2021 TN9
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	8 Apr 2026	28.3	1.879 AU	0.880 AU	12h47m	-04°11'	174.7°	2.8°

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
2026-04-08 00:00 UT   12 47 41.5   -04 11 55     0.880    1.879  174.7    2.8   122   28.3 
2026-04-08 08:29 UT   12 47 03.8   -04 10 51     0.881    1.880  174.2    3.1   121   28.4 
2026-04-09 00:00 UT   12 45 55.3   -04 08 55     0.884    1.882  173.3    3.5   119   28.4 
2026-04-10 00:00 UT   12 44 10.4   -04 05 59     0.888    1.886  172.0    4.3   117   28.5 
2026-04-11 00:00 UT   12 42 27.2   -04 03 08     0.893    1.889  170.6    5.0   116   28.5 
2026-04-12 00:00 UT   12 40 45.6   -04 00 21     0.898    1.892  169.2    5.7   115   28.6 
2026-04-13 00:00 UT   12 39 05.8   -03 57 41     0.903    1.895  167.8    6.4   114   28.6 
2026-04-14 00:00 UT   12 37 27.9   -03 55 06     0.909    1.899  166.4    7.1   114   28.7 
2026-04-15 00:00 UT   12 35 52.0   -03 52 37     0.915    1.902  165.1    7.8   113   28.7 
2026-04-16 00:00 UT   12 34 18.2   -03 50 16     0.921    1.905  163.7    8.5   113   28.8 
2026-04-17 00:00 UT   12 32 46.7   -03 48 02     0.927    1.908  162.4    9.2   112   28.8 
2026-04-18 00:00 UT   12 31 17.4   -03 45 55     0.933    1.911  161.1    9.8   112   28.8 
2026-04-19 00:00 UT   12 29 50.6   -03 43 57     0.940    1.914  159.7   10.5   112   28.9 
2026-04-20 00:00 UT   12 28 26.2   -03 42 07     0.947    1.917  158.4   11.1   112   28.9 
2026-04-21 00:00 UT   12 27 04.3   -03 40 25     0.954    1.920  157.1   11.7   112   29.0 
2026-04-22 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 

    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.