2005 TN53

2005 TN₅₃
Discovery
Discovered by	C. Trujillo; S. S. Sheppard;
Discovery site	Las Campanas Obs.
Discovery date	7 October 2005; (discovery: first observation only)
Designations
MPC designation	2005 TN53
Minor planet category	Neptune trojan; L4; centaur; distant;
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 4
Observation arc	8.00 yr (2,921 days)
Aphelion	31.940 AU
Perihelion	28.088 AU
Semi-major axis	30.014 AU
Eccentricity	0.0642
Orbital period (sidereal)	164.43 yr (60,059 days)
Mean anomaly	301.81°
Mean motion	0° 0m 21.6s / day
Inclination	25.044°
Longitude of ascending node	9.3277°
Argument of perihelion	90.167°
Physical characteristics
Dimensions	68 km (est. at 0.10); 80 km;
Apparent magnitude	23.7
Absolute magnitude (H)	9.0

2005 TN₅₃ is an inclined Neptune trojan leading Neptune's orbit in the outer Solar System, approximately 80 kilometers in diameter. It was first observed on 7 October 2005, by American astronomers Scott Sheppard and Chad Trujillo at Las Campanas Observatory in the Atacama desert of Chile.^[2]^[3] It was the third such body to be discovered, and the first with a significant orbital inclination, which showed that the population as a whole is very dynamically excited.

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Discovery^[1]^[2]^[3]
Discovered by	C. Trujillo S. S. Sheppard
Discovery site	Las Campanas Obs.
Discovery date	7 October 2005 (discovery: first observation only)
Designations
MPC designation	2005 TN₅₃
Minor planet category	Neptune trojan L₄^[4] centaur^[1] distant^[2]
Orbital characteristics^[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 4
Observation arc	8.00 yr (2,921 days)
Aphelion	31.940 AU
Perihelion	28.088 AU
Semi-major axis	30.014 AU
Eccentricity	0.0642
Orbital period (sidereal)	164.43 yr (60,059 days)
Mean anomaly	301.81°
Mean motion	0° 0^m 21.6^s / day
Inclination	25.044°
Longitude of ascending node	9.3277°
Argument of perihelion	90.167°
Physical characteristics
Dimensions	68 km (est. at 0.10)^[5] 80 km^[6]
Apparent magnitude	23.7^[6]
Absolute magnitude (H)	9.0^[1]