(415029) 2011 UL21
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	9 Sep 2026	21.4	2.841 AU	2.685 AU	04h52m	+48°35'	88.4°	20.8°

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
2026-09-09 00:00 UT   04 52 52.7   +48 35 25     2.685    2.841   88.4   20.8   263   21.4 
2026-09-09 07:54 UT   04 53 09.4   +48 37 17     2.679    2.839   88.6   20.8   263   21.4 
2026-09-10 00:00 UT   04 53 43.0   +48 41 05     2.667    2.836   89.1   20.8   263   21.3 
2026-09-11 00:00 UT   04 54 32.0   +48 46 45     2.649    2.831   89.9   20.8   263   21.3 
2026-09-12 00:00 UT   04 55 19.7   +48 52 27     2.631    2.826   90.6   20.9   263   21.3 
2026-09-13 00:00 UT   04 56 06.0   +48 58 09     2.612    2.821   91.3   20.9   262   21.3 
2026-09-14 00:00 UT   04 56 50.9   +49 03 52     2.594    2.816   92.1   20.9   262   21.3 
2026-09-15 00:00 UT   04 57 34.3   +49 09 35     2.576    2.811   92.8   20.9   262   21.3 
2026-09-16 00:00 UT   04 58 16.2   +49 15 19     2.558    2.806   93.6   21.0   261   21.2 
2026-09-17 00:00 UT   04 58 56.6   +49 21 04     2.540    2.801   94.3   21.0   261   21.2 
2026-09-18 00:00 UT   04 59 35.4   +49 26 49     2.522    2.796   95.1   21.0   261   21.2 
2026-09-19 00:00 UT   05 00 12.6   +49 32 35     2.504    2.791   95.8   21.0   260   21.2 
2026-09-20 00:00 UT   05 00 48.1   +49 38 21     2.486    2.786   96.6   21.0   260   21.2 
2026-09-21 00:00 UT   05 01 22.0   +49 44 07     2.468    2.780   97.3   21.0   260   21.1 
2026-09-22 00:00 UT   05 01 54.1   +49 49 54     2.450    2.775   98.1   21.0   259   21.1 
2026-09-23 00:00 UT   05 02 24.5   +49 55 41     2.432    2.770   98.9   21.0   259   21.1 
2026-09-24 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 

    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.