2021 TN9
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	28 Feb 2026	29.1	1.730 AU	0.907 AU	13h49m	-05°29'	131.5°	25.4°

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
2026-02-28 00:00 UT   13 49 05.8   -05 29 11     0.907    1.730  131.5   25.4   286   29.1 
2026-02-28 20:36 UT   13 48 21.2   -05 29 47     0.903    1.734  132.6   24.9   286   29.1 
2026-03-01 00:00 UT   13 48 13.6   -05 29 52     0.902    1.735  132.7   24.8   286   29.1 
2026-03-02 00:00 UT   13 47 18.3   -05 30 21     0.898    1.739  133.9   24.2   286   29.0 
2026-03-03 00:00 UT   13 46 19.9   -05 30 40     0.894    1.743  135.2   23.6   286   29.0 
2026-03-04 00:00 UT   13 45 18.4   -05 30 47     0.890    1.747  136.4   23.0   286   29.0 
2026-03-05 00:00 UT   13 44 13.8   -05 30 43     0.886    1.751  137.7   22.4   286   29.0 
2026-03-06 00:00 UT   13 43 06.1   -05 30 29     0.882    1.756  138.9   21.8   286   29.0 
2026-03-07 00:00 UT   13 41 55.5   -05 30 04     0.879    1.760  140.2   21.2   285   28.9 
2026-03-08 00:00 UT   13 40 41.8   -05 29 28     0.875    1.764  141.5   20.5   285   28.9 
2026-03-09 00:00 UT   13 39 25.3   -05 28 41     0.872    1.768  142.8   19.9   285   28.9 
2026-03-10 00:00 UT   13 38 05.9   -05 27 44     0.869    1.772  144.1   19.2   285   28.9 
2026-03-11 00:00 UT   13 36 43.8   -05 26 37     0.866    1.776  145.4   18.5   285   28.8 
2026-03-12 00:00 UT   13 35 18.9   -05 25 20     0.864    1.780  146.8   17.8   285   28.8 
2026-03-13 00:00 UT   13 33 51.4   -05 23 53     0.861    1.784  148.1   17.1   285   28.8 
2026-03-14 00:00 UT   13 32 21.4   -05 22 16     0.859    1.788  149.5   16.4   285   28.8 
2026-03-15 00:00 UT   13 30 48.9   -05 20 30     0.857    1.792  150.8   15.7   285   28.7 
2026-03-16 00:00 UT   13 29 14.1   -05 18 36     0.855    1.796  152.2   15.0   284   28.7 
2026-03-17 00:00 UT   13 27 37.1   -05 16 32     0.853    1.800  153.6   14.2   284   28.7 
2026-03-18 00:00 UT   13 25 58.0   -05 14 21     0.852    1.803  155.0   13.5   284   28.7 
2026-03-19 00:00 UT   13 24 16.9   -05 12 02     0.851    1.807  156.4   12.8   284   28.6 
2026-03-20 00:00 UT   13 22 34.0   -05 09 36     0.850    1.811  157.8   12.0   284   28.6 
2026-03-21 00:00 UT   13 20 49.5   -05 07 03     0.849    1.815  159.2   11.2   284   28.6 
2026-03-22 00:00 UT   13 19 03.4   -05 04 23     0.848    1.819  160.6   10.5   283   28.6 
2026-03-23 00:00 UT   13 17 15.9   -05 01 38     0.848    1.822  162.0    9.7   283   28.5 
2026-03-24 00:00 UT   13 15 27.2   -04 58 48     0.848    1.826  163.5    8.9   283   28.5 

    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.