(415029) 2011 UL21
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	12 Aug 2026	21.8	2.971 AU	3.174 AU	04h22m	+46°00'	69.3°	18.6°

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 2011 UL21 are:

            e (Eccentricity)                : 0.6537389
            a (Semimajor axis)              : 2.1223847
            i (Inclination)                 : 34.88596
            Ω (Longitude of ascending node) : 275.31457
            ω (Argument of perihelion)      : 284.98019
            M (Mean anomaly)                : 177.74571
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 203.38086
            B (Latitude of perihelion)      : -33.53921
            P (Orbital period in years)     : 3.09            
        

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
2026-08-12 00:00 UT   04 22 34.9   +46 00 45     3.174    2.971   69.3   18.6   269   21.8 
2026-08-12 05:14 UT   04 22 51.4   +46 01 56     3.170    2.970   69.5   18.6   269   21.8 
2026-08-13 00:00 UT   04 23 50.3   +46 06 11     3.157    2.967   70.0   18.7   269   21.7 
2026-08-14 00:00 UT   04 25 05.1   +46 11 38     3.141    2.963   70.6   18.8   269   21.7 
2026-08-15 00:00 UT   04 26 19.2   +46 17 05     3.124    2.958   71.3   18.9   269   21.7 
2026-08-16 00:00 UT   04 27 32.8   +46 22 32     3.107    2.954   71.9   19.0   269   21.7 
2026-08-17 00:00 UT   04 28 45.6   +46 27 60     3.090    2.949   72.6   19.1   268   21.7 
2026-08-18 00:00 UT   04 29 57.8   +46 33 27     3.073    2.945   73.2   19.2   268   21.7 
2026-08-19 00:00 UT   04 31 09.3   +46 38 55     3.056    2.940   73.9   19.3   268   21.7 
2026-08-20 00:00 UT   04 32 20.1   +46 44 23     3.039    2.936   74.6   19.4   268   21.7 
2026-08-21 00:00 UT   04 33 30.2   +46 49 51     3.021    2.931   75.2   19.5   268   21.6 
2026-08-22 00:00 UT   04 34 39.5   +46 55 20     3.004    2.927   75.9   19.6   267   21.6 
2026-08-23 00:00 UT   04 35 48.0   +47 00 49     2.987    2.922   76.6   19.7   267   21.6 
2026-08-24 00:00 UT   04 36 55.7   +47 06 18     2.969    2.918   77.2   19.8   267   21.6 
2026-08-25 00:00 UT   04 38 02.7   +47 11 48     2.952    2.913   77.9   19.8   267   21.6 
2026-08-26 00:00 UT   04 39 08.8   +47 17 19     2.934    2.908   78.6   19.9   267   21.6 
2026-08-27 00:00 UT   04 40 14.0   +47 22 49     2.917    2.904   79.3   20.0   266   21.6 
2026-08-28 00:00 UT   04 41 18.4   +47 28 21     2.899    2.899   80.0   20.1   266   21.6 
2026-08-29 00:00 UT   04 42 21.9   +47 33 52     2.882    2.894   80.6   20.1   266   21.5 
2026-08-30 00:00 UT   04 43 24.4   +47 39 25     2.864    2.890   81.3   20.2   266   21.5 
2026-08-31 00:00 UT   04 44 26.0   +47 44 58     2.846    2.885   82.0   20.3   266   21.5 
2026-09-01 00:00 UT   04 45 26.6   +47 50 31     2.828    2.880   82.7   20.3   265   21.5 
2026-09-02 00:00 UT   04 46 26.2   +47 56 06     2.811    2.875   83.4   20.4   265   21.5 
2026-09-03 00:00 UT   04 47 24.7   +48 01 41     2.793    2.871   84.1   20.5   265   21.5 
2026-09-04 00:00 UT   04 48 22.2   +48 07 16     2.775    2.866   84.8   20.5   265   21.4 
2026-09-05 00:00 UT   04 49 18.6   +48 12 53     2.757    2.861   85.5   20.6   264   21.4 
2026-09-06 00:00 UT   04 50 13.8   +48 18 30     2.739    2.856   86.3   20.6   264   21.4 
2026-09-07 00:00 UT   04 51 07.9   +48 24 08     2.721    2.851   87.0   20.7   264   21.4 
2026-09-08 00:00 UT   04 52 00.7   +48 29 46     2.703    2.846   87.7   20.7   264   21.4 
2026-09-09 00:00 UT   04 52 52.3   +48 35 25     2.685    2.841   88.4   20.8   263   21.4 
2026-09-10 00:00 UT   04 53 42.6   +48 41 06     2.667    2.836   89.1   20.8   263   21.3 
2026-09-11 00:00 UT   04 54 31.7   +48 46 46     2.649    2.831   89.9   20.8   263   21.3 

    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.