Orbit of NEA 2012 TC4

Orbital elements listed here are taken from the JPL Horizons website, and represent the current best solution. The orbit will be perturbed significantly during the close approach to the Earth, so we provide both the Keplerian elements for both the pre- and post-Earth encounter.

Orbital Elements (Solution JPL#36)

Pre-Earth Encounter Post-Earth Encounter
Epoch 2458000.5 (2017-Sep-04.0) 2458040.5 (2017-Nov-23.0)
Perihelion Time T = 2017-Nov-16.03778655 UT T = 2017-Nov-03.95219062 UT
Perihelion Time (JD) T = 2458073.53778655 T = 2458061.45219062
Orbital Period P = 1.6666 yr P = 2.0825 yr
Semi-major Axis a = 1.405677 AU a = 1.630734 AU
Perihelion Distance q = 0.933637 AU q = 0.965214 AU
Eccentricity e = 0.335810 e = 0.408111
Inclination (J2000) i = 0.8565° i = 0.5383°
Ascending Node (J2000) Ω = 198.2492° Ω = 198.5459°
Argument of Perihelion (J2000) ω = 222.5627° ω = 263.8460°
Perigee Time t = Oct 12, 2017 05:40:55±20s UT
Perigee Distance Δ = 50,168 ±40 km AU
Min. Orbital Intersection Dist. MOID = 0.00012646 AU

Full Orbit From Above

View of 2012 TC4's pre-encounter orbit as seen from the North ecliptic pole with the asteroid and planets shown at the time of the asteroid's closest approach to Earth. From the JPL Small-Body Database Browser.
View of 2012 TC4's entire orbit.

Orbit in Oblique View

Oblique view of the portion of 2012 TC4's orbit around perigee, viewed from 30° above the ecliptic plane. The black dot denotes the asteroid's and Earth's positions at perigee (12 Oct 2017). The solid arrow shows the pre- and post-Earth encounter trajectories, while the dashed arrow shows the post-encounter keplerian trajectory that would have resulted if the Earth's gravity did not alter the asteroid's orbit. The asteroid's orbit lies within a degree of the ecliptic plane.
Oblique view of 2012 TC4's orbit.

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