2020 RA4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	4 Dec 2025	33.3	3.612 AU	3.981 AU	12h37m	-04°43'	61.2°	13.8°

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 2020 RA4 are:

            e (Eccentricity)                : 0.5578840
            a (Semimajor axis)              : 2.3287101
            i (Inclination)                 : 9.80770
            Ω (Longitude of ascending node) : 352.66060
            ω (Argument of perihelion)      : 8.83015
            M (Mean anomaly)                : 162.46033
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 1.36369
            B (Latitude of perihelion)      : 1.49837
            P (Orbital period in years)     : 3.55            
        

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
2025-12-04 00:00 UT   12 37 35.2   -04 43 40     3.981    3.612   61.2   13.8   293   33.3 
2025-12-04 05:25 UT   12 37 44.9   -04 44 57     3.978    3.612   61.4   13.9   293   33.3 
2025-12-05 00:00 UT   12 38 17.6   -04 49 17     3.968    3.613   62.0   13.9   293   33.3 
2025-12-06 00:00 UT   12 38 59.5   -04 54 51     3.955    3.613   62.9   14.0   293   33.3 
2025-12-07 00:00 UT   12 39 40.8   -05 00 21     3.941    3.614   63.7   14.1   293   33.3 
2025-12-08 00:00 UT   12 40 21.5   -05 05 49     3.927    3.614   64.5   14.2   293   33.3 
2025-12-09 00:00 UT   12 41 01.7   -05 11 13     3.913    3.615   65.3   14.3   293   33.3 
2025-12-10 00:00 UT   12 41 41.2   -05 16 33     3.899    3.616   66.2   14.4   293   33.3 
2025-12-11 00:00 UT   12 42 20.2   -05 21 50     3.885    3.616   67.0   14.5   293   33.3 
2025-12-12 00:00 UT   12 42 58.6   -05 27 04     3.871    3.617   67.8   14.6   293   33.3 
2025-12-13 00:00 UT   12 43 36.3   -05 32 14     3.857    3.617   68.7   14.7   293   33.2 
2025-12-14 00:00 UT   12 44 13.4   -05 37 21     3.843    3.618   69.5   14.8   293   33.2 
2025-12-15 00:00 UT   12 44 49.9   -05 42 24     3.828    3.618   70.4   14.8   293   33.2 
2025-12-16 00:00 UT   12 45 25.7   -05 47 23     3.814    3.619   71.2   14.9   293   33.2 
2025-12-17 00:00 UT   12 46 00.9   -05 52 18     3.799    3.619   72.1   15.0   293   33.2 
2025-12-18 00:00 UT   12 46 35.4   -05 57 10     3.784    3.620   72.9   15.1   293   33.2 
2025-12-19 00:00 UT   12 47 09.1   -06 01 58     3.770    3.620   73.8   15.1   293   33.2 
2025-12-20 00:00 UT   12 47 42.2   -06 06 41     3.755    3.621   74.6   15.2   293   33.2 
2025-12-21 00:00 UT   12 48 14.6   -06 11 21     3.740    3.621   75.5   15.3   293   33.2 
2025-12-22 00:00 UT   12 48 46.2   -06 15 56     3.725    3.621   76.4   15.3   293   33.2 
2025-12-23 00:00 UT   12 49 17.1   -06 20 28     3.710    3.622   77.2   15.4   293   33.2 
2025-12-24 00:00 UT   12 49 47.2   -06 24 55     3.694    3.622   78.1   15.4   293   33.2 
2025-12-25 00:00 UT   12 50 16.6   -06 29 18     3.679    3.622   79.0   15.5   293   33.2 
2025-12-26 00:00 UT   12 50 45.2   -06 33 36     3.664    3.623   79.9   15.5   293   33.2 
2025-12-27 00:00 UT   12 51 13.0   -06 37 51     3.649    3.623   80.8   15.5   293   33.2 
2025-12-28 00:00 UT   12 51 40.0   -06 42 00     3.633    3.624   81.6   15.6   293   33.2 
2025-12-29 00:00 UT   12 52 06.2   -06 46 06     3.618    3.624   82.5   15.6   293   33.1 
2025-12-30 00:00 UT   12 52 31.5   -06 50 06     3.602    3.624   83.4   15.6   293   33.1 
2025-12-31 00:00 UT   12 52 56.1   -06 54 03     3.587    3.624   84.3   15.7   293   33.1 
2026-01-01 00:00 UT   12 53 19.8   -06 57 54     3.571    3.625   85.2   15.7   293   33.1 
2026-01-02 00:00 UT   12 53 42.6   -07 01 41     3.556    3.625   86.1   15.7   293   33.1 
2026-01-03 00:00 UT   12 54 04.6   -07 05 23     3.540    3.625   87.1   15.7   293   33.1 

    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.