2021 CU3
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	3 Jun 2026	29.6	4.119 AU	5.070 AU	04h06m	+06°12'	18.3°	4.4°

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 2021 CU3 are:

            e (Eccentricity)                : 0.7812542
            a (Semimajor axis)              : 2.4070240
            i (Inclination)                 : 17.83363
            Ω (Longitude of ascending node) : 144.41646
            ω (Argument of perihelion)      : 101.88643
            M (Mean anomaly)                : 85.85319
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 66.88453
            B (Latitude of perihelion)      : 17.43883
            P (Orbital period in years)     : 3.73            
        

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
2026-06-03 00:00 UT   04 06 07.5   +06 12 22     5.070    4.119   18.3    4.4   208   29.6 
2026-06-03 01:54 UT   04 06 11.8   +06 12 33     5.070    4.119   18.3    4.4   208   29.6 
2026-06-04 00:00 UT   04 07 02.9   +06 14 33     5.069    4.121   18.7    4.5   210   29.6 
2026-06-05 00:00 UT   04 07 58.3   +06 16 40     5.068    4.123   19.2    4.6   211   29.7 
2026-06-06 00:00 UT   04 08 53.5   +06 18 43     5.067    4.125   19.7    4.7   213   29.7 
2026-06-07 00:00 UT   04 09 48.7   +06 20 43     5.065    4.127   20.2    4.9   215   29.7 
2026-06-08 00:00 UT   04 10 43.8   +06 22 39     5.063    4.129   20.7    5.0   216   29.7 
2026-06-09 00:00 UT   04 11 38.7   +06 24 32     5.061    4.131   21.2    5.1   218   29.7 
2026-06-10 00:00 UT   04 12 33.6   +06 26 21     5.059    4.133   21.7    5.2   219   29.7 
2026-06-11 00:00 UT   04 13 28.3   +06 28 07     5.057    4.135   22.3    5.3   220   29.7 
2026-06-12 00:00 UT   04 14 22.9   +06 29 49     5.054    4.137   22.8    5.5   222   29.7 
2026-06-13 00:00 UT   04 15 17.4   +06 31 27     5.052    4.139   23.4    5.6   223   29.7 
2026-06-14 00:00 UT   04 16 11.7   +06 33 02     5.049    4.141   24.0    5.7   224   29.7 
2026-06-15 00:00 UT   04 17 05.8   +06 34 33     5.045    4.143   24.6    5.8   225   29.7 
2026-06-16 00:00 UT   04 17 59.9   +06 36 00     5.042    4.145   25.1    6.0   226   29.7 
2026-06-17 00:00 UT   04 18 53.7   +06 37 24     5.039    4.147   25.7    6.1   227   29.7 
2026-06-18 00:00 UT   04 19 47.4   +06 38 44     5.035    4.149   26.3    6.2   228   29.7 
2026-06-19 00:00 UT   04 20 40.9   +06 40 01     5.031    4.151   27.0    6.4   229   29.7 
2026-06-20 00:00 UT   04 21 34.2   +06 41 13     5.027    4.153   27.6    6.5   230   29.7 
2026-06-21 00:00 UT   04 22 27.4   +06 42 22     5.022    4.155   28.2    6.6   231   29.7 
2026-06-22 00:00 UT   04 23 20.3   +06 43 28     5.018    4.156   28.8    6.8   232   29.8 
2026-06-23 00:00 UT   04 24 13.1   +06 44 29     5.013    4.158   29.5    6.9   233   29.8 
2026-06-24 00:00 UT   04 25 05.6   +06 45 27     5.008    4.160   30.1    7.0   234   29.8 
2026-06-25 00:00 UT   04 25 58.0   +06 46 22     5.003    4.162   30.7    7.2   234   29.8 
2026-06-26 00:00 UT   04 26 50.1   +06 47 12     4.998    4.164   31.4    7.3   235   29.8 
2026-06-27 00:00 UT   04 27 42.0   +06 47 59     4.992    4.166   32.0    7.4   236   29.8 
2026-06-28 00:00 UT   04 28 33.7   +06 48 42     4.987    4.167   32.7    7.6   237   29.8 
2026-06-29 00:00 UT   04 29 25.1   +06 49 22     4.981    4.169   33.3    7.7   237   29.8 
2026-06-30 00:00 UT   04 30 16.3   +06 49 58     4.975    4.171   34.0    7.8   238   29.8 
2026-07-01 00:00 UT   04 31 07.3   +06 50 30     4.968    4.173   34.7    8.0   239   29.8 
2026-07-02 00:00 UT   04 31 58.0   +06 50 58     4.962    4.174   35.3    8.1   239   29.8 
2026-07-03 00:00 UT   04 32 48.5   +06 51 23     4.955    4.176   36.0    8.2   240   29.8 

    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.