(415029) 2011 UL21
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	8 Jan 2026	22.2	3.497 AU	3.488 AU	23h31m	+33°09'	82.4°	16.2°

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
2026-01-08 00:00 UT   23 31 14.2   +33 09 34     3.488    3.497   82.4   16.2    57   22.2 
2026-01-08 22:00 UT   23 32 03.5   +33 05 15     3.499    3.496   81.8   16.2    57   22.2 
2026-01-09 00:00 UT   23 32 08.0   +33 04 52     3.500    3.496   81.7   16.2    57   22.2 
2026-01-10 00:00 UT   23 33 02.5   +33 00 21     3.512    3.495   81.0   16.1    56   22.2 
2026-01-11 00:00 UT   23 33 57.7   +32 55 60     3.525    3.495   80.2   16.1    56   22.3 
2026-01-12 00:00 UT   23 34 53.6   +32 51 48     3.537    3.494   79.5   16.1    55   22.3 
2026-01-13 00:00 UT   23 35 50.0   +32 47 47     3.549    3.493   78.8   16.0    55   22.3 
2026-01-14 00:00 UT   23 36 47.1   +32 43 55     3.561    3.493   78.0   16.0    55   22.3 
2026-01-15 00:00 UT   23 37 44.9   +32 40 13     3.574    3.492   77.3   16.0    54   22.3 
2026-01-16 00:00 UT   23 38 43.2   +32 36 41     3.586    3.491   76.6   15.9    54   22.3 
2026-01-17 00:00 UT   23 39 42.2   +32 33 18     3.598    3.490   75.9   15.9    53   22.3 
2026-01-18 00:00 UT   23 40 41.7   +32 30 05     3.610    3.489   75.1   15.8    53   22.3 
2026-01-19 00:00 UT   23 41 41.9   +32 27 01     3.622    3.489   74.4   15.8    53   22.3 
2026-01-20 00:00 UT   23 42 42.6   +32 24 07     3.634    3.488   73.7   15.7    52   22.3 
2026-01-21 00:00 UT   23 43 43.8   +32 21 22     3.646    3.487   73.0   15.7    52   22.3 
2026-01-22 00:00 UT   23 44 45.6   +32 18 46     3.658    3.486   72.3   15.6    51   22.3 
2026-01-23 00:00 UT   23 45 47.9   +32 16 20     3.669    3.485   71.5   15.5    51   22.3 
2026-01-24 00:00 UT   23 46 50.8   +32 14 02     3.681    3.484   70.8   15.5    51   22.3 
2026-01-25 00:00 UT   23 47 54.1   +32 11 54     3.693    3.483   70.1   15.4    50   22.3 
2026-01-26 00:00 UT   23 48 58.0   +32 09 54     3.704    3.483   69.4   15.3    50   22.3 
2026-01-27 00:00 UT   23 50 02.3   +32 08 03     3.716    3.482   68.7   15.3    50   22.3 
2026-01-28 00:00 UT   23 51 07.2   +32 06 20     3.727    3.481   68.0   15.2    49   22.3 
2026-01-29 00:00 UT   23 52 12.5   +32 04 47     3.739    3.480   67.3   15.1    49   22.3 
2026-01-30 00:00 UT   23 53 18.2   +32 03 21     3.750    3.479   66.6   15.1    48   22.3 
2026-01-31 00:00 UT   23 54 24.4   +32 02 04     3.761    3.478   65.9   15.0    48   22.3 
2026-02-01 00:00 UT   23 55 31.1   +32 00 55     3.772    3.477   65.2   14.9    48   22.3 
2026-02-02 00:00 UT   23 56 38.1   +31 59 54     3.783    3.476   64.6   14.8    47   22.4 
2026-02-03 00:00 UT   23 57 45.6   +31 59 01     3.794    3.475   63.9   14.8    47   22.4 
2026-02-04 00:00 UT   23 58 53.6   +31 58 16     3.805    3.474   63.2   14.7    47   22.4 
2026-02-05 00:00 UT   00 00 01.9   +31 57 39     3.816    3.472   62.5   14.6    46   22.4 
2026-02-06 00:00 UT   00 01 10.7   +31 57 09     3.826    3.471   61.8   14.5    46   22.4 
2026-02-07 00:00 UT   00 02 19.8   +31 56 47     3.837    3.470   61.2   14.4    45   22.4 

    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.