(415029) 2011 UL21
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	23 Sep 2026	21.1	2.770 AU	2.432 AU	05h02m	+49°55'	98.9°	21.0°

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
2026-09-23 00:00 UT   05 02 24.5   +49 55 41     2.432    2.770   98.9   21.0   259   21.1 
2026-09-23 11:57 UT   05 02 38.9   +49 58 34     2.423    2.767   99.3   21.0   259   21.1 
2026-09-24 00:00 UT   05 02 53.0   +50 01 29     2.414    2.765   99.7   21.0   259   21.1 
2026-09-25 00:00 UT   05 03 19.7   +50 07 16     2.396    2.759  100.4   20.9   258   21.1 
2026-09-26 00:00 UT   05 03 44.4   +50 13 04     2.378    2.754  101.2   20.9   258   21.0 
2026-09-27 00:00 UT   05 04 07.2   +50 18 51     2.360    2.749  102.0   20.9   257   21.0 
2026-09-28 00:00 UT   05 04 28.0   +50 24 38     2.342    2.744  102.8   20.9   257   21.0 
2026-09-29 00:00 UT   05 04 46.7   +50 30 25     2.324    2.738  103.6   20.8   257   21.0 
2026-09-30 00:00 UT   05 05 03.4   +50 36 12     2.306    2.733  104.4   20.8   256   21.0 
2026-10-01 00:00 UT   05 05 17.8   +50 41 58     2.288    2.727  105.2   20.8   256   20.9 
2026-10-02 00:00 UT   05 05 30.1   +50 47 44     2.271    2.722  106.0   20.7   255   20.9 
2026-10-03 00:00 UT   05 05 40.0   +50 53 28     2.253    2.717  106.8   20.7   255   20.9 
2026-10-04 00:00 UT   05 05 47.6   +50 59 12     2.235    2.711  107.6   20.6   254   20.9 
2026-10-05 00:00 UT   05 05 52.9   +51 04 54     2.218    2.706  108.4   20.5   254   20.8 
2026-10-06 00:00 UT   05 05 55.6   +51 10 35     2.200    2.700  109.2   20.5   253   20.8 
2026-10-07 00:00 UT   05 05 55.9   +51 16 14     2.183    2.695  110.1   20.4   253   20.8 
2026-10-08 00:00 UT   05 05 53.5   +51 21 50     2.165    2.689  110.9   20.3   252   20.8 
2026-10-09 00:00 UT   05 05 48.6   +51 27 25     2.148    2.683  111.7   20.2   251   20.7 
2026-10-10 00:00 UT   05 05 40.9   +51 32 57     2.131    2.678  112.6   20.1   251   20.7 
2026-10-11 00:00 UT   05 05 30.5   +51 38 26     2.114    2.672  113.4   20.1   250   20.7 
2026-10-12 00:00 UT   05 05 17.4   +51 43 51     2.097    2.667  114.2   20.0   250   20.7 
2026-10-13 00:00 UT   05 05 01.3   +51 49 13     2.080    2.661  115.1   19.9   249   20.6 
2026-10-14 00:00 UT   05 04 42.4   +51 54 31     2.063    2.655  115.9   19.7   248   20.6 
2026-10-15 00:00 UT   05 04 20.5   +51 59 44     2.046    2.650  116.8   19.6   247   20.6 
2026-10-16 00:00 UT   05 03 55.6   +52 04 52     2.029    2.644  117.6   19.5   247   20.6 
2026-10-17 00:00 UT   05 03 27.6   +52 09 54     2.013    2.638  118.5   19.4   246   20.5 
2026-10-18 00:00 UT   05 02 56.5   +52 14 51     1.996    2.632  119.4   19.3   245   20.5 
2026-10-19 00:00 UT   05 02 22.3   +52 19 41     1.980    2.626  120.2   19.1   244   20.5 
2026-10-20 00:00 UT   05 01 44.8   +52 24 24     1.964    2.621  121.1   19.0   243   20.5 
2026-10-21 00:00 UT   05 01 04.2   +52 28 60     1.948    2.615  122.0   18.8   243   20.4 
2026-10-22 00:00 UT   05 00 20.2   +52 33 27     1.932    2.609  122.8   18.7   242   20.4 
2026-10-23 00:00 UT   04 59 32.9   +52 37 46     1.916    2.603  123.7   18.5   241   20.4 

    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.