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Discovery
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| Discovered by | Ignacio Ferrin |
| Discovery date | March 10, 2000 |
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Designations
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| MPC designation | 38628 Huya |
| Pronunciation | /huːˈjɑː/ hoo-YAH |
| Alternate name | 2000 EB173 |
| Minor planet category |
TNO Plutino[1][2] |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 7627.387 Gm (50.986 AU) |
| Perihelion | 4269.292 Gm (28.538 AU) |
| Semi-major axis | 5948.340 Gm (39.762 AU) |
| Eccentricity | 0.282 |
| Orbital period | 91580.694 d (250.73 a) |
| Average orbital speed | 4.63 km/s |
| Mean anomaly | 348.506° |
| Inclination | 15.463° |
| Longitude of ascending node | 169.296° |
| Argument of perihelion | 67.637° |
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Physical characteristics
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| Dimensions | 480±50 km[4] 532±25 km[5] |
| Mass | 6.5 × 1019–1.8 × 1020 kg[6] |
| Mean density | 2.0? g/cm³ |
| Equatorial surface gravity | 0.12–0.15? m/s² |
| Escape velocity | 0.23–0.28? km/s |
| Sidereal rotation period |
? d |
| Albedo | ~0.05[5] 0.11±0.02[4] |
| Temperature | ~44 K |
| Spectral type | (moderately red) B-V=1.00; V-R=0.65[7] |
| Apparent magnitude | 19.3 (opposition)[8] |
| Absolute magnitude (H) | 4.7[3] |
| Angular diameter | 0.024" (max)[9] |
38628 Huya is a trans-Neptunian object (TNO). It was discovered in March 2000 by Ignacio Ferrin and announced on 24 October 2000. It is classified as a plutino[1] with a 2:3 mean motion resonance with Neptune. With a Spitzer size estimate of 532±25 km,[5] this plutino is also a dwarf planet candidate. At around a size of 400 km, trans-Neptunian objects are expected to be spherical.[10] It was assigned the name Huya, after Juyá, the Wayuu rain god, in August 2003 by the International Astronomical Union (IAU).
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Size
At the time of its discovery, Huya was the biggest and brightest Trans-Neptunian object found since Pluto. It was found using data collected by at the CIDA Observatory in Venezuela. The Spitzer Space Telescope has estimated Huya to be about 530 km in diameter with a low albedo of around 0.05.[5]
Surface
The object has a red-sloped reflectance spectrum, suggesting a surface rich in organic material such as tholins.[11]
Pluto-like orbit
Huya is currently 28.7 AU from the Sun,[8] and will come to perihelion (q=28.52 AU) in 2015.[3] This means that this dwarf planet candidate 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 is until about July 2029.[12] 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.[1]
Plutinos (15875) 1996 TP66 and (120216) 2004 EW95 are even closer to the Sun.
Given the long orbit that TNOs have around the sun, Huya comes to opposition in early May of each year at an apparent magnitude of 19.3.[8]
Huya has been observed 131 times with precovery images back to 1996.[3]
References
- ^ a b c d Marc W. Buie (2007-04-22). "Orbit Fit and Astrometric record for 38628". SwRI (Space Science Department). http://www.boulder.swri.edu/~buie/kbo/astrom/38628.html. Retrieved 2008-07-17.
- ^ "MPEC 2009-C70 : DISTANT MINOR PLANETS (2009 FEB. 28.0 TT)". Minor Planet Center. 2009-02-10. http://www.cfa.harvard.edu/mpec/K09/K09C70.html. Retrieved 2009-03-24.
- ^ a b c d "JPL Small-Body Database Browser: 38628 Huya (2000 EB173)". 2009-06-13 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Huya. Retrieved 2008-07-17.
- ^ a b Stansberry (2005). "TNO/Centaur diameters and albedos". http://www.johnstonsarchive.net/astro/tnodiam.html. Retrieved 2006-11-08.
- ^ a b c d John Stansberry, Will Grundy, Mike Brown, Dale Cruikshank, John Spencer, David Trilling, Jean-Luc Margot (2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". University of Arizona, Lowell Observatory, California Institute of Technology, NASA Ames Research Center, Southwest Research Institute, Cornell University. http://arxiv.org/abs/astro-ph/0702538v2. Retrieved 2008-07-24.
- ^ Radius of 253 km and density of 0.97 = 6.5 × 1019 kg mass. Radius of 279 km and density of 2.0 = 1.8 × 1020 kg mass
- ^ "TNO and Centaur Colors". http://www.psi.edu/pds/asteroid/EAR_A_COMPIL_3_TNO_CEN_COLOR_V3_0/data/tnocencol.tab. Retrieved 2006-11-08.
- ^ a b c "AstDys (38628) Huya Ephemerides". Department of Mathematics, University of Pisa, Italy. http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=Huya. Retrieved 2009-03-22.
- ^ Huya Angular Size @ May 2015 Opposition: 480km dia / (27.5543AU * 149 597 870km) * 206265 = 0.024"
- ^ Mike Brown. "The Dwarf Planets". http://web.gps.caltech.edu/~mbrown/dwarfplanets/. Retrieved 2008-01-20.
- ^ Licandro (07/2001). "NICS-TNG infrared spectroscopy of trans-neptunian objects 2000 EB173 and 2000 WR106". Astronomy and Astrophysics, v.373, p.L29-L32 (2001). http://adsabs.harvard.edu/abs/2001astro.ph..5434L. Retrieved 2007-10-17.
- ^ "Horizon Online Ephemeris System". California Institute of Technology, Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=Huya. Retrieved 2009-03-23.
External links
- Orbital simulation from JPL (Java) / Ephemeris
- 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
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