(415029) 2011 UL21
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	18 Apr 2026	22.2	3.352 AU	4.237 AU	01h34m	+35°19'	24.8°	7.2°

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 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
2026-04-18 00:00 UT   01 34 36.3   +35 19 20     4.237    3.352   24.8    7.2   355   22.2 
2026-04-18 21:41 UT   01 35 54.0   +35 23 51     4.237    3.350   24.6    7.2   354   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 
2026-04-23 00:00 UT   01 41 47.5   +35 44 42     4.236    3.341   23.8    7.0   348   22.2 
2026-04-24 00:00 UT   01 43 14.1   +35 49 52     4.235    3.338   23.7    6.9   347   22.2 
2026-04-25 00:00 UT   01 44 40.9   +35 55 04     4.234    3.336   23.5    6.9   345   22.2 
2026-04-26 00:00 UT   01 46 07.7   +36 00 17     4.233    3.334   23.4    6.9   344   22.2 
2026-04-27 00:00 UT   01 47 34.6   +36 05 31     4.231    3.331   23.3    6.9   342   22.2 
2026-04-28 00:00 UT   01 49 01.7   +36 10 48     4.230    3.329   23.3    6.9   341   22.2 
2026-04-29 00:00 UT   01 50 28.9   +36 16 05     4.228    3.326   23.2    6.9   339   22.2 
2026-04-30 00:00 UT   01 51 56.1   +36 21 24     4.226    3.324   23.2    6.8   338   22.2 
2026-05-01 00:00 UT   01 53 23.5   +36 26 44     4.224    3.321   23.2    6.9   336   22.2 
2026-05-02 00:00 UT   01 54 51.0   +36 32 06     4.222    3.319   23.2    6.9   334   22.2 
2026-05-03 00:00 UT   01 56 18.6   +36 37 28     4.219    3.316   23.2    6.9   333   22.2 
2026-05-04 00:00 UT   01 57 46.3   +36 42 52     4.217    3.314   23.2    6.9   331   22.2 
2026-05-05 00:00 UT   01 59 14.1   +36 48 18     4.214    3.311   23.2    6.9   330   22.2 
2026-05-06 00:00 UT   02 00 42.0   +36 53 44     4.211    3.309   23.3    6.9   328   22.2 
2026-05-07 00:00 UT   02 02 10.0   +36 59 11     4.208    3.306   23.4    7.0   327   22.2 
2026-05-08 00:00 UT   02 03 38.2   +37 04 40     4.205    3.304   23.5    7.0   325   22.2 
2026-05-09 00:00 UT   02 05 06.4   +37 10 09     4.201    3.301   23.6    7.0   324   22.2 
2026-05-10 00:00 UT   02 06 34.7   +37 15 40     4.197    3.298   23.7    7.1   322   22.2 
2026-05-11 00:00 UT   02 08 03.1   +37 21 11     4.194    3.296   23.9    7.1   321   22.2 
2026-05-12 00:00 UT   02 09 31.6   +37 26 43     4.190    3.293   24.0    7.2   320   22.2 
2026-05-13 00:00 UT   02 11 00.1   +37 32 16     4.186    3.290   24.2    7.2   318   22.2 
2026-05-14 00:00 UT   02 12 28.8   +37 37 50     4.181    3.288   24.4    7.3   317   22.2 
2026-05-15 00:00 UT   02 13 57.5   +37 43 25     4.177    3.285   24.6    7.4   316   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.