2021 CU3
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	2 Nov 2025	27.7	3.339 AU	2.413 AU	03h15m	-07°25'	155.0°	7.2°

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
2025-11-02 00:00 UT   03 15 41.1   -07 25 01     2.413    3.339  155.0    7.2   332   27.7 
2025-11-02 19:17 UT   03 14 46.2   -07 29 08     2.417    3.344  155.2    7.2   334   27.7 
2025-11-03 00:00 UT   03 14 32.7   -07 30 07     2.418    3.345  155.2    7.1   335   27.7 
2025-11-04 00:00 UT   03 13 24.3   -07 35 02     2.423    3.350  155.4    7.1   338   27.7 
2025-11-05 00:00 UT   03 12 15.8   -07 39 45     2.428    3.355  155.4    7.1   341   27.7 
2025-11-06 00:00 UT   03 11 07.4   -07 44 17     2.434    3.361  155.5    7.0   344   27.7 
2025-11-07 00:00 UT   03 09 59.2   -07 48 37     2.439    3.366  155.4    7.0   347   27.7 
2025-11-08 00:00 UT   03 08 51.0   -07 52 45     2.446    3.371  155.3    7.1   350   27.8 
2025-11-09 00:00 UT   03 07 43.1   -07 56 41     2.452    3.377  155.1    7.1   353   27.8 
2025-11-10 00:00 UT   03 06 35.5   -08 00 25     2.459    3.382  154.9    7.1   356   27.8 
2025-11-11 00:00 UT   03 05 28.1   -08 03 56     2.466    3.387  154.6    7.2   359   27.8 
2025-11-12 00:00 UT   03 04 21.1   -08 07 16     2.473    3.392  154.3    7.3     2   27.8 
2025-11-13 00:00 UT   03 03 14.6   -08 10 22     2.481    3.398  153.9    7.4     5   27.8 
2025-11-14 00:00 UT   03 02 08.4   -08 13 16     2.489    3.403  153.4    7.5     8   27.8 
2025-11-15 00:00 UT   03 01 02.8   -08 15 58     2.497    3.408  152.9    7.6    10   27.8 
2025-11-16 00:00 UT   02 59 57.7   -08 18 27     2.506    3.413  152.4    7.7    13   27.9 
2025-11-17 00:00 UT   02 58 53.3   -08 20 43     2.515    3.418  151.8    7.9    15   27.9 
2025-11-18 00:00 UT   02 57 49.5   -08 22 46     2.524    3.424  151.2    8.0    17   27.9 
2025-11-19 00:00 UT   02 56 46.3   -08 24 37     2.534    3.429  150.5    8.2    20   27.9 
2025-11-20 00:00 UT   02 55 43.9   -08 26 16     2.543    3.434  149.8    8.3    22   27.9 
2025-11-21 00:00 UT   02 54 42.3   -08 27 41     2.553    3.439  149.1    8.5    24   28.0 
2025-11-22 00:00 UT   02 53 41.5   -08 28 54     2.564    3.444  148.3    8.7    26   28.0 
2025-11-23 00:00 UT   02 52 41.6   -08 29 55     2.574    3.449  147.6    8.8    27   28.0 
2025-11-24 00:00 UT   02 51 42.5   -08 30 43     2.585    3.454  146.7    9.0    29   28.0 
2025-11-25 00:00 UT   02 50 44.4   -08 31 19     2.597    3.459  145.9    9.2    31   28.0 
2025-11-26 00:00 UT   02 49 47.2   -08 31 43     2.608    3.464  145.1    9.4    32   28.1 
2025-11-27 00:00 UT   02 48 51.1   -08 31 54     2.620    3.469  144.2    9.6    34   28.1 
2025-11-28 00:00 UT   02 47 55.9   -08 31 54     2.632    3.474  143.4    9.8    35   28.1 
2025-11-29 00:00 UT   02 47 01.9   -08 31 42     2.644    3.479  142.5    9.9    37   28.1 
2025-11-30 00:00 UT   02 46 08.9   -08 31 18     2.657    3.484  141.6   10.1    38   28.1 
2025-12-01 00:00 UT   02 45 17.0   -08 30 43     2.669    3.489  140.7   10.3    39   28.2 
2025-12-02 00:00 UT   02 44 26.2   -08 29 57     2.682    3.493  139.7   10.5    41   28.2 

    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.