2010 PY4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	20 Sep 2026	24.7	3.186 AU	4.167 AU	11h50m	-09°25'	10.8°	3.4°
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)                : 0.3070710
            a (Semimajor axis)              : 2.7046895
            i (Inclination)                 : 14.62893
            Ω (Longitude of ascending node) : 304.48995
            ω (Argument of perihelion)      : 18.34234
            M (Mean anomaly)                : 226.14112
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 322.27570
            B (Latitude of perihelion)      : 4.55859
            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
2026-09-20 00:00 UT   11 50 32.7   -09 25 34     4.167    3.186   10.8    3.4   176   24.7 
2026-09-20 11:37 UT   11 51 09.8   -09 29 58     4.166    3.184   10.6    3.3   178   24.7 
2026-09-21 00:00 UT   11 51 49.4   -09 34 40     4.165    3.183   10.5    3.3   179   24.7 
2026-09-22 00:00 UT   11 53 06.2   -09 43 47     4.164    3.181   10.3    3.2   183   24.7 
2026-09-23 00:00 UT   11 54 23.1   -09 52 56     4.162    3.179   10.1    3.2   186   24.7 
2026-09-24 00:00 UT   11 55 40.1   -10 02 06     4.160    3.177    9.9    3.1   190   24.6 
2026-09-25 00:00 UT   11 56 57.3   -10 11 19     4.158    3.174    9.8    3.1   193   24.6 
2026-09-26 00:00 UT   11 58 14.6   -10 20 33     4.156    3.172    9.7    3.1   197   24.6 
2026-09-27 00:00 UT   11 59 32.0   -10 29 49     4.154    3.170    9.7    3.0   200   24.6 
2026-09-28 00:00 UT   12 00 49.4   -10 39 07     4.151    3.168    9.7    3.1   204   24.6 
2026-09-29 00:00 UT   12 02 07.1   -10 48 26     4.148    3.165    9.7    3.1   208   24.6 
2026-09-30 00:00 UT   12 03 24.8   -10 57 47     4.145    3.163    9.8    3.1   211   24.6 
2026-10-01 00:00 UT   12 04 42.6   -11 07 10     4.142    3.161    9.9    3.1   215   24.6 
2026-10-02 00:00 UT   12 06 00.6   -11 16 34     4.139    3.158   10.1    3.2   219   24.6 
2026-10-03 00:00 UT   12 07 18.6   -11 25 60     4.136    3.156   10.3    3.2   222   24.6 
2026-10-04 00:00 UT   12 08 36.8   -11 35 27     4.132    3.154   10.5    3.3   225   24.6 
2026-10-05 00:00 UT   12 09 55.0   -11 44 56     4.129    3.151   10.7    3.4   228   24.6 
2026-10-06 00:00 UT   12 11 13.4   -11 54 27     4.125    3.149   11.0    3.5   231   24.6 
2026-10-07 00:00 UT   12 12 31.8   -12 03 59     4.121    3.147   11.3    3.6   234   24.6 
2026-10-08 00:00 UT   12 13 50.4   -12 13 32     4.117    3.144   11.7    3.7   237   24.6 
2026-10-09 00:00 UT   12 15 09.0   -12 23 07     4.112    3.142   12.0    3.8   239   24.6 
2026-10-10 00:00 UT   12 16 27.8   -12 32 44     4.108    3.140   12.4    3.9   241   24.6 
2026-10-11 00:00 UT   12 17 46.6   -12 42 21     4.103    3.137   12.8    4.0   244   24.6 
2026-10-12 00:00 UT   12 19 05.5   -12 52 00     4.099    3.135   13.2    4.2   246   24.7 
2026-10-13 00:00 UT   12 20 24.5   -13 01 40     4.094    3.133   13.6    4.3   248   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.