38628 Huya
| Discovery | |
|---|---|
| Discovered by | I. R. Ferrin |
| Discovery date | 10 March 2000 |
| Designations | |
| MPC designation | (38628) Huya |
| Pronunciation | /huːˈjɑː/ hoo-YAH |
|
Named after
|
Huya |
| 2000 EB173 | |
|
TNO Plutino Kozai |
|
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 7010 days (19.19 yr) |
| Aphelion | 50.723 AU (7.5881 Tm) |
| Perihelion | 28.533 AU (4.2685 Tm) |
| 39.628 AU (5.9283 Tm) | |
| Eccentricity | 0.27997 |
| 249.47 yr (91117.9 d) | |
|
Average orbital speed
|
4.63 km/s |
| 1.5319° | |
| 0° 0m 14.223s / day | |
| Inclination | 15.463° |
| 169.23° | |
| 67.576° | |
| Known satellites | 1 |
| Earth MOID | 27.5533 AU (4.12192 Tm) |
| Jupiter MOID | 23.3093 AU (3.48702 Tm) |
| Jupiter Tisserand parameter | 5.238 |
| Physical characteristics | |
| Dimensions | 406±16 km |
| 5.28 h (0.220 d) | |
|
Sidereal rotation period
|
13.5 hr(?) |
| 0.083 ± 0.004 | |
| Temperature | ≈44 K |
| B−V=0.95 ± 0.05 V−R=0.57 ± 0.09 |
|
| 19.3 (opposition) | |
| 5.04 ± 0.03 5.37 ± 0.04 4.9 |
|
| 0.020″ (max) | |
38628 Huya is a trans-Neptunian object (TNO). It is a plutino, being in a 2:3 mean-motion resonance with Neptune. It has a diameter of 458.0±9.2 km, and it is possibly a dwarf planet (icy trans-Neptunian objects with a diameter above around 400 kilometres (250 mi) are expected to be spherical), although the IAU has never classified it as such. Light-curve-amplitude analysis shows only small deviations, suggesting that Huya is likely a spheroid with small albedo spots. As of 2010, astronomer Gonzalo Tancredi thought that Huya was very probably a dwarf planet.
Huya was discovered in March 2000 by Ignacio Ferrin and announced on 24 October 2000. At the time of its discovery, Huya was the brightest (and hence estimated to be the biggest) trans-Neptunian object found since Pluto. It was found using data collected at the CIDA Observatory in Venezuela.
It was named Huya, after Juyá the Wayuu rain god, in August 2003 by the International Astronomical Union (IAU).
The Spitzer Space Telescope has estimated Huya to be about 530 kilometres (330 mi) in diameter with a low albedo of around 0.05. The later termination, based on a combination of Spitzer and Herschel measurements, yielded a smaller size of 458.7±9.2 km. Taking into account that Huya is a binary the diameter of the primary is estimated at 406±16 km.
Huya has a moderately red-sloped reflectance spectrum in the visible and near-infrared, suggesting a surface rich in organic material such as tholins. There is a broad absorption feature near 2 μm possibly belonging to water ice or some water-altered material. Additional absorption features may be present near 0.6–0.8 μm, which may be caused by aqueously-altered anhydrous silicates.
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