Artist's impression of 38628 Huya
|Discovery and designation|
|Discovered by||Ignacio Ferrin|
|Discovery date||March 10, 2000|
|MPC designation||38628 Huya|
|Epoch January 4, 2010 (JD 2455200.5)|
|Aphelion||50.363 AU (7534 Gm)|
|Perihelion||28.520 AU (4266 Gm)|
|39.442 AU (5900 Gm)|
|247.72 yr (90477 d)|
Average orbital speed
Sidereal rotation period
|0.081 ± 0.011|
|B−V=0.95 ± 0.05
V−R=0.57 ± 0.09
|5.14 ± 0.07
5.37 ± 0.04 
|0.024″ (max)[note 1]|
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, which shows only small deviations, suggests that it is likely a spheroid with small albedo spots. As of 2010, astronomer Gonzalo Tancredi thought that Huya was very probably a dwarf planet.
It was discovered in March 2000 by Ignacio Ferrin and announced on 24 October 2000. It was assigned the name Huya, after Juyá the Wayuu rain god, in August 2003 by the International Astronomical Union (IAU).
A satellite, reported in IAU Circular 9253 on 12 July 2012, was discovered by K. S. Noll, W. M. Grundy, H. Schlichting, R. Murray-Clay and S. D. Benecchi from Hubble Space Telescope observations obtained on 6 May 2012 and confirmed in reexamination of Hubble Space Telescope imagery from 30 June-1 July 2012. It has an estimated diameter of 210±30 km and a separation of 1,800 kilometres (1,100 mi) from primary.
At the time of its discovery, Huya was the biggest and brightest trans-Neptunian object found since Pluto. It was found using data collected at the CIDA Observatory in Venezuela.
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 estimate of 438.7+26.5
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.
Orbit and rotation
Huya is currently 28.5 AU from the Sun and will come to perihelion in December 2014. This means that it is currently inside the orbit of the planet Neptune. Like Pluto, this plutino spends part of its orbit closer to the Sun than Neptune, even though their orbits are controlled by Neptune. Huya will be closer to the Sun than Neptune until about July 2029. Simulations by the Deep Ecliptic Survey (DES) show that, over the next 10 million years, Huya can acquire a perihelion distance (qmin) as small as 27.28 AU. Plutinos (15875) 1996 TP66 and (120216) 2004 EW95 get even closer to the Sun.
Huya has been observed 131 times, with precovery images back to 1996. The rotation period of Huya is unknown: although a value of 13.50 hours has been tentatively obtained from fragmentary light curve data, it may well be completely erroneous.
- Huya Angular Size at May 2015 Opposition: 480km dia / (27.5543AU * 149 597 870km) * 206265 = 0.024″
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- 37th DPS: Albedos, Diameters (and a Density) of Kuiper Belt and Centaur Objects
- Planet 10? Tiny 'Plutino' Almost Qualifies
- Discovery of a bright Trans-Neptunian Object (Yale)
- From the Rain Forest to Planet Huya