(415029) 2011 UL21
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	18 Oct 2025	21.6	3.497 AU	2.734 AU	23h23m	+47°20'	133.6°	11.9°

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)                : 0.6536566
            a (Semimajor axis)              : 2.1225660
            i (Inclination)                 : 34.88580
            Ω (Longitude of ascending node) : 275.31631
            ω (Argument of perihelion)      : 284.98682
            M (Mean anomaly)                : 113.97504
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 203.39039
            B (Latitude of perihelion)      : -33.53788
            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
2025-10-18 00:00 UT   23 23 45.6   +47 20 20     2.734    3.497  133.6   11.9   134   21.6 
2025-10-18 10:18 UT   23 23 19.9   +47 15 36     2.735    3.497  133.5   11.9   133   21.6 
2025-10-19 00:00 UT   23 22 46.1   +47 09 15     2.737    3.497  133.5   11.9   132   21.6 
2025-10-20 00:00 UT   23 21 48.4   +46 57 58     2.739    3.498  133.3   12.0   131   21.6 
2025-10-21 00:00 UT   23 20 52.3   +46 46 30     2.742    3.499  133.1   12.0   129   21.6 
2025-10-22 00:00 UT   23 19 58.0   +46 34 52     2.745    3.499  132.9   12.0   127   21.6 
2025-10-23 00:00 UT   23 19 05.5   +46 23 05     2.748    3.500  132.6   12.1   125   21.6 
2025-10-24 00:00 UT   23 18 14.7   +46 11 08     2.752    3.500  132.4   12.1   124   21.6 
2025-10-25 00:00 UT   23 17 25.7   +45 59 03     2.756    3.501  132.1   12.2   122   21.6 
2025-10-26 00:00 UT   23 16 38.5   +45 46 50     2.760    3.501  131.8   12.2   121   21.6 
2025-10-27 00:00 UT   23 15 53.2   +45 34 29     2.764    3.502  131.5   12.3   119   21.6 
2025-10-28 00:00 UT   23 15 09.7   +45 22 03     2.768    3.502  131.1   12.3   117   21.6 
2025-10-29 00:00 UT   23 14 28.0   +45 09 30     2.773    3.503  130.7   12.4   116   21.6 
2025-10-30 00:00 UT   23 13 48.2   +44 56 51     2.778    3.503  130.3   12.5   114   21.6 
2025-10-31 00:00 UT   23 13 10.3   +44 44 08     2.783    3.504  129.9   12.5   113   21.6 
2025-11-01 00:00 UT   23 12 34.2   +44 31 21     2.788    3.504  129.5   12.6   111   21.6 
2025-11-02 00:00 UT   23 11 60.0   +44 18 30     2.794    3.505  129.1   12.7   110   21.6 
2025-11-03 00:00 UT   23 11 27.6   +44 05 36     2.799    3.505  128.6   12.8   108   21.6 
2025-11-04 00:00 UT   23 10 57.1   +43 52 39     2.805    3.505  128.1   12.9   107   21.7 
2025-11-05 00:00 UT   23 10 28.4   +43 39 41     2.811    3.506  127.6   12.9   105   21.7 
2025-11-06 00:00 UT   23 10 01.5   +43 26 41     2.818    3.506  127.1   13.0   104   21.7 
2025-11-07 00:00 UT   23 09 36.5   +43 13 40     2.824    3.506  126.6   13.1   103   21.7 
2025-11-08 00:00 UT   23 09 13.3   +43 00 38     2.831    3.507  126.1   13.2   102   21.7 
2025-11-09 00:00 UT   23 08 51.9   +42 47 37     2.838    3.507  125.5   13.3   100   21.7 
2025-11-10 00:00 UT   23 08 32.3   +42 34 36     2.845    3.507  124.9   13.4    99   21.7 
2025-11-11 00:00 UT   23 08 14.4   +42 21 36     2.852    3.508  124.4   13.5    98   21.7 
2025-11-12 00:00 UT   23 07 58.4   +42 08 37     2.860    3.508  123.8   13.6    97   21.7 
2025-11-13 00:00 UT   23 07 44.1   +41 55 40     2.868    3.508  123.2   13.7    95   21.7 
2025-11-14 00:00 UT   23 07 31.5   +41 42 46     2.876    3.508  122.5   13.8    94   21.7 
2025-11-15 00:00 UT   23 07 20.7   +41 29 54     2.884    3.509  121.9   13.8    93   21.7 
2025-11-16 00:00 UT   23 07 11.6   +41 17 06     2.892    3.509  121.3   13.9    92   21.8 
2025-11-17 00:00 UT   23 07 04.2   +41 04 21     2.900    3.509  120.6   14.0    91   21.8 

    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.