2019 WH4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	24 Dec 2025	34.0	4.027 AU	5.000 AU	17h35m	-22°23'	7.7°	1.9°

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
2025-12-24 00:00 UT   17 35 39.5   -22 23 18     5.000    4.027    7.7    1.9   279   34.0 
2025-12-24 09:59 UT   17 36 07.6   -22 23 28     4.999    4.027    8.1    2.0   279   34.1 
2025-12-25 00:00 UT   17 36 47.0   -22 23 42     4.997    4.027    8.5    2.1   279   34.1 
2025-12-26 00:00 UT   17 37 54.5   -22 24 04     4.994    4.027    9.2    2.2   278   34.1 
2025-12-27 00:00 UT   17 39 01.9   -22 24 24     4.991    4.026   10.0    2.4   277   34.1 
2025-12-28 00:00 UT   17 40 09.2   -22 24 42     4.988    4.026   10.8    2.6   277   34.1 
2025-12-29 00:00 UT   17 41 16.4   -22 24 58     4.985    4.026   11.5    2.8   277   34.1 
2025-12-30 00:00 UT   17 42 23.6   -22 25 12     4.981    4.025   12.3    3.0   276   34.1 
2025-12-31 00:00 UT   17 43 30.7   -22 25 24     4.977    4.025   13.0    3.2   276   34.1 
2026-01-01 00:00 UT   17 44 37.7   -22 25 34     4.973    4.025   13.8    3.3   275   34.1 
2026-01-02 00:00 UT   17 45 44.6   -22 25 43     4.969    4.024   14.6    3.5   275   34.1 
2026-01-03 00:00 UT   17 46 51.4   -22 25 49     4.964    4.024   15.3    3.7   275   34.2 
2026-01-04 00:00 UT   17 47 58.0   -22 25 53     4.959    4.024   16.1    3.9   275   34.2 
2026-01-05 00:00 UT   17 49 04.6   -22 25 55     4.954    4.023   16.8    4.1   274   34.2 
2026-01-06 00:00 UT   17 50 11.0   -22 25 55     4.949    4.023   17.6    4.2   274   34.2 
2026-01-07 00:00 UT   17 51 17.3   -22 25 54     4.944    4.022   18.4    4.4   274   34.2 
2026-01-08 00:00 UT   17 52 23.5   -22 25 50     4.938    4.022   19.1    4.6   274   34.2 
2026-01-09 00:00 UT   17 53 29.5   -22 25 45     4.932    4.022   19.9    4.8   273   34.2 
2026-01-10 00:00 UT   17 54 35.4   -22 25 37     4.926    4.021   20.7    4.9   273   34.2 
2026-01-11 00:00 UT   17 55 41.1   -22 25 27     4.920    4.021   21.4    5.1   273   34.2 
2026-01-12 00:00 UT   17 56 46.7   -22 25 16     4.914    4.020   22.2    5.3   273   34.2 
2026-01-13 00:00 UT   17 57 52.1   -22 25 03     4.907    4.020   22.9    5.5   273   34.2 
2026-01-14 00:00 UT   17 58 57.3   -22 24 47     4.900    4.019   23.7    5.6   272   34.2 
2026-01-15 00:00 UT   18 00 02.4   -22 24 30     4.893    4.019   24.5    5.8   272   34.2 
2026-01-16 00:00 UT   18 01 07.2   -22 24 11     4.886    4.018   25.3    6.0   272   34.2 
2026-01-17 00:00 UT   18 02 11.8   -22 23 50     4.878    4.018   26.0    6.2   272   34.2 
2026-01-18 00:00 UT   18 03 16.3   -22 23 27     4.871    4.017   26.8    6.3   272   34.2 
2026-01-19 00:00 UT   18 04 20.5   -22 23 03     4.863    4.017   27.6    6.5   272   34.2 
2026-01-20 00:00 UT   18 05 24.5   -22 22 36     4.855    4.016   28.3    6.7   271   34.3 
2026-01-21 00:00 UT   18 06 28.2   -22 22 08     4.847    4.015   29.1    6.8   271   34.3 
2026-01-22 00:00 UT   18 07 31.7   -22 21 38     4.838    4.015   29.9    7.0   271   34.3 
2026-01-23 00:00 UT   18 08 35.0   -22 21 06     4.830    4.014   30.7    7.2   271   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.