Astronomy:2011 GA

2011 GA

Discovery
Discovered by	Mount Lemmon Survey
Discovery site	Catalina Mountains north of Tucson, Arizona, USA
Discovery date	April 1, 2011
Designations
MPC designation	2011 GA
Alternative designations	MPO 200327
Minor planet category	Apollo NEO, PHA
Orbital characteristics
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 5
Observation arc	70 d
|{{{apsis}}}|helion}}	2.8692 astronomical unit|AU (429.23 Gm)
|{{{apsis}}}|helion}}	0.73727 AU (110.294 Gm)
Semi-major axis	1.80321 AU (269.756 Gm)
Eccentricity	0.59114
Orbital period	2.42 yr (884.44 d)
Mean anomaly	305.631°
Mean motion	0° 24m 25.33s /day
Inclination	9.8282°
Longitude of ascending node	200.4246°
|{{{apsis}}}|helion}}	109.750°
Earth MOID	0.00686464 AU (1,026,936 km)
Jupiter MOID	2.51622 AU (376.421 Gm)
Physical characteristics
Dimensions	170–380 m
Absolute magnitude (H)	21.0

2011 GA is a small asteroid that is a Near-Earth object and an Apollo asteroid.

Orbit

The orbit of 2011 GA makes it a potentially hazardous asteroid (PHA) that is predicted to pass within 0.02 astronomical unit|AU (3,000,000 km; 1,900,000 mi) of the Earth on Oct 14, 2023. For comparison, the distance to the Moon is about 0.0026 AU (384,400 km). The asteroid passed within 0.06 astronomical unit|AU (9,000,000 km; 5,600,000 mi) from Earth around October 15, 1977.

The Jupiter Tisserand invariant, used to distinguish different kinds of orbits, is 3.821.

See also

• 99942 Apophis

External links

• 2011 GA at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• 2011 GA at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• 2011 GA at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters