2019 WH4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	8 Apr 2026	34.0	3.938 AU	3.767 AU	19h06m	-20°52'	92.4°	14.7°

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)                : 0.6049320
            a (Semimajor axis)              : 2.5112688
            i (Inclination)                 : 3.53214
            Ω (Longitude of ascending node) : 243.40932
            ω (Argument of perihelion)      : 197.27505
            M (Mean anomaly)                : 177.81977
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 260.65350
            B (Latitude of perihelion)      : -1.04830
            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
2026-04-08 00:00 UT   19 06 01.9   -20 52 03     3.767    3.938   92.4   14.7   263   34.0 
2026-04-08 19:14 UT   19 06 17.7   -20 51 03     3.753    3.937   93.1   14.7   263   34.0 
2026-04-09 00:00 UT   19 06 21.5   -20 50 49     3.750    3.937   93.3   14.7   263   34.0 
2026-04-10 00:00 UT   19 06 40.1   -20 49 36     3.733    3.935   94.2   14.7   263   34.0 
2026-04-11 00:00 UT   19 06 57.8   -20 48 24     3.715    3.934   95.1   14.7   263   33.9 
2026-04-12 00:00 UT   19 07 14.5   -20 47 14     3.698    3.932   96.0   14.7   263   33.9 
2026-04-13 00:00 UT   19 07 30.2   -20 46 04     3.681    3.931   97.0   14.7   263   33.9 
2026-04-14 00:00 UT   19 07 44.9   -20 44 56     3.664    3.929   97.9   14.6   263   33.9 
2026-04-15 00:00 UT   19 07 58.6   -20 43 49     3.647    3.928   98.8   14.6   263   33.9 
2026-04-16 00:00 UT   19 08 11.3   -20 42 43     3.630    3.926   99.7   14.6   263   33.9 
2026-04-17 00:00 UT   19 08 22.9   -20 41 38     3.613    3.925  100.7   14.6   263   33.9 
2026-04-18 00:00 UT   19 08 33.4   -20 40 35     3.596    3.923  101.6   14.5   263   33.9 
2026-04-19 00:00 UT   19 08 42.9   -20 39 34     3.579    3.921  102.5   14.5   263   33.9 
2026-04-20 00:00 UT   19 08 51.3   -20 38 33     3.562    3.920  103.5   14.4   263   33.8 
2026-04-21 00:00 UT   19 08 58.7   -20 37 35     3.545    3.918  104.4   14.4   263   33.8 
2026-04-22 00:00 UT   19 09 04.9   -20 36 37     3.529    3.917  105.4   14.3   263   33.8 
2026-04-23 00:00 UT   19 09 10.1   -20 35 42     3.512    3.915  106.3   14.3   263   33.8 
2026-04-24 00:00 UT   19 09 14.2   -20 34 47     3.495    3.913  107.3   14.2   263   33.8 
2026-04-25 00:00 UT   19 09 17.1   -20 33 55     3.479    3.912  108.2   14.1   263   33.8 
2026-04-26 00:00 UT   19 09 19.0   -20 33 04     3.462    3.910  109.2   14.1   263   33.8 
2026-04-27 00:00 UT   19 09 19.7   -20 32 14     3.446    3.909  110.2   14.0   262   33.7 
2026-04-28 00:00 UT   19 09 19.2   -20 31 27     3.429    3.907  111.1   13.9   262   33.7 
2026-04-29 00:00 UT   19 09 17.7   -20 30 41     3.413    3.905  112.1   13.8   262   33.7 
2026-04-30 00:00 UT   19 09 15.0   -20 29 56     3.397    3.904  113.1   13.7   262   33.7 
2026-05-01 00:00 UT   19 09 11.1   -20 29 13     3.381    3.902  114.1   13.6   262   33.7 
2026-05-02 00:00 UT   19 09 06.1   -20 28 32     3.365    3.900  115.1   13.5   262   33.7 
2026-05-03 00:00 UT   19 08 59.9   -20 27 53     3.349    3.898  116.1   13.4   262   33.7 
2026-05-04 00:00 UT   19 08 52.5   -20 27 16     3.333    3.897  117.1   13.3   262   33.6 
2026-05-05 00:00 UT   19 08 44.0   -20 26 40     3.318    3.895  118.1   13.2   262   33.6 
2026-05-06 00:00 UT   19 08 34.2   -20 26 06     3.302    3.893  119.1   13.1   262   33.6 
2026-05-07 00:00 UT   19 08 23.3   -20 25 34     3.287    3.891  120.1   13.0   262   33.6 
2026-05-08 00:00 UT   19 08 11.2   -20 25 03     3.271    3.890  121.1   12.8   262   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.