2019 WH4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	6 Oct 2026	33.6	3.484 AU	3.550 AU	18h02m	-21°03'	78.1°	16.3°

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
2026-10-06 00:00 UT   18 02 01.1   -21 03 21     3.550    3.484   78.1   16.3    89   33.6 
2026-10-06 00:29 UT   18 02 01.8   -21 03 21     3.550    3.484   78.1   16.3    89   33.6 
2026-10-07 00:00 UT   18 02 38.0   -21 03 39     3.562    3.480   77.3   16.3    89   33.6 
2026-10-08 00:00 UT   18 03 15.8   -21 03 57     3.573    3.477   76.4   16.2    89   33.6 
2026-10-09 00:00 UT   18 03 54.6   -21 04 13     3.585    3.473   75.6   16.2    89   33.6 
2026-10-10 00:00 UT   18 04 34.3   -21 04 29     3.596    3.469   74.7   16.1    89   33.7 
2026-10-11 00:00 UT   18 05 14.9   -21 04 44     3.607    3.466   73.9   16.1    89   33.7 
2026-10-12 00:00 UT   18 05 56.3   -21 04 57     3.618    3.462   73.1   16.0    89   33.7 
2026-10-13 00:00 UT   18 06 38.7   -21 05 10     3.629    3.458   72.3   16.0    89   33.7 
2026-10-14 00:00 UT   18 07 21.9   -21 05 21     3.640    3.455   71.4   15.9    88   33.7 
2026-10-15 00:00 UT   18 08 06.0   -21 05 32     3.651    3.451   70.6   15.8    88   33.7 
2026-10-16 00:00 UT   18 08 50.9   -21 05 41     3.662    3.447   69.8   15.8    88   33.7 
2026-10-17 00:00 UT   18 09 36.6   -21 05 48     3.673    3.443   69.0   15.7    88   33.7 
2026-10-18 00:00 UT   18 10 23.2   -21 05 55     3.683    3.439   68.2   15.6    88   33.7 
2026-10-19 00:00 UT   18 11 10.6   -21 05 60     3.694    3.436   67.4   15.5    88   33.7 
2026-10-20 00:00 UT   18 11 58.8   -21 06 03     3.704    3.432   66.6   15.4    88   33.7 
2026-10-21 00:00 UT   18 12 47.7   -21 06 06     3.714    3.428   65.8   15.4    88   33.7 
2026-10-22 00:00 UT   18 13 37.5   -21 06 06     3.725    3.424   65.0   15.3    88   33.7 
2026-10-23 00:00 UT   18 14 28.0   -21 06 05     3.735    3.420   64.2   15.2    87   33.7 
2026-10-24 00:00 UT   18 15 19.3   -21 06 03     3.745    3.416   63.4   15.1    87   33.7 
2026-10-25 00:00 UT   18 16 11.3   -21 05 59     3.754    3.413   62.6   15.0    87   33.7 
2026-10-26 00:00 UT   18 17 04.0   -21 05 53     3.764    3.409   61.8   14.9    87   33.7 
2026-10-27 00:00 UT   18 17 57.5   -21 05 46     3.774    3.405   61.0   14.8    87   33.7 
2026-10-28 00:00 UT   18 18 51.7   -21 05 36     3.783    3.401   60.2   14.7    87   33.7 
2026-10-29 00:00 UT   18 19 46.5   -21 05 26     3.793    3.397   59.4   14.6    87   33.7 
2026-10-30 00:00 UT   18 20 42.1   -21 05 13     3.802    3.393   58.7   14.5    87   33.7 
2026-10-31 00:00 UT   18 21 38.4   -21 04 58     3.811    3.389   57.9   14.4    86   33.7 
2026-11-01 00:00 UT   18 22 35.4   -21 04 41     3.820    3.385   57.1   14.3    86   33.7 
2026-11-02 00:00 UT   18 23 33.0   -21 04 23     3.829    3.381   56.3   14.1    86   33.7 
2026-11-03 00:00 UT   18 24 31.3   -21 04 02     3.838    3.377   55.5   14.0    86   33.7 
2026-11-04 00:00 UT   18 25 30.3   -21 03 40     3.846    3.373   54.8   13.9    86   33.7 
2026-11-05 00:00 UT   18 26 29.9   -21 03 15     3.855    3.369   54.0   13.8    86   33.7 

    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.