2019 WH4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	5 Sep 2026	33.4	3.590 AU	3.180 AU	17h51m	-20°50'	105.9°	15.7°

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 2019 WH4 are:

            e (Eccentricity)                : 0.6048183
            a (Semimajor axis)              : 2.5113870
            i (Inclination)                 : 3.53134
            Ω (Longitude of ascending node) : 243.40320
            ω (Argument of perihelion)      : 197.28680
            M (Mean anomaly)                : 227.32716
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 260.65913
            B (Latitude of perihelion)      : -1.04875
            P (Orbital period in years)     : 3.98            
        

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
2026-09-05 00:00 UT   17 51 36.0   -20 50 38     3.180    3.590  105.9   15.7    92   33.4 
2026-09-05 23:57 UT   17 51 38.9   -20 51 03     3.192    3.587  105.0   15.8    92   33.5 
2026-09-06 00:00 UT   17 51 38.9   -20 51 03     3.192    3.587  105.0   15.8    92   33.5 
2026-09-07 00:00 UT   17 51 42.9   -20 51 28     3.204    3.584  104.0   15.8    91   33.5 
2026-09-08 00:00 UT   17 51 48.3   -20 51 53     3.216    3.581  103.1   15.9    91   33.5 
2026-09-09 00:00 UT   17 51 54.8   -20 52 19     3.228    3.577  102.1   16.0    91   33.5 
2026-09-10 00:00 UT   17 52 02.6   -20 52 45     3.240    3.574  101.2   16.0    91   33.5 
2026-09-11 00:00 UT   17 52 11.6   -20 53 11     3.252    3.571  100.2   16.1    91   33.5 
2026-09-12 00:00 UT   17 52 21.8   -20 53 37     3.264    3.568   99.3   16.2    91   33.5 
2026-09-13 00:00 UT   17 52 33.2   -20 54 03     3.276    3.564   98.4   16.2    91   33.5 
2026-09-14 00:00 UT   17 52 45.8   -20 54 29     3.288    3.561   97.5   16.3    91   33.5 
2026-09-15 00:00 UT   17 52 59.5   -20 54 56     3.300    3.557   96.5   16.3    91   33.5 
2026-09-16 00:00 UT   17 53 14.5   -20 55 22     3.312    3.554   95.6   16.4    91   33.5 
2026-09-17 00:00 UT   17 53 30.5   -20 55 49     3.324    3.551   94.7   16.4    91   33.5 
2026-09-18 00:00 UT   17 53 47.8   -20 56 15     3.336    3.547   93.8   16.4    91   33.5 
2026-09-19 00:00 UT   17 54 06.2   -20 56 41     3.348    3.544   92.9   16.4    91   33.6 
2026-09-20 00:00 UT   17 54 25.7   -20 57 08     3.360    3.541   92.0   16.5    91   33.6 
2026-09-21 00:00 UT   17 54 46.3   -20 57 34     3.372    3.537   91.1   16.5    91   33.6 
2026-09-22 00:00 UT   17 55 08.0   -20 57 59     3.384    3.534   90.2   16.5    90   33.6 
2026-09-23 00:00 UT   17 55 30.8   -20 58 25     3.396    3.530   89.3   16.5    90   33.6 
2026-09-24 00:00 UT   17 55 54.6   -20 58 50     3.408    3.527   88.4   16.5    90   33.6 
2026-09-25 00:00 UT   17 56 19.6   -20 59 16     3.420    3.523   87.6   16.5    90   33.6 
2026-09-26 00:00 UT   17 56 45.6   -20 59 40     3.432    3.520   86.7   16.5    90   33.6 
2026-09-27 00:00 UT   17 57 12.6   -21 00 05     3.444    3.516   85.8   16.5    90   33.6 
2026-09-28 00:00 UT   17 57 40.7   -21 00 29     3.456    3.513   84.9   16.5    90   33.6 
2026-09-29 00:00 UT   17 58 09.8   -21 00 52     3.468    3.509   84.1   16.5    90   33.6 
2026-09-30 00:00 UT   17 58 39.8   -21 01 15     3.480    3.506   83.2   16.5    90   33.6 
2026-10-01 00:00 UT   17 59 10.9   -21 01 38     3.492    3.502   82.3   16.5    90   33.6 
2026-10-02 00:00 UT   17 59 43.0   -21 01 60     3.504    3.498   81.5   16.4    90   33.6 
2026-10-03 00:00 UT   18 00 16.1   -21 02 21     3.515    3.495   80.6   16.4    90   33.6 
2026-10-04 00:00 UT   18 00 50.1   -21 02 42     3.527    3.491   79.8   16.4    89   33.6 
2026-10-05 00:00 UT   18 01 25.1   -21 03 02     3.539    3.488   78.9   16.3    89   33.6 

    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.