2021 CQ4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	1 Jun 2026	28.8	2.233 AU	1.329 AU	19h09m	-25°52'	144.5°	15.3°

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 CQ4 are:

            e (Eccentricity)                : 0.6298012
            a (Semimajor axis)              : 2.8397283
            i (Inclination)                 : 2.01822
            Ω (Longitude of ascending node) : 352.40634
            ω (Argument of perihelion)      : 166.21700
            M (Mean anomaly)                : 356.68342
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 338.63156
            B (Latitude of perihelion)      : 0.48074
            P (Orbital period in years)     : 4.79            
        

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
2026-06-01 00:00 UT   19 09 19.7   -25 52 12     1.329    2.233  144.5   15.3   268   28.8 
2026-06-01 22:53 UT   19 08 13.6   -25 54 28     1.329    2.240  145.6   14.8   268   28.8 
2026-06-02 00:00 UT   19 08 10.3   -25 54 35     1.329    2.241  145.7   14.8   268   28.8 
2026-06-03 00:00 UT   19 06 59.2   -25 56 57     1.330    2.249  146.9   14.3   269   28.7 
2026-06-04 00:00 UT   19 05 46.5   -25 59 16     1.330    2.256  148.1   13.7   269   28.7 
2026-06-05 00:00 UT   19 04 32.2   -26 01 34     1.331    2.264  149.3   13.2   269   28.7 
2026-06-06 00:00 UT   19 03 16.4   -26 03 49     1.332    2.271  150.6   12.7   270   28.7 
2026-06-07 00:00 UT   19 01 59.3   -26 06 02     1.334    2.279  151.8   12.1   270   28.7 
2026-06-08 00:00 UT   19 00 40.8   -26 08 12     1.335    2.287  153.1   11.6   271   28.7 
2026-06-09 00:00 UT   18 59 21.1   -26 10 18     1.337    2.294  154.3   11.1   271   28.7 
2026-06-10 00:00 UT   18 58 00.3   -26 12 21     1.339    2.302  155.6   10.5   272   28.7 
2026-06-11 00:00 UT   18 56 38.4   -26 14 20     1.341    2.309  156.8   10.0   272   28.7 
2026-06-12 00:00 UT   18 55 15.5   -26 16 15     1.344    2.317  158.1    9.4   273   28.6 
2026-06-13 00:00 UT   18 53 51.8   -26 18 06     1.347    2.324  159.3    8.9   274   28.6 
2026-06-14 00:00 UT   18 52 27.4   -26 19 53     1.350    2.332  160.6    8.3   275   28.6 
2026-06-15 00:00 UT   18 51 02.3   -26 21 35     1.353    2.339  161.8    7.8   275   28.6 
2026-06-16 00:00 UT   18 49 36.6   -26 23 12     1.356    2.347  163.1    7.2   276   28.6 
2026-06-17 00:00 UT   18 48 10.6   -26 24 44     1.360    2.354  164.3    6.7   278   28.6 
2026-06-18 00:00 UT   18 46 44.2   -26 26 11     1.364    2.362  165.6    6.2   279   28.6 
2026-06-19 00:00 UT   18 45 17.5   -26 27 32     1.369    2.369  166.8    5.6   280   28.6 
2026-06-20 00:00 UT   18 43 50.8   -26 28 48     1.373    2.377  168.0    5.1   282   28.6 
2026-06-21 00:00 UT   18 42 24.0   -26 29 59     1.378    2.384  169.3    4.6   284   28.5 
2026-06-22 00:00 UT   18 40 57.4   -26 31 04     1.383    2.392  170.5    4.0   287   28.5 
2026-06-23 00:00 UT   18 39 30.9   -26 32 03     1.389    2.399  171.6    3.5   290   28.5 
2026-06-24 00:00 UT   18 38 04.7   -26 32 57     1.395    2.406  172.8    3.0   294   28.5 
2026-06-25 00:00 UT   18 36 38.9   -26 33 45     1.401    2.414  173.9    2.6   300   28.5 
2026-06-26 00:00 UT   18 35 13.5   -26 34 27     1.407    2.421  174.9    2.1   308   28.5 
2026-06-27 00:00 UT   18 33 48.8   -26 35 04     1.413    2.428  175.8    1.8   320   28.5 
2026-06-28 00:00 UT   18 32 24.7   -26 35 35     1.420    2.436  176.4    1.5   336   28.5 

    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.