2019 WH4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	19 Oct 2025	34.3	4.021 AU	4.701 AU	16h24m	-20°53'	42.3°	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 2019 WH4 are:

            e (Eccentricity)                : 0.6049952
            a (Semimajor axis)              : 2.5110894
            i (Inclination)                 : 3.53256
            Ω (Longitude of ascending node) : 243.41077
            ω (Argument of perihelion)      : 197.26389
            M (Mean anomaly)                : 128.31144
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 260.64380
            B (Latitude of perihelion)      : -1.04776
            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
2025-10-19 00:00 UT   16 24 46.6   -20 53 33     4.701    4.021   42.3    9.6    98   34.3 
2025-10-19 17:51 UT   16 25 28.9   -20 55 03     4.709    4.021   41.8    9.5    98   34.3 
2025-10-20 00:00 UT   16 25 43.6   -20 55 34     4.711    4.021   41.6    9.5    98   34.3 
2025-10-21 00:00 UT   16 26 40.9   -20 57 35     4.722    4.022   40.8    9.3    98   34.3 
2025-10-22 00:00 UT   16 27 38.6   -20 59 34     4.733    4.022   40.0    9.2    98   34.3 
2025-10-23 00:00 UT   16 28 36.7   -21 01 33     4.743    4.022   39.3    9.0    98   34.3 
2025-10-24 00:00 UT   16 29 35.1   -21 03 32     4.753    4.023   38.5    8.9    98   34.3 
2025-10-25 00:00 UT   16 30 33.8   -21 05 30     4.763    4.023   37.7    8.7    98   34.3 
2025-10-26 00:00 UT   16 31 32.9   -21 07 27     4.773    4.024   37.0    8.5    98   34.3 
2025-10-27 00:00 UT   16 32 32.3   -21 09 23     4.783    4.024   36.2    8.4    97   34.3 
2025-10-28 00:00 UT   16 33 32.0   -21 11 19     4.792    4.024   35.4    8.2    97   34.3 
2025-10-29 00:00 UT   16 34 32.1   -21 13 14     4.802    4.025   34.7    8.1    97   34.3 
2025-10-30 00:00 UT   16 35 32.4   -21 15 08     4.811    4.025   33.9    7.9    97   34.3 
2025-10-31 00:00 UT   16 36 33.0   -21 17 01     4.820    4.025   33.2    7.8    97   34.3 
2025-11-01 00:00 UT   16 37 34.0   -21 18 53     4.829    4.026   32.4    7.6    97   34.3 
2025-11-02 00:00 UT   16 38 35.2   -21 20 44     4.837    4.026   31.6    7.4    97   34.3 
2025-11-03 00:00 UT   16 39 36.7   -21 22 34     4.845    4.026   30.9    7.3    97   34.3 
2025-11-04 00:00 UT   16 40 38.4   -21 24 23     4.854    4.027   30.1    7.1    96   34.3 
2025-11-05 00:00 UT   16 41 40.4   -21 26 11     4.862    4.027   29.4    6.9    96   34.3 
2025-11-06 00:00 UT   16 42 42.7   -21 27 58     4.869    4.027   28.6    6.8    96   34.3 
2025-11-07 00:00 UT   16 43 45.2   -21 29 43     4.877    4.027   27.8    6.6    96   34.3 
2025-11-08 00:00 UT   16 44 48.0   -21 31 28     4.884    4.028   27.1    6.4    96   34.3 
2025-11-09 00:00 UT   16 45 51.0   -21 33 11     4.892    4.028   26.3    6.3    96   34.3 
2025-11-10 00:00 UT   16 46 54.3   -21 34 53     4.899    4.028   25.6    6.1    96   34.3 
2025-11-11 00:00 UT   16 47 57.8   -21 36 34     4.906    4.028   24.8    5.9    95   34.2 
2025-11-12 00:00 UT   16 49 01.5   -21 38 14     4.912    4.029   24.1    5.7    95   34.2 
2025-11-13 00:00 UT   16 50 05.5   -21 39 52     4.919    4.029   23.3    5.6    95   34.2 
2025-11-14 00:00 UT   16 51 09.7   -21 41 29     4.925    4.029   22.5    5.4    95   34.2 
2025-11-15 00:00 UT   16 52 14.0   -21 43 04     4.931    4.029   21.8    5.2    95   34.2 
2025-11-16 00:00 UT   16 53 18.6   -21 44 38     4.937    4.029   21.0    5.1    94   34.2 
2025-11-17 00:00 UT   16 54 23.4   -21 46 11     4.942    4.029   20.3    4.9    94   34.2 
2025-11-18 00:00 UT   16 55 28.4   -21 47 42     4.948    4.030   19.5    4.7    94   34.2 

    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.