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/
Symbol	(astrological)
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 (sidereal)	125.74 yr (45926.7 d)
Mean anomaly	37.041° (M)
Mean motion	0° 0m 28.219s / 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]
Synodic 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][11]

The failed libration (resonance motion) of Amycus.

See also

• List of centaurs (small Solar System bodies) § 55576
• List of Solar System objects by size