2010 PY4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	10 Dec 2025	24.9	3.532 AU	3.290 AU	10h43m	+01°50'	96.1°	16.1°
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
2025-12-10 00:00 UT   10 43 47.4   +01 50 40     3.290    3.532   96.1   16.1   293   24.9 
2025-12-10 05:08 UT   10 43 50.6   +01 49 32     3.287    3.532   96.3   16.1   293   24.9 
2025-12-11 00:00 UT   10 44 02.0   +01 45 24     3.275    3.532   97.0   16.1   293   24.9 
2025-12-12 00:00 UT   10 44 15.5   +01 40 13     3.259    3.532   97.9   16.0   293   24.9 
2025-12-13 00:00 UT   10 44 28.1   +01 35 06     3.244    3.532   98.8   16.0   293   24.9 
2025-12-14 00:00 UT   10 44 39.5   +01 30 04     3.229    3.532   99.8   15.9   293   24.9 
2025-12-15 00:00 UT   10 44 49.9   +01 25 06     3.213    3.531  100.7   15.9   293   24.9 
2025-12-16 00:00 UT   10 44 59.3   +01 20 13     3.198    3.531  101.7   15.8   294   24.9 
2025-12-17 00:00 UT   10 45 07.6   +01 15 25     3.183    3.531  102.6   15.8   294   24.8 
2025-12-18 00:00 UT   10 45 14.8   +01 10 42     3.168    3.531  103.6   15.7   294   24.8 
2025-12-19 00:00 UT   10 45 20.9   +01 06 04     3.153    3.530  104.5   15.7   294   24.8 
2025-12-20 00:00 UT   10 45 25.9   +01 01 30     3.138    3.530  105.5   15.6   294   24.8 
2025-12-21 00:00 UT   10 45 29.7   +00 57 02     3.123    3.530  106.4   15.5   294   24.8 
2025-12-22 00:00 UT   10 45 32.5   +00 52 40     3.108    3.530  107.4   15.4   294   24.8 
2025-12-23 00:00 UT   10 45 34.1   +00 48 22     3.093    3.529  108.4   15.3   294   24.8 
2025-12-24 00:00 UT   10 45 34.6   +00 44 10     3.079    3.529  109.4   15.2   295   24.8 
2025-12-25 00:00 UT   10 45 33.9   +00 40 04     3.064    3.529  110.4   15.1   295   24.7 
2025-12-26 00:00 UT   10 45 32.0   +00 36 03     3.049    3.528  111.3   15.0   295   24.7 
2025-12-27 00:00 UT   10 45 29.0   +00 32 08     3.035    3.528  112.3   14.9   295   24.7 
2025-12-28 00:00 UT   10 45 24.9   +00 28 19     3.021    3.528  113.3   14.8   295   24.7 
2025-12-29 00:00 UT   10 45 19.5   +00 24 36     3.006    3.527  114.3   14.7   295   24.7 
2025-12-30 00:00 UT   10 45 13.0   +00 20 58     2.992    3.527  115.3   14.6   296   24.7 
2025-12-31 00:00 UT   10 45 05.3   +00 17 27     2.978    3.527  116.4   14.5   296   24.7 
2026-01-01 00:00 UT   10 44 56.4   +00 14 01     2.964    3.526  117.4   14.3   296   24.6 
2026-01-02 00:00 UT   10 44 46.4   +00 10 42     2.951    3.526  118.4   14.2   296   24.6 
2026-01-03 00:00 UT   10 44 35.1   +00 07 29     2.937    3.526  119.4   14.1   296   24.6 
2026-01-04 00:00 UT   10 44 22.6   +00 04 23     2.923    3.525  120.5   13.9   297   24.6 
2026-01-05 00:00 UT   10 44 09.0   +00 01 22     2.910    3.525  121.5   13.8   297   24.6 
2026-01-06 00:00 UT   10 43 54.1   +00 01 31     2.897    3.524  122.5   13.6   297   24.6 
2026-01-07 00:00 UT   10 43 38.0   +00 04 18     2.884    3.524  123.6   13.4   297   24.5 
2026-01-08 00:00 UT   10 43 20.8   +00 06 59     2.871    3.524  124.6   13.3   298   24.5 
2026-01-09 00:00 UT   10 43 02.3   +00 09 32     2.858    3.523  125.7   13.1   298   24.5 

    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.