| 词条 | (276033) 2002 AJ129 |
| 释义 |
| minorplanet = yes | background = #FFC2E0 | name = {{mp|(276033) 2002 AJ|129}} | image = 2002 AJ129-orbit (multilingual).svg | image_size = 250 | caption = The orbit is highly elliptical, moving outside Mars and inside Mercury. Positions shown for Jan 31, 2018 before flyby. | discovery_ref = [1][2] | discoverer = NEAT | discovery_site = Haleakala Obs. | discovered = 15 January 2002 | mpc_name = (276033) {{mp|2002 AJ|129}} | alt_names = {{mp|2002 AJ|129}} | pronounced = | named_after = | mp_category = {{nowrap|Apollo{{·}}NEO{{·}}PHA [2]}} Mercury-crosser Venus-crosser | orbit_ref = [6] | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 14.23 yr (5,199 days) | aphelion = 2.6254 AU | perihelion = 0.1167 AU | semimajor = 1.3711 AU | eccentricity = 0.9149 | period = 1.61 yr (586 days) | mean_anomaly = 288.23° | mean_motion = {{Deg2DMS|0.6139|sup=ms}} / day | inclination = 15.449° | asc_node = 138.05° | arg_peri = 211.01° | moid = 0.0060 AU (2.3 LD) | mean_diameter = 0.5–1.2 km[7] | rotation = | albedo = | spectral_type = | abs_magnitude = 18.7 }}{{mp|(276033) 2002 AJ|129}}, provisional designation {{mp|2002 AJ|129}}, is a Mercury-crossing asteroid. It has the ninth-smallest perihelion of all numbered asteroids, after asteroids such as {{mpl-|137924|2000 BD|19}}, {{mpl-|374158|2004 UL}}, and {{mpl-|386454|2008 XM}}.[9] It makes close approaches to all of the inner planets and asteroid 4 Vesta.[11] The asteroid is estimated to be between {{convert|0.5|-|1.2|km|mi|sigfig=1|sp=us}} across.[7] In January 2018 there was much media hype about this asteroid being classified as a potentially hazardous asteroid, although there is no known threat of an impact for hundreds if not thousands of years. The media has compared the size of the asteroid to the Burj Khalifa in Dubai.[13] Description{{mp|2002 AJ|129}} was discovered on 15 January 2002, by astronomers of the NEAT team at Haleakala Observatory, Hawaii, United States.[1][2] It was removed from the Sentry Risk Table on 3 February 2002.[16]It is a Mercury-, Venus-, Earth- and Mars-crossing asteroid. With an observation arc of 14 years, it has a well determined orbit and was last observed in 2016. It is classified as an Apollo asteroid because it is a near-Earth asteroid with a semi-major axis larger than Earth's. It is also categorized as a potentially hazardous asteroid, but that does not mean there is a near-term threat of an impact. It is a potentially hazardous asteroid merely as a result of its size (absolute magnitude {{nowrap|H ≤ 22}}) and Earth minimum orbit intersection distance {{nowrap|(Earth MOID ≤ 0.05 AU}}). 2018 approachOn 4 February 2018 at 21:31 UT, the asteroid passed about {{convert|0.028126|AU|km mi|abbr=on}} from Earth.[21] The 2018 Earth approach distance was known with a 3-sigma accuracy of ±200 km. Goldstone is scheduled to observe the asteroid from 3–6 February.[23] By 4 February 2018 11:00 UT, the asteroid brightened to apparent magnitude 14 and had a solar elongation of more than 100°.[24] 2172 approachOn 8 February 2172, the asteroid will pass about {{convert|0.00458|AU|km mi|abbr=on}} from Earth. The 2172 Earth approach distance is known with a 3-sigma accuracy of ±4000 km. As we look even further into the future the known trajectory becomes more divergent. By the Earth approach of {{convert|0.24|AU|km mi|abbr=on}} on 19 February 2196 the uncertainty increases to ±2.4 million km. {{Large_near_earth_asteroid_flybys 2LD}}References1. ^1 2 3 {{cite web |title = 276033 (2002 AJ129) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=276033 |accessdate = 8 February 2018}} [1][2][3][4][5][6][7][8][9][10][11]2. ^1 AstDys-2 Retrieved 2011 September 13 3. ^1 2 NeoDys-2 Retrieved 2011 September 13 4. ^1 NEODyS-2 Close approaches 5. ^1 List of asteroids with q<0.3075 AU generated by the JPL Small-Body Database Search Engine Retrieved 2011 September 10 6. ^1 2 {{cite web |title=MPEC 2002-B14 : 2002 AJ129 |publisher=IAU Minor Planet Center |date=2002-01-19 |url=https://www.minorplanetcenter.net/mpec/K02/K02B14.html |accessdate=2018-01-19}} (K02AC9J) 7. ^1 {{Cite web |url=http://neo.jpl.nasa.gov/risk/removed.html |title=NEOs Removed from Impact Risks Tables |archive-url=https://web.archive.org/web/20020602101400/http://neo.jpl.nasa.gov/risk/removed.html |archive-date=2 June 2002 |df=dmy-all }} 8. ^1 {{cite web|title=A 'potentially hazardous' asteroid bigger than Burj Khalifa is about to fly near our planet|url=http://www.businessinsider.com/potentially-dangerous-near-earth-object-asteroid-2002-aj129-2018-1|publisher=Business Insider|accessdate=January 19, 2018}} 9. ^1 {{cite web |date=2018-02-01 |title=Goldstone Radar Observations Planning: Asteroids 2002 AJ129, 2014 SR339, and 2015 BN509 |publisher=NASA/JPL Asteroid Radar Research |author=Dr. Lance A. M. Benner |url=https://echo.jpl.nasa.gov/asteroids/2002AJ129/2002AJ129_planning.2018.html |accessdate=2018-02-03}} 10. ^1 {{cite web |title = Asteroid 2002 AJ129 to Fly Safely Past Earth February 4 [2018] |work = NASA/Jet Propulsion Laboratory |date = 19 January 2018 |url = https://www.jpl.nasa.gov/news/news.php?feature=7042 |accessdate = 8 February 2018}} 11. ^1 {{cite web |title=(276033) 2002AJ129 Ephemerides for February 2018 |publisher=NEODyS (Near Earth Objects – Dynamic Site) |url=http://newton.dm.unipi.it/neodys2/index.php?pc=1.1.3.1&n=276033&oc=500&y0=2018&m0=2&d0=1&h0=0&mi0=0&y1=2018&m1=2&d1=10&h1=0&mi1=0&ti=12.0&tiu=hours |accessdate=2018-02-03}} }} External links{{Commons category|2002 AJ129}}
9 : Apollo asteroids|Discoveries by NEAT|Earth-crosser asteroids|Mercury-crossing asteroids|Venus-crosser asteroids|Potentially hazardous asteroids|Astronomical objects discovered in 2002|Near-Earth objects in 2018|Asteroids removed from the Sentry Risk Table |
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