| 词条 | 2011 GA |
| 释义 |
|minorplanet = yes |background = #FFC2E0 |name = {{mp|2011 GA|}} |symbol = |image = |caption = |discovery_ref = [1] |discoverer = Mount Lemmon Survey |discovered = April 1, 2011 |discovery_site = Catalina Mountains north of Tucson, Arizona, USA |mpc_name = 2011 GA |mp_category = {{mpcat|Apollo}} NEO, PHA |alt_names = MPO 200327 |orbit_ref = [2] |epoch = 13 January 2016 (JD 2457400.5) |uncertainty = 5 |observation_arc = 70 d |aphelion = {{Convert|2.8692|AU|Gm|abbr=on|lk=on}} |perihelion = {{Convert|0.73727|AU|Gm|abbr=on}} |semimajor = {{Convert|1.80321|AU|Gm|abbr=on}} |eccentricity = 0.59114 |period = 2.42 yr (884.44 d) |avg_speed = |inclination = 9.8282° |asc_node = 200.4246° |mean_anomaly = 305.631° |arg_peri = 109.750° |satellites = |moid = {{Convert|0.00686464|AU|km|abbr=on}} |mercury_moid = |dimensions = 170–380 m[3] |sidereal_day = |axial_tilt = |pole_ecliptic_lat = |pole_ecliptic_lon = |albedo = |temp_name1 = |mean_temp_1 = |max_temp_1 = |temp_name2 = |max_temp_2 = |spectral_type = |abs_magnitude = 21.0[2] |mean_motion = {{Deg2DMS|0.407036|sup=ms}} /day |jupiter_moid = {{Convert|2.51622|AU|Gm|abbr=on}} }} {{mp|2011 GA|}} is a small asteroid that is a Near-Earth object and an Apollo asteroid. OrbitThe orbit of {{mp|2011 GA|}} makes it a Potentially Hazardous Asteroid (PHA) that is predicted to pass within {{convert|0.02|AU|km mi|abbr=on|lk=on}} of the Earth on Oct 14, 2023.[4] For comparison, the distance to the Moon is about 0.0026 AU (384,400 km). The asteroid passed within {{convert|0.06|AU|km mi|abbr=on|lk=on}} from Earth around October 15, 1977. The Jupiter Tisserand invariant, used to distinguish different kinds of orbits, is 3.821.[2] See also
References1. ^{{cite web|title=2011 GA|url=http://www.minorplanetcenter.net/db_search/show_object?utf8=%E2%9C%93&object_id=2011+GA|publisher=Minor Planet Center|date=2011-06-10}} 2. ^1 2 {{cite web|type=last observation: 2011-06-10; arc: 70 days|title=JPL Small-Body Database Browser: (2011 GA)|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011%20GA|publisher=Jet Propulsion Laboratory|accessdate=31 March 2016}} 3. ^{{cite web|title=ABSOLUTE MAGNITUDE (H)|url=http://neo.jpl.nasa.gov/glossary/h.html|publisher=NASA}} 4. ^{{cite web|title=JPL Small-Body Database Browser: (2011 GA) – Close-Approach Data|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011GA;cad=1#cad|publisher=Jet Propulsion Laboratory|accessdate=2015-05-05}} External links
5 : Apollo asteroids|Minor planet object articles (unnumbered)|Earth-crosser asteroids|Potentially hazardous asteroids|Astronomical objects discovered in 2011 |
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