(225088) Gonggong
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	21 Dec 2025	21.5	89.698 AU	90.096 AU	22h28m	-10°31'	65.8°	0.6°
Opposition	28 Aug 2026	21.4	89.843 AU	88.833 AU	22h30m	-10°08'	178.9°	0.0°

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 Gonggong are:

            e (Eccentricity)                : 0.5031767
            a (Semimajor axis)              : 66.8950294
            i (Inclination)                 : 30.86640
            Ω (Longitude of ascending node) : 336.84008
            ω (Argument of perihelion)      : 206.64413
            M (Mean anomaly)                : 111.38406
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 0.13993
            B (Latitude of perihelion)      : -13.30123
            P (Orbital period in years)     : 547.13            
        

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
2025-12-21 00:00 UT   22 28 01.4   -10 31 15    90.096   89.698   65.8    0.6    69   21.5 
2025-12-21 09:42 UT   22 28 01.9   -10 31 11    90.102   89.698   65.4    0.6    69   21.5 
2025-12-22 00:00 UT   22 28 02.6   -10 31 06    90.112   89.699   64.8    0.6    69   21.5 
2025-12-23 00:00 UT   22 28 03.8   -10 30 56    90.129   89.699   63.8    0.6    69   21.5 
2025-12-24 00:00 UT   22 28 05.1   -10 30 47    90.145   89.700   62.8    0.6    69   21.5 
2025-12-25 00:00 UT   22 28 06.4   -10 30 37    90.161   89.700   61.8    0.6    69   21.5 
2025-12-26 00:00 UT   22 28 07.7   -10 30 27    90.177   89.701   60.8    0.5    69   21.5 
2025-12-27 00:00 UT   22 28 09.1   -10 30 17    90.192   89.701   59.8    0.5    69   21.5 
2025-12-28 00:00 UT   22 28 10.5   -10 30 06    90.208   89.702   58.8    0.5    69   21.5 
2025-12-29 00:00 UT   22 28 11.9   -10 29 56    90.223   89.703   57.7    0.5    69   21.5 
2025-12-30 00:00 UT   22 28 13.4   -10 29 45    90.239   89.703   56.7    0.5    69   21.5 
2025-12-31 00:00 UT   22 28 14.9   -10 29 34    90.254   89.704   55.7    0.5    69   21.5 
2026-01-01 00:00 UT   22 28 16.5   -10 29 22    90.269   89.704   54.7    0.5    69   21.5 
2026-01-02 00:00 UT   22 28 18.1   -10 29 11    90.283   89.705   53.7    0.5    69   21.5 
2026-01-03 00:00 UT   22 28 19.7   -10 28 59    90.298   89.706   52.7    0.5    69   21.5 
2026-01-04 00:00 UT   22 28 21.4   -10 28 47    90.312   89.706   51.7    0.5    69   21.5 
2026-01-05 00:00 UT   22 28 23.1   -10 28 35    90.326   89.707   50.7    0.5    69   21.5 
2026-01-06 00:00 UT   22 28 24.8   -10 28 23    90.340   89.707   49.7    0.5    69   21.5 
2026-01-07 00:00 UT   22 28 26.6   -10 28 11    90.354   89.708   48.6    0.5    69   21.5 
2026-01-08 00:00 UT   22 28 28.4   -10 27 58    90.368   89.708   47.6    0.5    69   21.5 
2026-01-09 00:00 UT   22 28 30.2   -10 27 45    90.381   89.709   46.6    0.5    69   21.5 
2026-01-10 00:00 UT   22 28 32.1   -10 27 32    90.394   89.710   45.6    0.4    69   21.5 
2026-01-11 00:00 UT   22 28 34.0   -10 27 19    90.407   89.710   44.6    0.4    69   21.5 
2026-01-12 00:00 UT   22 28 35.9   -10 27 06    90.420   89.711   43.6    0.4    69   21.5 
2026-01-13 00:00 UT   22 28 37.8   -10 26 52    90.433   89.711   42.6    0.4    69   21.5 
2026-01-14 00:00 UT   22 28 39.8   -10 26 39    90.445   89.712   41.6    0.4    69   21.5 
2026-01-15 00:00 UT   22 28 41.8   -10 26 25    90.457   89.713   40.6    0.4    69   21.5 
2026-01-16 00:00 UT   22 28 43.9   -10 26 11    90.469   89.713   39.6    0.4    70   21.5 
2026-01-17 00:00 UT   22 28 45.9   -10 25 57    90.481   89.714   38.5    0.4    70   21.5 
2026-01-18 00:00 UT   22 28 48.0   -10 25 43    90.492   89.714   37.5    0.4    70   21.5 
2026-01-19 00:00 UT   22 28 50.1   -10 25 28    90.503   89.715   36.5    0.4    70   21.5 
2026-01-20 00:00 UT   22 28 52.3   -10 25 14    90.514   89.715   35.5    0.4    70   21.5 

    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.