(415029) 2011 UL21
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	2 Jun 2026	22.1	3.233 AU	4.067 AU	02h40m	+39°25'	30.4°	9.1°

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
2026-06-02 00:00 UT   02 40 44.7   +39 25 15     4.067    3.233   30.4    9.1   296   22.1 
2026-06-02 23:08 UT   02 42 11.2   +39 30 44     4.060    3.230   30.8    9.2   295   22.1 
2026-06-03 00:00 UT   02 42 14.4   +39 30 56     4.059    3.230   30.8    9.3   295   22.1 
2026-06-04 00:00 UT   02 43 44.1   +39 36 38     4.051    3.227   31.2    9.4   294   22.1 
2026-06-05 00:00 UT   02 45 13.8   +39 42 21     4.044    3.224   31.6    9.5   294   22.1 
2026-06-06 00:00 UT   02 46 43.6   +39 48 03     4.035    3.221   32.1    9.6   293   22.1 
2026-06-07 00:00 UT   02 48 13.3   +39 53 45     4.027    3.218   32.5    9.8   292   22.1 
2026-06-08 00:00 UT   02 49 43.1   +39 59 27     4.019    3.215   32.9    9.9   291   22.1 
2026-06-09 00:00 UT   02 51 12.9   +40 05 09     4.010    3.211   33.4   10.0   291   22.1 
2026-06-10 00:00 UT   02 52 42.6   +40 10 51     4.001    3.208   33.8   10.1   290   22.1 
2026-06-11 00:00 UT   02 54 12.4   +40 16 33     3.992    3.205   34.3   10.3   289   22.1 
2026-06-12 00:00 UT   02 55 42.2   +40 22 15     3.983    3.202   34.8   10.4   289   22.1 
2026-06-13 00:00 UT   02 57 11.9   +40 27 57     3.974    3.199   35.2   10.6   288   22.1 
2026-06-14 00:00 UT   02 58 41.7   +40 33 39     3.965    3.195   35.7   10.7   288   22.1 
2026-06-15 00:00 UT   03 00 11.4   +40 39 21     3.955    3.192   36.2   10.8   287   22.1 
2026-06-16 00:00 UT   03 01 41.1   +40 45 02     3.945    3.189   36.7   11.0   286   22.1 
2026-06-17 00:00 UT   03 03 10.7   +40 50 43     3.935    3.186   37.2   11.1   286   22.1 
2026-06-18 00:00 UT   03 04 40.3   +40 56 25     3.925    3.182   37.7   11.2   285   22.1 
2026-06-19 00:00 UT   03 06 09.9   +41 02 05     3.915    3.179   38.2   11.4   285   22.1 
2026-06-20 00:00 UT   03 07 39.4   +41 07 46     3.905    3.176   38.7   11.5   284   22.1 
2026-06-21 00:00 UT   03 09 08.8   +41 13 26     3.895    3.172   39.2   11.7   284   22.1 
2026-06-22 00:00 UT   03 10 38.2   +41 19 06     3.884    3.169   39.7   11.8   283   22.1 
2026-06-23 00:00 UT   03 12 07.5   +41 24 46     3.873    3.165   40.2   12.0   283   22.1 
2026-06-24 00:00 UT   03 13 36.8   +41 30 25     3.862    3.162   40.7   12.1   282   22.1 
2026-06-25 00:00 UT   03 15 05.9   +41 36 04     3.851    3.159   41.2   12.2   282   22.1 
2026-06-26 00:00 UT   03 16 35.0   +41 41 42     3.840    3.155   41.7   12.4   282   22.1 
2026-06-27 00:00 UT   03 18 04.0   +41 47 21     3.829    3.152   42.3   12.5   281   22.1 
2026-06-28 00:00 UT   03 19 32.9   +41 52 59     3.817    3.148   42.8   12.7   281   22.1 
2026-06-29 00:00 UT   03 21 01.7   +41 58 36     3.806    3.145   43.3   12.8   280   22.1 
2026-06-30 00:00 UT   03 22 30.5   +42 04 13     3.794    3.141   43.9   13.0   280   22.1 

    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.