(55636) 2002 TX300

(55636) 2002 TX₃₀₀
	Hubble Space Telescope image of 2002 TX300 taken in 2005
Discovery
Discovered by	NEAT (644)
Discovery site	Palomar Mountain
Discovery date	15 October 2002
Designations
MPC designation	(55636) 2002 TX300
Minor planet category	TNO; Cubewano; Extended (DES);
Orbital characteristics
	Epoch 13 January 2016 (JD 2457400.5)
	Uncertainty parameter 2
Observation arc	22380 days (61.27 yr)
Aphelion	48.365 AU (7.2353 Tm)
Perihelion	37.8672 AU (5.66485 Tm)
Semi-major axis	43.116 AU (6.4501 Tm)
Eccentricity	0.12174
Orbital period (sidereal)	283.12 yr (103408 d)
Mean anomaly	73.7618°
Mean motion	0° 0m 12.533s / day
Inclination	25.87838°
Longitude of ascending node	324.6984°
Argument of perihelion	338.958°
Physical characteristics
Mean radius	143±5 km (occultation); <320.6+125.2; −103.4 km (Spitzer two-band thermal model);
Mass	~1.2×1019 kg (assumed)
Synodic rotation period	8.12 h (0.338 d)
Sidereal rotation period	0.504 d (12.101 h)
Geometric albedo	0.88+0.15; −0.06; > 0.173+0.203; −0.083 (Spitzer);
Temperature	< 41 K
Spectral type	(Neutral); B–V = 0.66; V–R = 0.36; B0–V0 = 0.869;
Apparent magnitude	19.4
Absolute magnitude (H)	3.4

(55636) 2002 TX₃₀₀ is a bright Kuiper belt object in the outer Solar System estimated to be about 286 kilometres (178 mi) in diameter.^[4] It is a large member of the Haumea family that was discovered on 15 October 2002 by the Near-Earth Asteroid Tracking (NEAT) program.^[1]

2002 TX₃₀₀ is a classical Kuiper belt object with an absolute magnitude between that of 50000 Quaoar and 20000 Varuna. 2002 TX₃₀₀ has the most eccentric and inclined orbit of the three.

A variability of the visual brightness was also detected which could fit to 7.9 h or 15.8 h rotational period (the distinction between single or double-peaked curved could not be made with confidence). The changes in brightness are quite close to the error margin and could also be due to an irregular shape.^[10]

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Discovery^[1]
Hubble Space Telescope image of 2002 TX₃₀₀ taken in 2005
Discovered by	NEAT (644)
Discovery site	Palomar Mountain
Discovery date	15 October 2002
Designations
MPC designation	(55636) 2002 TX₃₀₀
Minor planet category	TNO Cubewano^[2] Extended (DES)^[3]
Orbital characteristics^[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 2
Observation arc	22380 days (61.27 yr)
Aphelion	48.365 AU (7.2353 Tm)
Perihelion	37.8672 AU (5.66485 Tm)
Semi-major axis	43.116 AU (6.4501 Tm)
Eccentricity	0.12174
Orbital period (sidereal)	283.12 yr (103408 d)
Mean anomaly	73.7618°
Mean motion	0° 0^m 12.533^s / day
Inclination	25.87838°
Longitude of ascending node	324.6984°
Argument of perihelion	338.958°
Physical characteristics
Mean radius	143±5 km (occultation)^[4] <320.6+125.2 −103.4 km (Spitzer two-band thermal model)^[5]
Mass	~1.2×10¹⁹ kg (assumed)^[6]
Synodic rotation period	8.12 h (0.338 d)
Sidereal rotation period	0.504 d (12.101 h)^[1]
Geometric albedo	0.88+0.15 −0.06^[4] > 0.173+0.203 −0.083 (Spitzer)^[5]
Temperature	< 41 K
Spectral type	(Neutral) B–V = 0.66 V–R = 0.36^[7] B₀–V₀ = 0.869^[8]
Apparent magnitude	19.4^[9]
Absolute magnitude (H)	3.4^[1]

(55636) 2002 TX300

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