| 词条 | (143649) 2003 QQ47 |
| 释义 |
| minorplanet=yes | background=#FFC2E0 | name={{mp|(143649) 2003 QQ|47}} | discovery_ref= | discoverer=LINEAR | discovered=24 August 2003 | alt_names= | mp_category=NEO{{·}}PHA{{·}}Apollo | epoch=13 January 2016 (JD 2457400.5) | semimajor={{Convert|1.08538|AU|Gm|abbr=on}} | perihelion={{Convert|0.882430|AU|Gm|abbr=on}} | aphelion={{Convert|1.28834|AU|Gm|abbr=on|lk=on}} | eccentricity=0.18699 | period=1.13 yr (413.02 d) | inclination=62.1021° | asc_node=0.997990° | arg_peri=104.999° | mean_anomaly=264.755° | avg_speed=28.34 km/s | dimensions=1.2 km[2] | mass=2.0×1012 kg | rotation={{Convert|3.679|h|d|abbr=on|lk=on}} | spectral_type= | abs_magnitude=17.4[3] | albedo= | single_temperature=~267 K | mean_motion={{Deg2DMS|0.871624|sup=ms}} / day | orbit_ref=[3] | observation_arc=4285 days (11.73 yr) | uncertainty=0 | moid={{Convert|0.00253637|AU|km|abbr=on}} }}{{mp|(143649) 2003 QQ|47}}, provisional designation {{mp|2003 QQ|47}}, is a kilometer-sized asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group which became briefly notable upon its discovery in late August 2003 when media outlets played up a very preliminary report that it had a 1 in 250,000 chance of impacting into Earth on March 21, 2014.[5] Description{{mp|2003 QQ|47}} was discovered on 24 August 2003. It was added to the Sentry Risk Table on 30 August 2003.[5] By 31 August 2003 (with an observation arc of 7 days) the odds of an impact on 21 March 2014 were already reduced to 1 in 1.7 million.[2] The asteroid was removed from the Sentry Risk Table on 14 September 2003 so there is no risk of an impact by it in the next 100 years.[9]{{mp|2003 QQ|47}} safely passed {{convert|0.1283|AU|km mi|abbr=on|lk=on}} Earth on March 26, 2014.[3][11] With an observation arc of 10 years and an orbital uncertainty of 0, its orbit and future close approaches are well determined.[3]Preliminary reportsOn 3 September 2003 a NASA press release wrote, "Newly discovered asteroid {{mp|2003 QQ|47}} has received considerable media attention over the last few days because it had a small chance of colliding with the Earth in the year 2014 and was rated a "1" on the Torino Impact Hazard Scale, which goes from 0 to 10. The odds of collision in 2014, as estimated by JPL's Sentry impact monitoring system, peaked at 1 chance in 250,000, a result which was posted on our Impact Risk Page on Saturday, August 30, 2003. Impact events at the Torino Scale 1 level certainly merit careful monitoring by astronomers, but these events do not warrant public concern. In fact, each year several newly discovered asteroids reach Torino Scale 1 for a brief period after discovery; {{mp|2003 QQ|47}} is the fourth such case this year. On September 2, 2003, new measurements of {{mp|2003 QQ|47}}'s position allowed us to narrow our prediction of its path in 2014, and thus we could rule out any Earth impact possibilities for 2014."[5]{{mp|2003 QQ|47}} has a diameter of approximately 1.24 km, and a mass of approximately 2.0×1012 kg. If it were to hit the Earth, it would be a major event, with an energy of approximately 350,000 megatons of TNT (1.5 ZJ), enough to cause global damage. Sara Russell, a meteorite researcher at London's Natural History Museum, told the BBC on 2 September 2003 that she was not worried that {{mp|2003 QQ|47}} would be a danger. "The odds are very, very low... We have to keep some kind of perspective," she said.[14] As a result of the press coverage of asteroids such as {{mp|2003 QQ|47}}, astronomers are now planning to re-word the Torino scale, or to phase it out completely in favour of a scale which is less likely to generate false alarms which may reduce public confidence in genuine alerts. In fiction
References1. ^1 2 3 {{cite web |date=September 3, 2003 |title=Asteroid 2003 QQ47's Potential Earth Impact in 2014 Ruled Out |publisher=NASA/JPL Near-Earth Object Program Office |url=http://neo.jpl.nasa.gov/news/news138.html |accessdate=2011-11-06}} (K03Q47Q)[1][2][3][4][5][6]2. ^1 2 {{cite web |type=2003-09-01 (computed on Aug 31, 2003) |title=Earth Impact Risk Summary: 2003 QQ47 (Aug 31 arc=7 days) |publisher=Wayback Machine: JPL |url=http://neo.jpl.nasa.gov/risk/2003qq47.html |archiveurl=https://web.archive.org/web/20030901064133/http://neo.jpl.nasa.gov/risk/2003qq47.html |archivedate=2003-09-01 |accessdate=2013-02-03 |deadurl=no}} (5.7e-07 = 1 in 1,754,000 chance) 3. ^1 {{cite web |date=2003-09-02 |title=Asteroid danger in 2014 downplayed |publisher=BBC News |url=http://news.bbc.co.uk/2/hi/uk_news/3200019.stm |accessdate=2011-11-06}} 4. ^1 {{cite web |title=Date/Time Removed |publisher=NASA/JPL Near-Earth Object Program Office |url=http://neo.jpl.nasa.gov/risk/removed.html |accessdate=2011-05-06 |archiveurl=https://web.archive.org/web/20110426000059/http://neo.jpl.nasa.gov/risk/removed.html |archivedate=26 April 2011 |deadurl=no}} 5. ^1 2 3 4 {{cite web |type=2006-04-27 last obs |title=JPL Close-Approach Data: 143649 (2003 QQ47) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2003QQ47;cad=1#cad |accessdate=7 April 2016}} 6. ^1 {{cite web |title=NEODyS-2 Close Approaches for 2003QQ47 |publisher=Near Earth Objects - Dynamic Site |url=http://newton.dm.unipi.it/neodys/index.php?pc=1.1.8&n=2003QQ47 |accessdate=2011-11-06}} }} External links
5 : Apollo asteroids|Discoveries by LINEAR|Potentially hazardous asteroids|Asteroids removed from the Sentry Risk Table|Astronomical objects discovered in 2003 |
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