(47171) 1999 TC36

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The correct title of this article is (47171) 1999 TC₃₆. It features superscript or subscript characters that are substituted or omitted because of technical limitations.

**(47171) 1999 TC₃₆**
Discovery ^A

Discoverer	E. P. Rubenstein, L.-G. Strolger
Discovery date	October 1, 1999
Alternate designations ^B	none
Category	Trans-Neptunian object
Orbital elements ^C
Epoch June 14, 2006 (JD 2453900.5)
Eccentricity (e)	0.222
Semi-major axis (a)	5872.651 G m (39.256 AU)
Perihelion (q)	4571.710 Gm (30.560 AU)
Aphelion (Q)	7173.592 Gm (47.952 AU)
Orbital period (P)	89838.309 d (245.96 a)
Mean orbital speed	4.69 km/s
Inclination (i)	8.416°
Longitude of the ascending node (Ω)	97.059°
Argument of perihelion (ω)	295.003°
Mean anomaly (M)	346.981°
Physical characteristics ^D
Dimensions	350-470 km (eff. diameter)
Mass	1.8–1.6×10¹⁹ kg
Density	0.8-0.3 g/cm³ (eff.)
Surface gravity	0.039–0.020 m/s²
Escape velocity	0.117–0.096 km/s
Rotation period	? d
Spectral class	?
Absolute magnitude	4.73
Albedo (geometric)	0.055-0.11 (eff.)
Mean surface temperature	~45–44 K
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(47171) 1999 TC₃₆ (also written: (47171) 1999 TC36) is a trans-Neptunian object. It was discovered in 1999 by Eric P. Rubenstein and Louis-Gregory Strolger. It is classified as a plutino. It was the first Trans-Neptunian object discovered to have a companion, S/2001 (47171) 1, and is also one of the brightest Trans-Neptunian objects.

[edit] S/2001 (47171) 1

The companion, discovered from 8 December 2001 observations by C. A. Trujillo and M. E. Brown using the Hubble Space Telescope and announced on 10 January 2002, has an estimated diameter of 142±23 km and a semi-major axis of 7640±460 km, orbiting its primary in 50.38±0.5 d.

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