2020 RA4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	4 Sep 2026	33.0	3.308 AU	4.106 AU	12h45m	-09°20'	33.2°	9.6°

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)                : 0.5578720
            a (Semimajor axis)              : 2.3287632
            i (Inclination)                 : 9.80745
            Ω (Longitude of ascending node) : 352.66023
            ω (Argument of perihelion)      : 8.81969
            M (Mean anomaly)                : 217.96110
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 1.35301
            B (Latitude of perihelion)      : 1.49657
            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
2026-09-04 00:00 UT   12 45 27.0   -09 20 08     4.106    3.308   33.2    9.6   119   33.0 
2026-09-04 11:42 UT   12 45 57.8   -09 23 31     4.108    3.307   32.9    9.5   119   33.0 
2026-09-05 00:00 UT   12 46 30.3   -09 27 04     4.111    3.305   32.5    9.4   119   33.0 
2026-09-06 00:00 UT   12 47 34.0   -09 34 03     4.116    3.302   31.8    9.3   120   33.0 
2026-09-07 00:00 UT   12 48 38.0   -09 41 04     4.120    3.299   31.2    9.1   120   33.0 
2026-09-08 00:00 UT   12 49 42.4   -09 48 06     4.125    3.296   30.5    8.9   120   33.0 
2026-09-09 00:00 UT   12 50 47.1   -09 55 11     4.129    3.293   29.8    8.7   120   33.0 
2026-09-10 00:00 UT   12 51 52.1   -10 02 17     4.133    3.290   29.1    8.6   120   33.0 
2026-09-11 00:00 UT   12 52 57.5   -10 09 26     4.137    3.287   28.5    8.4   121   32.9 
2026-09-12 00:00 UT   12 54 03.2   -10 16 36     4.141    3.284   27.8    8.2   121   32.9 
2026-09-13 00:00 UT   12 55 09.2   -10 23 48     4.145    3.281   27.1    8.0   121   32.9 
2026-09-14 00:00 UT   12 56 15.5   -10 31 02     4.148    3.278   26.5    7.9   121   32.9 
2026-09-15 00:00 UT   12 57 22.1   -10 38 17     4.151    3.275   25.8    7.7   121   32.9 
2026-09-16 00:00 UT   12 58 29.0   -10 45 34     4.154    3.272   25.1    7.5   122   32.9 
2026-09-17 00:00 UT   12 59 36.2   -10 52 53     4.157    3.269   24.5    7.3   122   32.9 
2026-09-18 00:00 UT   13 00 43.8   -11 00 13     4.160    3.266   23.8    7.1   122   32.9 
2026-09-19 00:00 UT   13 01 51.6   -11 07 35     4.163    3.263   23.2    7.0   122   32.9 
2026-09-20 00:00 UT   13 02 59.7   -11 14 58     4.165    3.260   22.5    6.8   123   32.9 
2026-09-21 00:00 UT   13 04 08.1   -11 22 22     4.167    3.257   21.9    6.6   123   32.9 
2026-09-22 00:00 UT   13 05 16.8   -11 29 48     4.169    3.253   21.2    6.4   123   32.9 
2026-09-23 00:00 UT   13 06 25.7   -11 37 16     4.171    3.250   20.5    6.2   124   32.8 
2026-09-24 00:00 UT   13 07 35.0   -11 44 44     4.173    3.247   19.9    6.0   124   32.8 
2026-09-25 00:00 UT   13 08 44.5   -11 52 14     4.174    3.244   19.2    5.8   125   32.8 
2026-09-26 00:00 UT   13 09 54.3   -11 59 45     4.175    3.241   18.6    5.7   125   32.8 
2026-09-27 00:00 UT   13 11 04.3   -12 07 18     4.176    3.237   17.9    5.5   126   32.8 
2026-09-28 00:00 UT   13 12 14.7   -12 14 51     4.177    3.234   17.3    5.3   126   32.8 
2026-09-29 00:00 UT   13 13 25.3   -12 22 26     4.178    3.231   16.7    5.1   127   32.8 
2026-09-30 00:00 UT   13 14 36.2   -12 30 02     4.179    3.228   16.0    4.9   127   32.8 
2026-10-01 00:00 UT   13 15 47.3   -12 37 39     4.179    3.224   15.4    4.7   128   32.8 
2026-10-02 00:00 UT   13 16 58.8   -12 45 17     4.179    3.221   14.7    4.5   129   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.