(415029) 2011 UL21
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	22 Oct 2026	20.4	2.609 AU	1.932 AU	05h00m	+52°33'	122.8°	18.7°

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)                : 0.6538340
            a (Semimajor axis)              : 2.1223157
            i (Inclination)                 : 34.88704
            Ω (Longitude of ascending node) : 275.31036
            ω (Argument of perihelion)      : 284.97994
            M (Mean anomaly)                : 241.51950
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 203.37657
            B (Latitude of perihelion)      : -33.54028
            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
2026-10-22 00:00 UT   05 00 20.2   +52 33 27     1.932    2.609  122.8   18.7   242   20.4 
2026-10-22 14:57 UT   04 59 51.1   +52 36 10     1.922    2.605  123.4   18.6   241   20.4 
2026-10-23 00:00 UT   04 59 32.9   +52 37 46     1.916    2.603  123.7   18.5   241   20.4 
2026-10-24 00:00 UT   04 58 42.2   +52 41 55     1.900    2.597  124.6   18.4   240   20.3 
2026-10-25 00:00 UT   04 57 48.2   +52 45 55     1.884    2.591  125.5   18.2   239   20.3 
2026-10-26 00:00 UT   04 56 50.7   +52 49 43     1.869    2.585  126.3   18.0   238   20.3 
2026-10-27 00:00 UT   04 55 49.7   +52 53 20     1.854    2.579  127.2   17.9   237   20.3 
2026-10-28 00:00 UT   04 54 45.2   +52 56 44     1.839    2.573  128.1   17.7   236   20.2 
2026-10-29 00:00 UT   04 53 37.3   +52 59 56     1.824    2.567  129.0   17.5   234   20.2 
2026-10-30 00:00 UT   04 52 25.7   +53 02 53     1.809    2.561  129.8   17.3   233   20.2 
2026-10-31 00:00 UT   04 51 10.7   +53 05 36     1.794    2.555  130.7   17.1   232   20.1 
2026-11-01 00:00 UT   04 49 52.0   +53 08 03     1.780    2.549  131.6   16.9   231   20.1 
2026-11-02 00:00 UT   04 48 29.8   +53 10 14     1.766    2.543  132.4   16.7   229   20.1 
2026-11-03 00:00 UT   04 47 04.1   +53 12 07     1.751    2.537  133.3   16.5   228   20.1 
2026-11-04 00:00 UT   04 45 34.8   +53 13 41     1.738    2.530  134.1   16.3   226   20.0 
2026-11-05 00:00 UT   04 44 02.0   +53 14 55     1.724    2.524  135.0   16.1   225   20.0 
2026-11-06 00:00 UT   04 42 25.7   +53 15 49     1.710    2.518  135.8   15.9   223   20.0 
2026-11-07 00:00 UT   04 40 46.0   +53 16 22     1.697    2.512  136.7   15.7   222   19.9 
2026-11-08 00:00 UT   04 39 02.9   +53 16 32     1.684    2.506  137.5   15.5   220   19.9 
2026-11-09 00:00 UT   04 37 16.5   +53 16 18     1.671    2.499  138.3   15.3   218   19.9 
2026-11-10 00:00 UT   04 35 26.8   +53 15 39     1.658    2.493  139.1   15.1   217   19.8 
2026-11-11 00:00 UT   04 33 34.0   +53 14 34     1.646    2.487  139.9   14.9   215   19.8 
2026-11-12 00:00 UT   04 31 38.2   +53 13 03     1.634    2.480  140.7   14.6   213   19.8 
2026-11-13 00:00 UT   04 29 39.4   +53 11 04     1.622    2.474  141.5   14.4   211   19.8 
2026-11-14 00:00 UT   04 27 37.8   +53 08 36     1.610    2.467  142.2   14.2   209   19.7 
2026-11-15 00:00 UT   04 25 33.5   +53 05 38     1.598    2.461  142.9   14.0   207   19.7 
2026-11-16 00:00 UT   04 23 26.6   +53 02 09     1.587    2.454  143.6   13.8   204   19.7 
2026-11-17 00:00 UT   04 21 17.4   +52 58 09     1.576    2.448  144.3   13.6   202   19.6 
2026-11-18 00:00 UT   04 19 05.8   +52 53 36     1.565    2.441  145.0   13.4   200   19.6 
2026-11-19 00:00 UT   04 16 52.2   +52 48 31     1.555    2.435  145.6   13.3   197   19.6 
2026-11-20 00:00 UT   04 14 36.7   +52 42 51     1.544    2.428  146.2   13.1   195   19.6 
2026-11-21 00:00 UT   04 12 19.4   +52 36 36     1.534    2.422  146.7   12.9   192   19.5 

    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.