(415029) 2011 UL21
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	26 Jan 2026	22.3	3.483 AU	3.704 AU	23h48m	+32°09'	69.4°	15.3°

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
2026-01-26 00:00 UT   23 48 58.0   +32 09 54     3.704    3.483   69.4   15.3    50   22.3 
2026-01-26 02:03 UT   23 49 03.5   +32 09 44     3.705    3.482   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 
2026-02-08 00:00 UT   00 03 29.4   +31 56 33     3.847    3.469   60.5   14.3    45   22.4 
2026-02-09 00:00 UT   00 04 39.4   +31 56 26     3.858    3.468   59.8   14.2    45   22.4 
2026-02-10 00:00 UT   00 05 49.7   +31 56 27     3.868    3.467   59.1   14.1    44   22.4 
2026-02-11 00:00 UT   00 07 00.4   +31 56 34     3.878    3.466   58.5   14.0    44   22.4 
2026-02-12 00:00 UT   00 08 11.5   +31 56 50     3.888    3.464   57.8   14.0    43   22.4 
2026-02-13 00:00 UT   00 09 22.9   +31 57 12     3.898    3.463   57.2   13.9    43   22.4 
2026-02-14 00:00 UT   00 10 34.8   +31 57 41     3.908    3.462   56.5   13.8    43   22.4 
2026-02-15 00:00 UT   00 11 46.9   +31 58 17     3.918    3.461   55.8   13.7    42   22.4 
2026-02-16 00:00 UT   00 12 59.4   +31 58 60     3.927    3.460   55.2   13.6    42   22.4 
2026-02-17 00:00 UT   00 14 12.3   +31 59 50     3.937    3.458   54.5   13.5    41   22.4 
2026-02-18 00:00 UT   00 15 25.5   +32 00 46     3.946    3.457   53.9   13.4    41   22.4 
2026-02-19 00:00 UT   00 16 39.0   +32 01 49     3.955    3.456   53.3   13.3    41   22.4 
2026-02-20 00:00 UT   00 17 52.8   +32 02 58     3.964    3.454   52.6   13.1    40   22.4 
2026-02-21 00:00 UT   00 19 07.0   +32 04 14     3.973    3.453   52.0   13.0    40   22.4 
2026-02-22 00:00 UT   00 20 21.5   +32 05 36     3.982    3.452   51.3   12.9    39   22.4 
2026-02-23 00:00 UT   00 21 36.2   +32 07 04     3.991    3.450   50.7   12.8    39   22.4 
2026-02-24 00:00 UT   00 22 51.3   +32 08 39     3.999    3.449   50.1   12.7    38   22.4 
2026-02-25 00:00 UT   00 24 06.6   +32 10 19     4.008    3.448   49.5   12.6    38   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.