2020 RA4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	16 Oct 2026	32.7	3.207 AU	4.197 AU	13h31m	-14°13'	6.0°	1.9°

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)                : 0.5588236
            a (Semimajor axis)              : 2.3337970
            i (Inclination)                 : 9.81864
            Ω (Longitude of ascending node) : 352.65993
            ω (Argument of perihelion)      : 8.81824
            M (Mean anomaly)                : 216.09251
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 1.35099
            B (Latitude of perihelion)      : 1.49802
            P (Orbital period in years)     : 3.57            
        

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
2026-10-16 00:00 UT   13 31 32.6   -14 13 45     4.197    3.207    6.0    1.9   158   32.7 
2026-10-16 17:57 UT   13 32 28.1   -14 19 35     4.195    3.204    5.7    1.8   161   32.7 
2026-10-17 00:00 UT   13 32 46.8   -14 21 33     4.194    3.204    5.6    1.7   163   32.7 
2026-10-18 00:00 UT   13 34 01.2   -14 29 22     4.191    3.200    5.2    1.6   169   32.7 
2026-10-19 00:00 UT   13 35 15.8   -14 37 11     4.188    3.197    4.9    1.5   175   32.6 
2026-10-20 00:00 UT   13 36 30.5   -14 45 01     4.185    3.193    4.6    1.4   183   32.6 
2026-10-21 00:00 UT   13 37 45.5   -14 52 51     4.182    3.190    4.5    1.4   191   32.6 
2026-10-22 00:00 UT   13 39 00.7   -15 00 42     4.178    3.186    4.4    1.4   199   32.6 
2026-10-23 00:00 UT   13 40 16.1   -15 08 32     4.174    3.183    4.4    1.4   208   32.6 
2026-10-24 00:00 UT   13 41 31.7   -15 16 23     4.170    3.179    4.6    1.4   216   32.6 
2026-10-25 00:00 UT   13 42 47.5   -15 24 15     4.166    3.176    4.8    1.5   224   32.6 
2026-10-26 00:00 UT   13 44 03.5   -15 32 06     4.161    3.172    5.1    1.6   230   32.6 
2026-10-27 00:00 UT   13 45 19.6   -15 39 58     4.157    3.169    5.5    1.7   236   32.6 
2026-10-28 00:00 UT   13 46 36.0   -15 47 50     4.152    3.165    5.9    1.8   241   32.6 
2026-10-29 00:00 UT   13 47 52.5   -15 55 42     4.147    3.162    6.3    2.0   246   32.6 
2026-10-30 00:00 UT   13 49 09.3   -16 03 34     4.142    3.158    6.8    2.1   250   32.6 
2026-10-31 00:00 UT   13 50 26.2   -16 11 26     4.137    3.154    7.4    2.3   253   32.6 
2026-11-01 00:00 UT   13 51 43.3   -16 19 19     4.131    3.151    7.9    2.5   256   32.7 
2026-11-02 00:00 UT   13 53 00.6   -16 27 11     4.125    3.147    8.5    2.7   258   32.7 
2026-11-03 00:00 UT   13 54 18.1   -16 35 04     4.119    3.143    9.0    2.8   260   32.7 
2026-11-04 00:00 UT   13 55 35.8   -16 42 56     4.113    3.140    9.6    3.0   262   32.7 
2026-11-05 00:00 UT   13 56 53.6   -16 50 48     4.107    3.136   10.2    3.2   264   32.7 
2026-11-06 00:00 UT   13 58 11.6   -16 58 41     4.101    3.132   10.8    3.4   265   32.7 
2026-11-07 00:00 UT   13 59 29.8   -17 06 33     4.094    3.129   11.4    3.6   267   32.7 
2026-11-08 00:00 UT   14 00 48.1   -17 14 25     4.087    3.125   12.0    3.8   268   32.7 
2026-11-09 00:00 UT   14 02 06.6   -17 22 17     4.080    3.121   12.7    4.0   269   32.7 
2026-11-10 00:00 UT   14 03 25.3   -17 30 08     4.073    3.117   13.3    4.2   270   32.7 

    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.