2021 CQ4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	2 May 2026	29.0	1.997 AU	1.392 AU	19h26m	-24°52'	111.6°	28.0°

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
2026-05-02 00:00 UT   19 26 51.7   -24 52 01     1.392    1.997  111.6   28.0   263   29.0 
2026-05-02 23:14 UT   19 26 52.5   -24 53 07     1.389    2.004  112.5   27.7   263   29.0 
2026-05-03 00:00 UT   19 26 52.5   -24 53 09     1.389    2.005  112.5   27.7   263   29.0 
2026-05-04 00:00 UT   19 26 50.8   -24 54 23     1.385    2.013  113.5   27.3   263   29.0 
2026-05-05 00:00 UT   19 26 46.6   -24 55 40     1.382    2.021  114.5   27.0   263   29.0 
2026-05-06 00:00 UT   19 26 39.8   -24 57 03     1.379    2.029  115.5   26.7   263   29.0 
2026-05-07 00:00 UT   19 26 30.5   -24 58 30     1.375    2.037  116.5   26.3   263   29.0 
2026-05-08 00:00 UT   19 26 18.6   -25 00 01     1.372    2.045  117.5   26.0   263   29.0 
2026-05-09 00:00 UT   19 26 04.1   -25 01 37     1.369    2.053  118.5   25.6   263   29.0 
2026-05-10 00:00 UT   19 25 47.1   -25 03 17     1.366    2.061  119.6   25.2   263   29.0 
2026-05-11 00:00 UT   19 25 27.6   -25 05 02     1.363    2.069  120.6   24.8   263   29.0 
2026-05-12 00:00 UT   19 25 05.4   -25 06 51     1.360    2.077  121.7   24.5   264   29.0 
2026-05-13 00:00 UT   19 24 40.8   -25 08 43     1.357    2.085  122.7   24.1   264   28.9 
2026-05-14 00:00 UT   19 24 13.6   -25 10 40     1.354    2.093  123.8   23.7   264   28.9 
2026-05-15 00:00 UT   19 23 43.8   -25 12 40     1.352    2.100  124.9   23.3   264   28.9 
2026-05-16 00:00 UT   19 23 11.6   -25 14 43     1.349    2.108  126.0   22.8   264   28.9 
2026-05-17 00:00 UT   19 22 36.8   -25 16 50     1.347    2.116  127.1   22.4   264   28.9 
2026-05-18 00:00 UT   19 21 59.6   -25 18 60     1.345    2.124  128.2   22.0   264   28.9 
2026-05-19 00:00 UT   19 21 19.9   -25 21 13     1.343    2.132  129.3   21.5   265   28.9 
2026-05-20 00:00 UT   19 20 37.9   -25 23 28     1.341    2.140  130.4   21.1   265   28.9 
2026-05-21 00:00 UT   19 19 53.4   -25 25 45     1.339    2.148  131.5   20.7   265   28.9 
2026-05-22 00:00 UT   19 19 06.6   -25 28 05     1.337    2.156  132.7   20.2   265   28.9 
2026-05-23 00:00 UT   19 18 17.5   -25 30 27     1.335    2.163  133.8   19.7   265   28.9 
2026-05-24 00:00 UT   19 17 26.1   -25 32 50     1.334    2.171  135.0   19.3   266   28.8 
2026-05-25 00:00 UT   19 16 32.5   -25 35 14     1.333    2.179  136.1   18.8   266   28.8 
2026-05-26 00:00 UT   19 15 36.8   -25 37 39     1.332    2.187  137.3   18.3   266   28.8 
2026-05-27 00:00 UT   19 14 38.9   -25 40 05     1.331    2.195  138.5   17.8   266   28.8 
2026-05-28 00:00 UT   19 13 39.0   -25 42 31     1.330    2.202  139.7   17.3   267   28.8 
2026-05-29 00:00 UT   19 12 37.0   -25 44 57     1.329    2.210  140.8   16.8   267   28.8 
2026-05-30 00:00 UT   19 11 33.1   -25 47 22     1.329    2.218  142.0   16.3   267   28.8 
2026-05-31 00:00 UT   19 10 27.3   -25 49 48     1.329    2.225  143.2   15.8   268   28.8 
2026-06-01 00:00 UT   19 09 19.7   -25 52 12     1.329    2.233  144.5   15.3   268   28.8 

    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.