2021 TN9
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	21 Apr 2026	29.0	1.920 AU	0.954 AU	12h27m	-03°40'	157.1°	11.7°

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
2026-04-21 00:00 UT   12 27 04.3   -03 40 25     0.954    1.920  157.1   11.7   112   29.0 
2026-04-21 10:41 UT   12 26 28.6   -03 39 43     0.958    1.922  156.5   12.0   112   29.0 
2026-04-22 00:00 UT   12 25 44.9   -03 38 53     0.962    1.923  155.8   12.4   112   29.0 
2026-04-23 00:00 UT   12 24 28.2   -03 37 30     0.969    1.926  154.5   13.0   111   29.1 
2026-04-24 00:00 UT   12 23 14.2   -03 36 16     0.977    1.929  153.3   13.6   111   29.1 
2026-04-25 00:00 UT   12 22 02.8   -03 35 12     0.985    1.932  152.0   14.1   111   29.2 
2026-04-26 00:00 UT   12 20 54.2   -03 34 18     0.994    1.935  150.8   14.7   111   29.2 
2026-04-27 00:00 UT   12 19 48.3   -03 33 33     1.002    1.938  149.5   15.3   111   29.2 
2026-04-28 00:00 UT   12 18 45.1   -03 32 58     1.011    1.941  148.3   15.8   111   29.3 
2026-04-29 00:00 UT   12 17 44.7   -03 32 34     1.020    1.944  147.1   16.3   111   29.3 
2026-04-30 00:00 UT   12 16 47.1   -03 32 19     1.029    1.946  145.9   16.9   111   29.4 
2026-05-01 00:00 UT   12 15 52.2   -03 32 14     1.038    1.949  144.7   17.4   111   29.4 
2026-05-02 00:00 UT   12 15 00.0   -03 32 20     1.047    1.952  143.6   17.9   111   29.4 
2026-05-03 00:00 UT   12 14 10.6   -03 32 35     1.057    1.955  142.4   18.3   111   29.5 
2026-05-04 00:00 UT   12 13 24.0   -03 33 01     1.067    1.958  141.3   18.8   111   29.5 
2026-05-05 00:00 UT   12 12 40.0   -03 33 36     1.077    1.960  140.1   19.3   111   29.5 
2026-05-06 00:00 UT   12 11 58.8   -03 34 22     1.087    1.963  139.0   19.7   111   29.6 
2026-05-07 00:00 UT   12 11 20.2   -03 35 18     1.097    1.966  137.9   20.1   111   29.6 
2026-05-08 00:00 UT   12 10 44.3   -03 36 24     1.107    1.968  136.8   20.6   111   29.7 
2026-05-09 00:00 UT   12 10 11.0   -03 37 40     1.118    1.971  135.7   21.0   111   29.7 
2026-05-10 00:00 UT   12 09 40.4   -03 39 05     1.129    1.973  134.6   21.4   111   29.7 
2026-05-11 00:00 UT   12 09 12.3   -03 40 41     1.139    1.976  133.6   21.7   111   29.8 
2026-05-12 00:00 UT   12 08 46.8   -03 42 26     1.150    1.978  132.5   22.1   111   29.8 
2026-05-13 00:00 UT   12 08 23.8   -03 44 21     1.161    1.981  131.5   22.5   111   29.8 
2026-05-14 00:00 UT   12 08 03.3   -03 46 26     1.173    1.983  130.4   22.8   111   29.9 
2026-05-15 00:00 UT   12 07 45.2   -03 48 41     1.184    1.986  129.4   23.2   111   29.9 
2026-05-16 00:00 UT   12 07 29.7   -03 51 05     1.195    1.988  128.4   23.5   111   29.9 
2026-05-17 00:00 UT   12 07 16.5   -03 53 39     1.207    1.991  127.4   23.8   111   30.0 
2026-05-18 00:00 UT   12 07 05.7   -03 56 22     1.219    1.993  126.4   24.1   111   30.0 
2026-05-19 00:00 UT   12 06 57.2   -03 59 14     1.231    1.995  125.4   24.4   111   30.0 
2026-05-20 00:00 UT   12 06 51.0   -04 02 16     1.242    1.998  124.5   24.7   111   30.1 
2026-05-21 00:00 UT   12 06 47.1   -04 05 27     1.254    2.000  123.5   25.0   111   30.1 

    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.