2021 TN9
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	8 Jan 2026	29.8	1.486 AU	1.184 AU	13h31m	-00°51'	86.0°	41.3°

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 TN9 are:

            e (Eccentricity)                : 0.3670810
            a (Semimajor axis)              : 1.5405013
            i (Inclination)                 : 10.38239
            Ω (Longitude of ascending node) : 17.54289
            ω (Argument of perihelion)      : 35.46043
            M (Mean anomaly)                : 38.76843
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 52.55758
            B (Latitude of perihelion)      : 6.00130
            P (Orbital period in years)     : 1.91            
        

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
2026-01-08 00:00 UT   13 31 00.9   +00 51 31     1.184    1.486   86.0   41.3   292   29.8 
2026-01-08 16:33 UT   13 31 54.6   +00 58 17     1.181    1.489   86.5   41.2   292   29.8 
2026-01-09 00:00 UT   13 32 18.5   -01 01 18     1.179    1.491   86.7   41.2   292   29.8 
2026-01-10 00:00 UT   13 33 34.5   -01 10 55     1.175    1.496   87.3   41.0   292   29.8 
2026-01-11 00:00 UT   13 34 48.7   -01 20 22     1.170    1.501   88.0   40.9   292   29.8 
2026-01-12 00:00 UT   13 36 01.1   -01 29 39     1.165    1.507   88.6   40.7   292   29.8 
2026-01-13 00:00 UT   13 37 11.7   -01 38 47     1.160    1.512   89.3   40.6   292   29.8 
2026-01-14 00:00 UT   13 38 20.5   -01 47 44     1.155    1.517   90.0   40.4   291   29.8 
2026-01-15 00:00 UT   13 39 27.5   -01 56 31     1.149    1.522   90.7   40.3   291   29.8 
2026-01-16 00:00 UT   13 40 32.5   -02 05 09     1.144    1.527   91.4   40.1   291   29.7 
2026-01-17 00:00 UT   13 41 35.7   -02 13 36     1.139    1.532   92.1   39.9   291   29.7 
2026-01-18 00:00 UT   13 42 36.8   -02 21 53     1.133    1.538   92.9   39.7   291   29.7 
2026-01-19 00:00 UT   13 43 36.0   -02 29 59     1.128    1.543   93.6   39.5   291   29.7 
2026-01-20 00:00 UT   13 44 33.2   -02 37 56     1.123    1.548   94.3   39.3   291   29.7 
2026-01-21 00:00 UT   13 45 28.3   -02 45 42     1.117    1.553   95.1   39.1   290   29.7 
2026-01-22 00:00 UT   13 46 21.3   -02 53 18     1.112    1.558   95.8   38.9   290   29.7 
2026-01-23 00:00 UT   13 47 12.2   -03 00 44     1.106    1.563   96.6   38.7   290   29.7 
2026-01-24 00:00 UT   13 48 00.9   -03 07 60     1.100    1.568   97.4   38.5   290   29.7 
2026-01-25 00:00 UT   13 48 47.4   -03 15 05     1.095    1.573   98.2   38.3   290   29.7 
2026-01-26 00:00 UT   13 49 31.7   -03 21 60     1.089    1.578   99.0   38.1   290   29.7 
2026-01-27 00:00 UT   13 50 13.8   -03 28 44     1.083    1.583   99.8   37.8   290   29.6 
2026-01-28 00:00 UT   13 50 53.6   -03 35 19     1.078    1.588  100.6   37.6   289   29.6 
2026-01-29 00:00 UT   13 51 31.0   -03 41 43     1.072    1.593  101.4   37.3   289   29.6 
2026-01-30 00:00 UT   13 52 06.1   -03 47 56     1.066    1.597  102.2   37.1   289   29.6 
2026-01-31 00:00 UT   13 52 38.9   -03 53 59     1.060    1.602  103.1   36.8   289   29.6 
2026-02-01 00:00 UT   13 53 09.1   -03 59 52     1.054    1.607  103.9   36.5   289   29.6 
2026-02-02 00:00 UT   13 53 37.0   -04 05 34     1.048    1.612  104.8   36.2   289   29.6 
2026-02-03 00:00 UT   13 54 02.3   -04 11 06     1.043    1.617  105.7   35.9   289   29.6 
2026-02-04 00:00 UT   13 54 25.0   -04 16 27     1.037    1.622  106.6   35.6   289   29.5 
2026-02-05 00:00 UT   13 54 45.2   -04 21 37     1.031    1.626  107.5   35.3   288   29.5 
2026-02-06 00:00 UT   13 55 02.7   -04 26 37     1.025    1.631  108.4   35.0   288   29.5 
2026-02-07 00:00 UT   13 55 17.6   -04 31 26     1.019    1.636  109.3   34.7   288   29.5 

    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.