55576 Amycus

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55576 Amycus.tiff
Orbital diagram (top view)
Discovery[1] and designation
Discovered by NEAT
Discovery site Palomar
Discovery date 2002-04-08
MPC designation 55576 Amycus
Named after
2002 GB10
Adjectives Amycian
Orbital characteristics[1]
Epoch November 30, 2008
Aphelion 35.092 AU (Q)
Perihelion 15.205 AU (q)
25.149 AU (a)
Eccentricity 0.39539
126.12 yr
16.515° (M)
Inclination 13.336 °
Physical characteristics
Dimensions 76.3 ± 12.5 km[3][4]

55576 Amycus /ˈæmɨkəs/, provisionally known as 2002 GB10, is a centaur discovered on April 8, 2002, by the NEAT at Palomar.[1]

55576 Amycus was named for Amycus, a male centaur in Greek mythology.

It came to perihelion in February 2003.[1]

Data from the Spitzer Space Telescope gave a diameter of 76.3 ± 12.5 km.[3][4]

A low probability asteroid occultation of star UCAC2 17967364 with an apparent magnitude of +13.8 was possible on February 11, 2009.[6]

A low probability asteroid occultation of a star with an apparent magnitude of +12.9 will occur 2014 April 10 about 10h 46m Universal Time, visible for observers in the southwest USA and western Mexico.[7]

Near 3:4 resonance of Uranus[edit]

Amycus (2002 GB10) lies within 0.009 AU of the 3:4 resonance of Uranus and is estimated to have a long orbital half-life of about 11.1 Myr.[8]

It has been observed 76 times over 19 years and has an orbit quality code of 2.[1]

The failed libration (resonance motion) of Amycus.


  1. ^ a b c d e f g "JPL Small-Body Database Browser: 55576 Amycus (2002 GB10)" (2007-08-15 last obs). Retrieved 2009-02-28. 
  2. ^ Marc W. Buie. "Orbit Fit and Astrometric record for 55576" (2003-06-22 using 73 of 81 observations). SwRI (Space Science Department). Retrieved 2009-02-28. 
  3. ^ a b c John Stansberry; Will Grundy; Mike Brown; Dale Cruikshank; John Spencer; David Trilling; Jean-Luc Margot (2007-02-20). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". arXiv:astro-ph/0702538 [astro-ph].
  4. ^ a b Wm. Robert Johnston (22 August 2008). "List of Known Trans-Neptunian Objects". Johnston's Archive. Archived from the original on 13 February 2009. Retrieved 2009-02-28. 
  5. ^ "AstDys (55576) Amycus Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2009-03-15. 
  6. ^ Steve Preston (2009-01-08). "Star occultation by asteroid 55576 Amycus". IOTA (International Occultation Timing Association). Retrieved 2009-12-28. [dead link]
  7. ^ Hans-J. Bode; Filipe Braga Ribas; B. Sicardy (2013). "Bright Star Occultations by TNOs in 2014. J. Occultation Astronomy 2014-1.". IOTA (International Occultation Timing Association). 
  8. ^ Horner, J.; Evans, N.W.; Bailey, M. E. (2004). "Simulations of the Population of Centaurs I: The Bulk Statistics". arXiv:astro-ph/0407400 [astro-ph].

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