2021 UJ3
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	24 Dec 2025	32.7	3.231 AU	2.817 AU	10h57m	-00°49'	106.1°	17.0°

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 2021 UJ3 are:

            e (Eccentricity)                : 0.5779991
            a (Semimajor axis)              : 2.0829322
            i (Inclination)                 : 6.67446
            Ω (Longitude of ascending node) : 213.60260
            ω (Argument of perihelion)      : 124.13298
            M (Mean anomaly)                : 141.64056
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 157.91678
            B (Latitude of perihelion)      : 5.52075
            P (Orbital period in years)     : 3.01            
        

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   10 57 10.6   +00 49 11     2.817    3.231  106.1   17.0   295   32.7 
2025-12-24 14:49 UT   10 57 10.4   +00 50 22     2.809    3.232  106.7   16.9   295   32.7 
2025-12-25 00:00 UT   10 57 10.1   +00 51 05     2.803    3.232  107.1   16.9   295   32.7 
2025-12-26 00:00 UT   10 57 08.3   +00 52 52     2.790    3.233  108.1   16.8   295   32.7 
2025-12-27 00:00 UT   10 57 05.2   +00 54 31     2.777    3.235  109.1   16.7   295   32.7 
2025-12-28 00:00 UT   10 57 00.8   +00 56 02     2.763    3.236  110.1   16.6   295   32.6 
2025-12-29 00:00 UT   10 56 55.2   +00 57 25     2.750    3.237  111.1   16.5   295   32.6 
2025-12-30 00:00 UT   10 56 48.2   +00 58 39     2.737    3.239  112.2   16.3   296   32.6 
2025-12-31 00:00 UT   10 56 39.9   +00 59 46     2.724    3.240  113.2   16.2   296   32.6 
2026-01-01 00:00 UT   10 56 30.3   -01 00 44     2.711    3.241  114.2   16.1   296   32.6 
2026-01-02 00:00 UT   10 56 19.3   -01 01 34     2.698    3.242  115.3   15.9   296   32.6 
2026-01-03 00:00 UT   10 56 07.1   -01 02 15     2.685    3.243  116.3   15.8   296   32.6 
2026-01-04 00:00 UT   10 55 53.4   -01 02 47     2.673    3.245  117.4   15.6   296   32.5 
2026-01-05 00:00 UT   10 55 38.5   -01 03 11     2.660    3.246  118.4   15.4   297   32.5 
2026-01-06 00:00 UT   10 55 22.2   -01 03 25     2.648    3.247  119.5   15.3   297   32.5 
2026-01-07 00:00 UT   10 55 04.5   -01 03 31     2.635    3.248  120.6   15.1   297   32.5 
2026-01-08 00:00 UT   10 54 45.5   -01 03 28     2.623    3.249  121.7   14.9   297   32.5 
2026-01-09 00:00 UT   10 54 25.1   -01 03 16     2.611    3.250  122.7   14.7   297   32.5 
2026-01-10 00:00 UT   10 54 03.3   -01 02 54     2.599    3.251  123.8   14.6   298   32.5 
2026-01-11 00:00 UT   10 53 40.2   -01 02 23     2.588    3.252  124.9   14.4   298   32.4 
2026-01-12 00:00 UT   10 53 15.7   -01 01 42     2.576    3.253  126.0   14.2   298   32.4 
2026-01-13 00:00 UT   10 52 49.9   -01 00 52     2.565    3.254  127.1   13.9   298   32.4 
2026-01-14 00:00 UT   10 52 22.7   +00 59 53     2.553    3.255  128.3   13.7   299   32.4 
2026-01-15 00:00 UT   10 51 54.1   +00 58 43     2.542    3.256  129.4   13.5   299   32.4 
2026-01-16 00:00 UT   10 51 24.2   +00 57 24     2.531    3.257  130.5   13.3   299   32.4 
2026-01-17 00:00 UT   10 50 53.0   +00 55 56     2.521    3.258  131.6   13.0   299   32.3 
2026-01-18 00:00 UT   10 50 20.4   +00 54 17     2.510    3.259  132.8   12.8   300   32.3 
2026-01-19 00:00 UT   10 49 46.5   +00 52 29     2.500    3.260  133.9   12.6   300   32.3 
2026-01-20 00:00 UT   10 49 11.3   +00 50 31     2.490    3.261  135.0   12.3   300   32.3 
2026-01-21 00:00 UT   10 48 34.8   +00 48 23     2.480    3.262  136.2   12.1   301   32.3 
2026-01-22 00:00 UT   10 47 57.0   +00 46 05     2.470    3.263  137.3   11.8   301   32.2 
2026-01-23 00:00 UT   10 47 18.0   +00 43 37     2.461    3.264  138.5   11.5   301   32.2 

    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.