2021 UJ3
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	23 Jan 2026	32.2	3.264 AU	2.461 AU	10h47m	-00°43'	138.5°	11.5°

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
2026-01-23 00:00 UT   10 47 18.0   +00 43 37     2.461    3.264  138.5   11.5   301   32.2 
2026-01-23 15:41 UT   10 46 51.8   +00 41 56     2.455    3.264  139.3   11.4   302   32.2 
2026-01-24 00:00 UT   10 46 37.7   +00 40 60     2.452    3.265  139.7   11.3   302   32.2 
2026-01-25 00:00 UT   10 45 56.2   +00 38 13     2.443    3.265  140.8   11.0   302   32.2 
2026-01-26 00:00 UT   10 45 13.5   +00 35 16     2.434    3.266  142.0   10.7   303   32.2 
2026-01-27 00:00 UT   10 44 29.7   +00 32 10     2.425    3.267  143.2   10.4   303   32.2 
2026-01-28 00:00 UT   10 43 44.7   +00 28 54     2.417    3.268  144.3   10.1   303   32.1 
2026-01-29 00:00 UT   10 42 58.5   +00 25 28     2.409    3.269  145.5    9.8   304   32.1 
2026-01-30 00:00 UT   10 42 11.3   +00 21 54     2.401    3.269  146.7    9.5   305   32.1 
2026-01-31 00:00 UT   10 41 23.0   +00 18 10     2.394    3.270  147.9    9.2   305   32.1 
2026-02-01 00:00 UT   10 40 33.7   +00 14 17     2.386    3.271  149.1    8.9   306   32.1 
2026-02-02 00:00 UT   10 39 43.4   +00 10 14     2.379    3.272  150.2    8.6   306   32.0 
2026-02-03 00:00 UT   10 38 52.1   +00 06 03     2.373    3.272  151.4    8.3   307   32.0 
2026-02-04 00:00 UT   10 37 59.9   +00 01 43     2.366    3.273  152.6    8.0   308   32.0 
2026-02-05 00:00 UT   10 37 06.7   +00 02 46     2.360    3.274  153.8    7.6   309   32.0 
2026-02-06 00:00 UT   10 36 12.7   +00 07 23     2.354    3.274  155.0    7.3   310   32.0 
2026-02-07 00:00 UT   10 35 17.9   +00 12 08     2.348    3.275  156.2    7.0   311   31.9 
2026-02-08 00:00 UT   10 34 22.2   +00 17 02     2.343    3.275  157.3    6.7   312   31.9 
2026-02-09 00:00 UT   10 33 25.9   +00 22 04     2.338    3.276  158.5    6.3   313   31.9 
2026-02-10 00:00 UT   10 32 28.8   +00 27 14     2.333    3.277  159.7    6.0   314   31.9 
2026-02-11 00:00 UT   10 31 31.0   +00 32 31     2.329    3.277  160.8    5.7   316   31.9 
2026-02-12 00:00 UT   10 30 32.6   +00 37 56     2.325    3.278  162.0    5.4   318   31.8 
2026-02-13 00:00 UT   10 29 33.7   +00 43 28     2.321    3.278  163.1    5.0   320   31.8 
2026-02-14 00:00 UT   10 28 34.2   +00 49 06     2.318    3.279  164.2    4.7   322   31.8 
2026-02-15 00:00 UT   10 27 34.2   +00 54 52     2.314    3.279  165.3    4.4   325   31.8 
2026-02-16 00:00 UT   10 26 33.8   +01 00 44     2.312    3.280  166.3    4.1   328   31.8 
2026-02-17 00:00 UT   10 25 33.1   +01 06 41     2.309    3.280  167.3    3.8   331   31.8 
2026-02-18 00:00 UT   10 24 32.0   +01 12 45     2.307    3.281  168.3    3.5   335   31.7 
2026-02-19 00:00 UT   10 23 30.7   +01 18 54     2.305    3.281  169.2    3.2   340   31.7 
2026-02-20 00:00 UT   10 22 29.1   +01 25 08     2.303    3.282  170.0    3.0   345   31.7 
2026-02-21 00:00 UT   10 21 27.4   +01 31 27     2.302    3.282  170.7    2.8   352   31.7 
2026-02-22 00:00 UT   10 20 25.6   +01 37 50     2.301    3.282  171.2    2.6   359   31.7 

    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.