2019 WH4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	23 Jan 2026	34.3	4.014 AU	4.830 AU	18h08m	-22°21'	30.7°	7.2°

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
2026-01-23 00:00 UT   18 08 35.0   -22 21 06     4.830    4.014   30.7    7.2   271   34.3 
2026-01-23 16:58 UT   18 09 19.6   -22 20 43     4.823    4.014   31.2    7.3   271   34.3 
2026-01-24 00:00 UT   18 09 38.0   -22 20 33     4.821    4.014   31.4    7.3   271   34.3 
2026-01-25 00:00 UT   18 10 40.8   -22 19 57     4.812    4.013   32.2    7.5   271   34.3 
2026-01-26 00:00 UT   18 11 43.2   -22 19 20     4.802    4.012   33.0    7.7   271   34.3 
2026-01-27 00:00 UT   18 12 45.4   -22 18 42     4.793    4.012   33.8    7.8   270   34.3 
2026-01-28 00:00 UT   18 13 47.3   -22 18 01     4.783    4.011   34.5    8.0   270   34.3 
2026-01-29 00:00 UT   18 14 49.0   -22 17 19     4.774    4.010   35.3    8.2   270   34.3 
2026-01-30 00:00 UT   18 15 50.3   -22 16 35     4.764    4.010   36.1    8.3   270   34.3 
2026-01-31 00:00 UT   18 16 51.3   -22 15 50     4.753    4.009   36.9    8.5   270   34.3 
2026-02-01 00:00 UT   18 17 52.0   -22 15 03     4.743    4.008   37.6    8.6   270   34.3 
2026-02-02 00:00 UT   18 18 52.4   -22 14 15     4.733    4.008   38.4    8.8   270   34.3 
2026-02-03 00:00 UT   18 19 52.4   -22 13 25     4.722    4.007   39.2    8.9   269   34.3 
2026-02-04 00:00 UT   18 20 52.2   -22 12 33     4.711    4.006   40.0    9.1   269   34.3 
2026-02-05 00:00 UT   18 21 51.6   -22 11 40     4.700    4.006   40.8    9.2   269   34.3 
2026-02-06 00:00 UT   18 22 50.6   -22 10 46     4.689    4.005   41.6    9.4   269   34.3 
2026-02-07 00:00 UT   18 23 49.3   -22 09 50     4.677    4.004   42.3    9.5   269   34.3 
2026-02-08 00:00 UT   18 24 47.6   -22 08 53     4.666    4.003   43.1    9.7   269   34.3 
2026-02-09 00:00 UT   18 25 45.6   -22 07 54     4.654    4.002   43.9    9.8   269   34.3 
2026-02-10 00:00 UT   18 26 43.2   -22 06 54     4.642    4.002   44.7   10.0   269   34.3 
2026-02-11 00:00 UT   18 27 40.4   -22 05 53     4.630    4.001   45.5   10.1   268   34.3 
2026-02-12 00:00 UT   18 28 37.2   -22 04 50     4.618    4.000   46.3   10.3   268   34.3 
2026-02-13 00:00 UT   18 29 33.6   -22 03 46     4.606    3.999   47.1   10.4   268   34.3 
2026-02-14 00:00 UT   18 30 29.5   -22 02 41     4.593    3.998   47.9   10.6   268   34.3 
2026-02-15 00:00 UT   18 31 25.1   -22 01 34     4.580    3.998   48.7   10.7   268   34.3 
2026-02-16 00:00 UT   18 32 20.2   -22 00 27     4.568    3.997   49.5   10.8   268   34.3 
2026-02-17 00:00 UT   18 33 14.9   -21 59 18     4.555    3.996   50.3   11.0   268   34.3 
2026-02-18 00:00 UT   18 34 09.1   -21 58 08     4.541    3.995   51.1   11.1   268   34.3 
2026-02-19 00:00 UT   18 35 02.9   -21 56 57     4.528    3.994   51.9   11.2   267   34.3 
2026-02-20 00:00 UT   18 35 56.2   -21 55 45     4.515    3.993   52.7   11.4   267   34.3 
2026-02-21 00:00 UT   18 36 49.0   -21 54 32     4.501    3.992   53.5   11.5   267   34.3 
2026-02-22 00:00 UT   18 37 41.3   -21 53 18     4.487    3.991   54.3   11.6   267   34.3 

    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.