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(126154) 2001 Yh140

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Subject: List of possible dwarf planets, Michael E. Brown, Sednoid
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(126154) 2001 Yh140

(126154) 2001 YH140
Discovered by Michael E. Brown,
Chadwick A. Trujillo[1]
Discovery date December 18, 2001
MPC designation (126154) 2001 YH140
Minor planet category TNO (3:5 resonance)[2]
Orbital characteristics[1][3]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 48.39 AU
Perihelion 36.368 AU
42.204 AU
Eccentricity 0.138
274.60 a (100,297.827 d)
Inclination 11.1°
Physical characteristics
Dimensions 345 ± 45 km[4]
Mass ~4.0×1019 kg
Sidereal rotation period
13.25 ± 0.2 h[5]
Albedo 0.06–0.10[4]
Temperature ~42 K

(126154) 2001 YH140, also written as (126154) 2001 YH140, is a resonant trans-Neptunian object discovered on December 18, 2001 by C. A. Trujillo, M. E. Brown.

Orbit and rotation

(126154) 2001 YH140 is locked in 3:5 mean motion resonance with Neptune.[4] When it makes three revolutions around the Sun, Neptune makes exactly five. The rotation period of 2001 YH140 is estimated to be 13.25 ± 0.2 hours.[5]

Physical characteristics

In 2010 thermal flux from 2001 YH140 in the far-infrared was measured by the Herschel Space Telescope. As a result its size has been estimated to be 300–390 km (190–240 mi).[4]


  1. ^ a b "List Of Transneptunian Objects". IAU Minor Planet Center. Retrieved 2011-01-08. 
  2. ^ "MPEC 2009-R09 :Distant Minor Planets (16 September 2009.0 TT)". IAU Minor Planet Center. 2009-09-04. Retrieved 2009-10-04. 
  3. ^ "JPL Small-Body Database Browser: (126154) 2001 YH140" (last obs). 2009-02-02. Retrieved 2010-08-03. 
  4. ^ a b c d e Müller, T. G.; Lellouch, E.; Stansberry, J.; Kiss, C.; Santos-Sanz, P.; Vilenius, E.; Protopapa, S.; Moreno, R.; Mueller, M.; Delsanti, A.; Duffard, R.; Fornasier, S.; Groussin, O.; Harris, A. W.; Henry, F.; Horner, J.; Lacerda, P.; Lim, T.; Mommert, M.; Ortiz, J. L.; Rengel, M.; Thirouin, A.; Trilling, D.; Barucci, A.; Crovisier, J.; Doressoundiram, A.; Dotto, E.; Gutiérrez, P. J.; Hainaut, O. R.; Hartogh, P. (July–August 2010). ""TNOs are Cool": A survey of the trans-Neptunian region".  
  5. ^ a b Sheppard, Scott S. (August 2007). "Light Curves of Dwarf Plutonian Planets and other Large Kuiper Belt Objects: Their Rotations, Phase Functions, and Absolute Magnitudes".  

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