihelion)      : 4.55858
            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
2026-10-18 00:00 UT   12 27 00.6   -13 50 19     4.066    3.121   16.0    5.1   256   24.7 
2026-10-18 12:14 UT   12 27 41.1   -13 55 18     4.063    3.119   16.3    5.1   256   24.7 
2026-10-19 00:00 UT   12 28 20.0   -14 00 06     4.061    3.118   16.5    5.2   257   24.7 
2026-10-20 00:00 UT   12 29 39.5   -14 09 53     4.055    3.116   17.0    5.4   258   24.7 
2026-10-21 00:00 UT   12 30 59.0   -14 19 42     4.048    3.113   17.5    5.5   259   24.7 
2026-10-22 00:00 UT   12 32 18.6   -14 29 32     4.042    3.111   18.1    5.7   260   24.7 
2026-10-23 00:00 UT   12 33 38.3   -14 39 23     4.035    3.109   18.6    5.9   262   24.7 
2026-10-24 00:00 UT   12 34 58.0   -14 49 15     4.029    3.106   19.1    6.0   262   24.7 
2026-10-25 00:00 UT   12 36 17.8   -14 59 08     4.022    3.104   19.7    6.2   263   24.7 
2026-10-26 00:00 UT   12 37 37.6   -15 09 01     4.015    3.101   20.2    6.4   264   24.7 
2026-10-27 00:00 UT   12 38 57.5   -15 18 55     4.008    3.099   20.8    6.5   265   24.7 
2026-10-28 00:00 UT   12 40 17.4   -15 28 51     4.001    3.096   21.4    6.7   266   24.7 
2026-10-29 00:00 UT   12 41 37.4   -15 38 47     3.993    3.094   21.9    6.9   267   24.7 
2026-10-30 00:00 UT   12 42 57.5   -15 48 43     3.986    3.091   22.5    7.1   267   24.7 
2026-10-31 00:00 UT   12 44 17.5   -15 58 41     3.978    3.089   23.1    7.2   268   24.7 
2026-11-01 00:00 UT   12 45 37.7   -16 08 39     3.970    3.086   23.6    7.4   269   24.7 
2026-11-02 00:00 UT   12 46 57.8   -16 18 38     3.962    3.084   24.2    7.6   269   24.7 
2026-11-03 00:00 UT   12 48 18.0   -16 28 38     3.954    3.081   24.8    7.8   270   24.7 
2026-11-04 00:00 UT   12 49 38.3   -16 38 38     3.946    3.079   25.4    7.9   270   24.7 
2026-11-05 00:00 UT   12 50 58.5   -16 48 39     3.937    3.076   26.0    8.1   271   24.7 
2026-11-06 00:00 UT   12 52 18.8   -16 58 40     3.928    3.074   26.6    8.3   271   24.7 
2026-11-07 00:00 UT   12 53 39.1   -17 08 42     3.920    3.071   27.2    8.5   272   24.7 
2026-11-08 00:00 UT   12 54 59.5   -17 18 45     3.911    3.069   27.7    8.6   272   24.7 
2026-11-09 00:00 UT   12 56 19.8   -17 28 47     3.902    3.066   28.3    8.8   273   24.7 
2026-11-10 00:00 UT   12 57 40.2   -17 38 51     3.893    3.064   28.9    9.0   273   24.7 

    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.