55576 Amycus

55576 Amycus /ˈæmɪkəs/ is a centaur discovered on 8 April 2002 by the NEAT at Palomar.[1]

55576 Amycus

Orbital diagram (top view)
Discovery[1]
Discovered by	NEAT
Discovery site	Palomar
Discovery date	8 April 2002
Designations
MPC designation	(55576) Amycus
Pronunciation	/ˈæmɪkəs/[2]
Named after	Amycus
Alternative designations	2002 GB10
Minor planet category	Centaur[1][3]
Adjectives	Amycian /əˈmɪsiən/
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 2
Observation arc	7204 days (19.72 yr)
Aphelion	35.019 AU (5.2388 Tm) (Q)
Perihelion	15.178 AU (2.2706 Tm) (q)
Semi-major axis	25.098 AU (3.7546 Tm) (a)
Eccentricity	0.39526 (e)
Orbital period	125.74 yr (45926.7 d)
Mean anomaly	37.041° (M)
Mean motion	0° 0^m 28.219^s / day (n)
Inclination	13.352° (i)
Longitude of ascending node	315.45° (Ω)
Argument of perihelion	239.17° (ω)
Jupiter MOID	9.92261 AU (1.484401 Tm)
TJupiter	4.133
Physical characteristics
Dimensions	76.3±12.5 km[4][5]
Rotation period	9.76 h (0.407 d)
Geometric albedo	~ 0.18[4]
Spectral type	B–V = 1.111±0.034[6] V–R = 0.705±0.032[6]
Apparent magnitude	~ 20[7]
Absolute magnitude (H)	7.8[1]

The minor planet 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.[4][5]

A low probability asteroid occultation of star UCAC2 17967364 with an apparent magnitude of +13.8 was possible on 11 February 2009.[8] Another such event involving a star with an apparent magnitude of +12.9 occurred on 10 April 2014 at about 10:46 Universal Time, visible for observers in the southwest US and western Mexico.[9]

Near 3:4 resonance of Uranus

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.[10]

The failed libration (resonance motion) of Amycus.

See also

• List of Solar System objects by size

References

1. "JPL Small-Body Database Browser: 55576 Amycus (2002 GB10)" (2007-08-15 last obs). Retrieved 12 April 2016.
2. Noah Webster (1884) A Practical Dictionary of the English Language
3. Marc W. Buie. "Orbit Fit and Astrometric record for 55576" (2003-06-22 using 73 of 81 observations). SwRI (Space Science Department). Archived from the original on 4 June 2011. Retrieved 28 February 2009.
4. John Stansberry; Will Grundy; Mike Brown; Dale Cruikshank; John Spencer; David Trilling; Jean-Luc Margot (20 February 2007). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". arXiv:astro-ph/0702538.
5. Wm. Robert Johnston (22 August 2008). "List of Known Trans-Neptunian Objects". Johnston's Archive. Archived from the original on 13 February 2009. Retrieved 28 February 2009.
6. Hainaut, O. R.; Boehnhardt, H.; Protopapa, S. (October 2012). "Colours of minor bodies in the outer solar system. II. A statistical analysis revisited". Astronomy and Astrophysics. 546: 20. arXiv:1209.1896. Bibcode:2012A&A...546A.115H. doi:10.1051/0004-6361/201219566. Retrieved 26 September 2019.
7. "AstDys (55576) Amycus Ephemerides". Department of Mathematics, University of Pisa, Italy. Archived from the original on 26 May 2011. Retrieved 15 March 2009.
8. Steve Preston (8 January 2009). "Star occultation by asteroid 55576 Amycus". IOTA (International Occultation Timing Association). Retrieved 28 December 2009.
9. 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). Cite journal requires |journal= (help)
10. Horner, J.; Evans, N.W.; Bailey, M. E. (2004). "Simulations of the Population of Centaurs I: The Bulk Statistics". Monthly Notices of the Royal Astronomical Society. 354: 798–810. arXiv:astro-ph/0407400. Bibcode:2004MNRAS.354..798H. doi:10.1111/j.1365-2966.2004.08240.x.

External links

• 55576 Amycus at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters