(415029) 2011 UL21
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	25 Mar 2026	22.3	3.402 AU	4.186 AU	01h00m	+33°31'	33.7°	9.4°

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
2026-03-25 00:00 UT   01 00 58.5   +33 31 25     4.186    3.402   33.7    9.4    21   22.3 
2026-03-25 10:54 UT   01 01 35.8   +33 33 12     4.188    3.401   33.5    9.3    21   22.3 
2026-03-26 00:00 UT   01 02 20.7   +33 35 21     4.190    3.400   33.2    9.3    20   22.3 
2026-03-27 00:00 UT   01 03 43.0   +33 39 20     4.194    3.398   32.8    9.1    20   22.3 
2026-03-28 00:00 UT   01 05 05.5   +33 43 23     4.197    3.396   32.3    9.0    19   22.3 
2026-03-29 00:00 UT   01 06 28.2   +33 47 28     4.201    3.394   31.8    8.9    18   22.3 
2026-03-30 00:00 UT   01 07 51.1   +33 51 37     4.204    3.392   31.4    8.8    17   22.3 
2026-03-31 00:00 UT   01 09 14.1   +33 55 50     4.208    3.390   31.0    8.7    16   22.3 
2026-04-01 00:00 UT   01 10 37.3   +34 00 05     4.211    3.388   30.5    8.6    15   22.3 
2026-04-02 00:00 UT   01 12 00.6   +34 04 23     4.214    3.386   30.1    8.5    14   22.3 
2026-04-03 00:00 UT   01 13 24.2   +34 08 45     4.216    3.384   29.7    8.4    13   22.3 
2026-04-04 00:00 UT   01 14 47.9   +34 13 09     4.219    3.382   29.3    8.3    12   22.3 
2026-04-05 00:00 UT   01 16 11.7   +34 17 36     4.221    3.380   28.9    8.2    11   22.3 
2026-04-06 00:00 UT   01 17 35.8   +34 22 06     4.224    3.378   28.5    8.1    10   22.3 
2026-04-07 00:00 UT   01 18 60.0   +34 26 38     4.226    3.376   28.1    8.0     9   22.3 
2026-04-08 00:00 UT   01 20 24.3   +34 31 13     4.228    3.374   27.7    7.9     8   22.3 
2026-04-09 00:00 UT   01 21 48.8   +34 35 51     4.229    3.372   27.4    7.9     7   22.3 
2026-04-10 00:00 UT   01 23 13.5   +34 40 32     4.231    3.370   27.0    7.8     6   22.3 
2026-04-11 00:00 UT   01 24 38.4   +34 45 14     4.232    3.368   26.7    7.7     4   22.2 
2026-04-12 00:00 UT   01 26 03.3   +34 49 60     4.234    3.365   26.4    7.6     3   22.2 
2026-04-13 00:00 UT   01 27 28.5   +34 54 47     4.235    3.363   26.1    7.5     2   22.2 
2026-04-14 00:00 UT   01 28 53.8   +34 59 37     4.236    3.361   25.8    7.5     1   22.2 
2026-04-15 00:00 UT   01 30 19.2   +35 04 30     4.236    3.359   25.5    7.4   359   22.2 
2026-04-16 00:00 UT   01 31 44.8   +35 09 24     4.237    3.357   25.3    7.3   358   22.2 
2026-04-17 00:00 UT   01 33 10.5   +35 14 21     4.237    3.354   25.0    7.3   357   22.2 
2026-04-18 00:00 UT   01 34 36.3   +35 19 20     4.237    3.352   24.8    7.2   355   22.2 
2026-04-19 00:00 UT   01 36 02.3   +35 24 20     4.237    3.350   24.5    7.2   354   22.2 
2026-04-20 00:00 UT   01 37 28.4   +35 29 23     4.237    3.348   24.3    7.1   353   22.2 
2026-04-21 00:00 UT   01 38 54.7   +35 34 28     4.237    3.345   24.1    7.1   351   22.2 
2026-04-22 00:00 UT   01 40 21.0   +35 39 34     4.236    3.343   24.0    7.0   350   22.2 

    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.