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Discovery
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|---|---|
| Discovered by | Michael E. Brown, Chadwick A. Trujillo[1] |
| Discovery date | December 18, 2001 |
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Designations
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| MPC designation | (126154) 2001 YH140 |
| Alternate name(s) | none |
| Minor planet category |
TNO (Resonant)[2] |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 48.39 AU |
| Perihelion | 36.368 AU |
| Semi-major axis | 42.204 AU) |
| Eccentricity | 0.138 |
| Orbital period | 100297.827 d (274.60 a) |
| Mean anomaly | 13.5° |
| Inclination | 11.1° |
| Longitude of ascending node | 108.9° |
| Argument of perihelion | 354.4° |
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Physical characteristics
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| Dimensions | 345 ± 45 km[4] |
| Mass | ~4.0×1019 kg |
| Mean density | 2.0 g/cm³ (assumed) |
| Equatorial surface gravity | ~0.09 m/s² |
| Escape velocity | ~0.18 km/s |
| Sidereal rotation period |
13.25 ± 0.2 h[5] |
| Albedo | 0.06–0.10[4] |
| Temperature | ~42 K |
| Absolute magnitude (H) | 5.8[4] |
(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.
(126154) 2001 YH140 is locked in the 5:3 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]
In 2010 thermal flux from 2001 YH140 in the far-infrared was measured by the Herschel Space Telescope. As a result its equivalent size was estimated to lie within a range from 300 to 390 km.[4]
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