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38628 Huya

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38628 Huya
38628 Huya.png
Artist's impression of Huya
Discovered byIgnacio Ferrin
Discovery timeMarch 10, 2000
Name38628 Huya
Other names2000 EB173
Reference date December 31, 2006 (JD 2454100.5)
Longest distance from the Sun7627.387 Gm (50.986 AU)
Shortest distance from the Sun4269.292 Gm (28.538 AU)
Longest distance from the center of its orbital path
("semi-major axis")
5948.340 Gm (39.762 AU)
How egg-shaped its orbit is
How long it takes to complete an orbit91580.694 d (250.73 a)
Average speed4.63 km/s
Mean anomaly348.506°
Angle above the reference plane
Longitude of where it comes up through the reference plane169.296°
Angle between its shortest distance from what it orbits around and where it comes up through the reference plane
("argument of periapsis")
Size and Other Qualities
Measures480±50 km[4]
532±25 km[5]
Mass6.5×1019–1.8×1020 kg[6]
Average density2.0? g/cm³
Gravity at its surface0.12–0.15? m/s²
Slowest speed able to escape into space
("escape velocity")
0.23–0.28? km/s
How long it takes to turn around one time
(in relation to the stars)
? d
How much light it reflects0.11±0.02[4]
Avg. surface temp.~44 K
Light-band group
("spectral type")
(moderately red) B-V=1.00; V-R=0.65[7]
Seeming brightness
("apparent magnitude")
19.3 (opposition)
True brightness
("absolute magnitude")
Seeming size
("angular diameter")
0.024" (max)[8]

38628 Huya, previously known by its provisional designation 2000 EB173) is a trans-Neptunian object (TNO). It was found in March 2000 by Ignacio Ferrin and announced on 24 October 2000. It was given the name Huya, after Juyá, the Wayuu rain god, in August 2003 by the International Astronomical Union (IAU).


At the time when it was found, Huya was the biggest and brightest TNO yet found. It was found using data collected by at the CIDA Observatory in Venezuela. Astronomers think it's about 530 km in diameter.[5]


The object has a red-sloped reflectance spectrum, saying that the surface could be rich in organic material such as tholins.[9]


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.


  1. 1.0 1.1 Marc W. Buie (2007-04-22). "Orbit Fit and Astrometric record for 38628". SwRI (Space Science Department). Retrieved 2008-07-17.
  2. "MPEC 2006-X45 : Distant Minor Planets". Minor Planet Center & Tamkin Foundation Computer Network. 2006-12-21. Retrieved 2008-07-18.
  3. 3.0 3.1 "JPL Small-Body Database Browser: 38628 Huya (2000 EB173)". 2007-05-12 last obs. Retrieved 2008-07-17.
  4. 4.0 4.1 Stansberry (2005). "TNO/Centaur diameters and albedos". Retrieved 2006-11-08.
  5. 5.0 5.1 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. Retrieved 2008-07-24.
  6. 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
  7. "TNO and Centaur Colors". Retrieved 2006-11-08.
  8. Huya Angular Size @ May 2015 Opposition: 480km dia / (27.5543AU * 149 597 870km) * 206265 = 0.024"
  9. 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). Retrieved 2007-10-17.

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