2021 TN9
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	21 May 2026	30.1	2.000 AU	1.254 AU	12h06m	-04°05'	123.5°	25.0°

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 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
2026-05-21 00:00 UT   12 06 47.1   -04 05 27     1.254    2.000  123.5   25.0   111   30.1 
2026-05-21 17:53 UT   12 06 45.6   -04 07 55     1.263    2.002  122.8   25.1   111   30.1 
2026-05-22 00:00 UT   12 06 45.4   -04 08 46     1.266    2.002  122.6   25.2   111   30.1 
2026-05-23 00:00 UT   12 06 45.8   -04 12 15     1.279    2.004  121.6   25.5   111   30.2 
2026-05-24 00:00 UT   12 06 48.4   -04 15 52     1.291    2.007  120.7   25.7   112   30.2 
2026-05-25 00:00 UT   12 06 53.1   -04 19 38     1.303    2.009  119.8   25.9   112   30.2 
2026-05-26 00:00 UT   12 06 59.8   -04 23 32     1.316    2.011  118.9   26.2   112   30.3 
2026-05-27 00:00 UT   12 07 08.6   -04 27 35     1.328    2.013  118.0   26.4   112   30.3 
2026-05-28 00:00 UT   12 07 19.2   -04 31 45     1.341    2.015  117.1   26.6   112   30.3 
2026-05-29 00:00 UT   12 07 31.8   -04 36 03     1.353    2.017  116.2   26.8   112   30.3 
2026-05-30 00:00 UT   12 07 46.3   -04 40 29     1.366    2.019  115.3   27.0   112   30.4 
2026-05-31 00:00 UT   12 08 02.6   -04 45 03     1.379    2.022  114.5   27.2   112   30.4 
2026-06-01 00:00 UT   12 08 20.8   -04 49 44     1.392    2.024  113.6   27.3   112   30.4 
2026-06-02 00:00 UT   12 08 40.6   -04 54 33     1.404    2.026  112.8   27.5   112   30.4 
2026-06-03 00:00 UT   12 09 02.3   -04 59 29     1.417    2.028  111.9   27.6   112   30.5 
2026-06-04 00:00 UT   12 09 25.6   -05 04 32     1.430    2.029  111.1   27.8   112   30.5 
2026-06-05 00:00 UT   12 09 50.5   -05 09 42     1.443    2.031  110.3   27.9   112   30.5 
2026-06-06 00:00 UT   12 10 17.1   -05 14 58     1.456    2.033  109.4   28.1   112   30.6 
2026-06-07 00:00 UT   12 10 45.3   -05 20 22     1.470    2.035  108.6   28.2   112   30.6 
2026-06-08 00:00 UT   12 11 15.0   -05 25 52     1.483    2.037  107.8   28.3   112   30.6 
2026-06-09 00:00 UT   12 11 46.3   -05 31 29     1.496    2.039  107.0   28.4   112   30.6 
2026-06-10 00:00 UT   12 12 19.0   -05 37 12     1.509    2.041  106.2   28.5   112   30.7 
2026-06-11 00:00 UT   12 12 53.3   -05 43 01     1.522    2.042  105.4   28.6   112   30.7 
2026-06-12 00:00 UT   12 13 28.9   -05 48 57     1.536    2.044  104.7   28.7   112   30.7 
2026-06-13 00:00 UT   12 14 06.0   -05 54 59     1.549    2.046  103.9   28.8   112   30.7 
2026-06-14 00:00 UT   12 14 44.5   -06 01 07     1.562    2.048  103.1   28.9   112   30.7 
2026-06-15 00:00 UT   12 15 24.4   -06 07 21     1.576    2.049  102.4   29.0   113   30.8 
2026-06-16 00:00 UT   12 16 05.6   -06 13 41     1.589    2.051  101.6   29.0   113   30.8 
2026-06-17 00:00 UT   12 16 48.1   -06 20 07     1.602    2.053  100.9   29.1   113   30.8 
2026-06-18 00:00 UT   12 17 31.9   -06 26 38     1.616    2.054  100.1   29.1   113   30.8 
2026-06-19 00:00 UT   12 18 16.9   -06 33 15     1.629    2.056   99.4   29.2   113   30.9 
2026-06-20 00:00 UT   12 19 03.2   -06 39 57     1.643    2.057   98.6   29.2   113   30.9 

    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.