2021 CQ4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	30 Sep 2026	31.3	3.057 AU	2.936 AU	18h16m	-25°11'	87.3°	19.1°

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)                : 0.6298097
            a (Semimajor axis)              : 2.8399609
            i (Inclination)                 : 2.01820
            Ω (Longitude of ascending node) : 352.40401
            ω (Argument of perihelion)      : 166.22696
            M (Mean anomaly)                : 37.86993
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 338.63919
            B (Latitude of perihelion)      : 0.48039
            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
2026-09-30 00:00 UT   18 16 40.9   -25 11 44     2.936    3.057   87.3   19.1    88   31.3 
2026-09-30 00:43 UT   18 16 42.4   -25 11 42     2.936    3.057   87.3   19.1    88   31.3 
2026-10-01 00:00 UT   18 17 32.9   -25 10 41     2.956    3.063   86.5   19.0    88   31.3 
2026-10-02 00:00 UT   18 18 25.6   -25 09 38     2.976    3.069   85.7   19.0    88   31.3 
2026-10-03 00:00 UT   18 19 19.0   -25 08 34     2.996    3.074   84.9   18.9    88   31.3 
2026-10-04 00:00 UT   18 20 13.1   -25 07 28     3.017    3.080   84.2   18.9    88   31.4 
2026-10-05 00:00 UT   18 21 07.9   -25 06 22     3.037    3.086   83.4   18.8    88   31.4 
2026-10-06 00:00 UT   18 22 03.3   -25 05 15     3.057    3.092   82.6   18.7    88   31.4 
2026-10-07 00:00 UT   18 22 59.5   -25 04 07     3.077    3.098   81.8   18.6    88   31.4 
2026-10-08 00:00 UT   18 23 56.2   -25 02 57     3.098    3.104   81.1   18.5    88   31.4 
2026-10-09 00:00 UT   18 24 53.6   -25 01 47     3.118    3.110   80.3   18.5    88   31.4 
2026-10-10 00:00 UT   18 25 51.6   -25 00 35     3.138    3.115   79.5   18.4    88   31.5 
2026-10-11 00:00 UT   18 26 50.2   -24 59 22     3.158    3.121   78.8   18.3    88   31.5 
2026-10-12 00:00 UT   18 27 49.5   -24 58 08     3.178    3.127   78.0   18.2    88   31.5 
2026-10-13 00:00 UT   18 28 49.2   -24 56 53     3.198    3.133   77.2   18.1    88   31.5 
2026-10-14 00:00 UT   18 29 49.6   -24 55 36     3.218    3.138   76.5   18.0    87   31.5 
2026-10-15 00:00 UT   18 30 50.5   -24 54 17     3.238    3.144   75.7   17.9    87   31.5 
2026-10-16 00:00 UT   18 31 51.9   -24 52 58     3.258    3.150   75.0   17.8    87   31.5 
2026-10-17 00:00 UT   18 32 53.9   -24 51 37     3.278    3.156   74.2   17.7    87   31.6 
2026-10-18 00:00 UT   18 33 56.3   -24 50 14     3.297    3.161   73.4   17.6    87   31.6 
2026-10-19 00:00 UT   18 34 59.3   -24 48 50     3.317    3.167   72.7   17.5    87   31.6 
2026-10-20 00:00 UT   18 36 02.7   -24 47 24     3.337    3.173   71.9   17.4    87   31.6 
2026-10-21 00:00 UT   18 37 06.7   -24 45 57     3.356    3.178   71.2   17.3    87   31.6 
2026-10-22 00:00 UT   18 38 11.0   -24 44 28     3.376    3.184   70.4   17.1    87   31.6 
2026-10-23 00:00 UT   18 39 15.8   -24 42 58     3.395    3.189   69.7   17.0    87   31.6 
2026-10-24 00:00 UT   18 40 21.1   -24 41 26     3.414    3.195   68.9   16.9    87   31.6 
2026-10-25 00:00 UT   18 41 26.8   -24 39 52     3.434    3.201   68.2   16.8    87   31.7 
2026-10-26 00:00 UT   18 42 32.8   -24 38 17     3.453    3.206   67.5   16.6    86   31.7 
2026-10-27 00:00 UT   18 43 39.3   -24 36 39     3.472    3.212   66.7   16.5    86   31.7 
2026-10-28 00:00 UT   18 44 46.2   -24 35 00     3.491    3.217   66.0   16.4    86   31.7 
2026-10-29 00:00 UT   18 45 53.4   -24 33 20     3.510    3.223   65.2   16.3    86   31.7 
2026-10-30 00:00 UT   18 47 01.1   -24 31 37     3.529    3.228   64.5   16.1    86   31.7 

    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.