2010 PY4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	9 Jan 2026	24.5	3.523 AU	2.858 AU	10h43m	-00°09'	125.7°	13.1°
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
2026-01-09 00:00 UT   10 43 02.3   +00 09 32     2.858    3.523  125.7   13.1   298   24.5 
2026-01-09 21:25 UT   10 42 44.8   +00 11 44     2.847    3.523  126.6   12.9   298   24.5 
2026-01-10 00:00 UT   10 42 42.6   +00 11 59     2.845    3.523  126.7   12.9   298   24.5 
2026-01-11 00:00 UT   10 42 21.7   +00 14 19     2.833    3.522  127.8   12.7   298   24.5 
2026-01-12 00:00 UT   10 41 59.6   +00 16 32     2.821    3.522  128.9   12.6   299   24.5 
2026-01-13 00:00 UT   10 41 36.3   +00 18 37     2.808    3.522  129.9   12.4   299   24.4 
2026-01-14 00:00 UT   10 41 11.8   +00 20 36     2.797    3.521  131.0   12.2   299   24.4 
2026-01-15 00:00 UT   10 40 46.2   +00 22 27     2.785    3.521  132.1   12.0   300   24.4 
2026-01-16 00:00 UT   10 40 19.3   +00 24 11     2.773    3.520  133.2   11.8   300   24.4 
2026-01-17 00:00 UT   10 39 51.3   +00 25 48     2.762    3.520  134.3   11.5   300   24.4 
2026-01-18 00:00 UT   10 39 22.1   +00 27 17     2.751    3.519  135.4   11.3   301   24.4 
2026-01-19 00:00 UT   10 38 51.7   +00 28 39     2.740    3.519  136.4   11.1   301   24.3 
2026-01-20 00:00 UT   10 38 20.3   +00 29 54     2.729    3.518  137.5   10.9   301   24.3 
2026-01-21 00:00 UT   10 37 47.7   +00 31 01     2.719    3.518  138.6   10.7   302   24.3 
2026-01-22 00:00 UT   10 37 14.0   +00 32 01     2.708    3.517  139.7   10.4   302   24.3 
2026-01-23 00:00 UT   10 36 39.2   +00 32 53     2.698    3.517  140.8   10.2   303   24.3 
2026-01-24 00:00 UT   10 36 03.4   +00 33 37     2.688    3.516  142.0    9.9   303   24.3 
2026-01-25 00:00 UT   10 35 26.5   +00 34 15     2.679    3.516  143.1    9.7   304   24.2 
2026-01-26 00:00 UT   10 34 48.6   +00 34 44     2.669    3.515  144.2    9.4   304   24.2 
2026-01-27 00:00 UT   10 34 09.7   +00 35 07     2.660    3.515  145.3    9.2   305   24.2 
2026-01-28 00:00 UT   10 33 29.8   +00 35 21     2.651    3.514  146.4    8.9   306   24.2 
2026-01-29 00:00 UT   10 32 48.9   +00 35 29     2.643    3.514  147.5    8.7   306   24.2 
2026-01-30 00:00 UT   10 32 07.1   +00 35 29     2.634    3.513  148.6    8.4   307   24.1 
2026-01-31 00:00 UT   10 31 24.5   +00 35 22     2.626    3.512  149.7    8.1   308   24.1 
2026-02-01 00:00 UT   10 30 40.9   +00 35 07     2.619    3.512  150.8    7.9   309   24.1 
2026-02-02 00:00 UT   10 29 56.5   +00 34 46     2.611    3.511  151.9    7.6   310   24.1 
2026-02-03 00:00 UT   10 29 11.3   +00 34 17     2.604    3.511  153.0    7.3   311   24.1 
2026-02-04 00:00 UT   10 28 25.3   +00 33 40     2.597    3.510  154.1    7.0   312   24.0 
2026-02-05 00:00 UT   10 27 38.5   +00 32 57     2.590    3.509  155.2    6.8   313   24.0 
2026-02-06 00:00 UT   10 26 51.0   +00 32 07     2.584    3.509  156.3    6.5   314   24.0 
2026-02-07 00:00 UT   10 26 02.8   +00 31 10     2.577    3.508  157.4    6.2   316   24.0 
2026-02-08 00:00 UT   10 25 14.0   +00 30 06     2.572    3.508  158.4    5.9   317   24.0 

    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.