| 词条 | List of space debris producing events | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 |
Major contributors to space debris include the explosion of upper stages and satellite collisions.[1] There were 190 known satellite breakups between 1961 and 2006.[1] By 2015, the total had grown to 250 on-orbit fragmentation events.[2] {{asof|2012}} there were an estimated 500,000 pieces of debris in orbit,[3] with 300,000 pieces below 2000 km (LEO).[1] Of the total, about 20,000 are tracked.[4] Also, about sixteen old Soviet nuclear space reactors are known to have released an estimated 100,000 liquid metal (NaK) droplets 800–900 km up,[5] which range in size from 1 – 6 cm.[5]The greatest risk to space missions is from untracked debris between 1 and 10 cm in size.[4] Large pieces can be tracked and avoided, and impact from smaller pieces are usually survivable.[4]
Recent eventsOn 3 February 2015, the 13th DMSP satellite of the US government—DMSP-F13, launched in 1995—exploded while in a Sun-synchronous polar orbit leaving a debris field of at least 43 objects. The US Air Force Joint Space Operations Center at Vandenberg Air Force Base, California is monitoring the expanding debris field, and "will issue conjunction warnings if necessary."[7] References1. ^AN ANALYSIS OF RECENT MAJOR BREAKUPS IN THE LOW EARTH ORBIT REGION 2. ^{{cite web |title=ESA Experts Assess Risk from Exploded Satellite |url=http://www.esa.int/Our_Activities/Space_Engineering_Technology/Clean_Space/ESA_experts_assess_risk_from_exploded_satellite |website=http://www.esa.int/Our_Activities/Space_Engineering_Technology/Clean_Space/ |publisher=ESA |accessdate=5 March 2015 }} 3. ^{{cite web|url=http://stratrisks.com/geostrat/9353|title=DARPA wants army of networked amateur astronomers to watch sky for space junk, aliens|date=2012-11-14|archive-url=https://web.archive.org/web/20121119052141/http://stratrisks.com/geostrat/9353|archive-date=2012-11-19|work=Stratrisks}} 4. ^1 2 3 4 The Threat of Orbital Debris and Protecting NASA Space Assets from Satellite Collisions (2009) 5. ^1 IEEE – The Growing Threat of Space Debris {{webarchive|url=https://web.archive.org/web/20130127022215/http://www.todaysengineer.org/2009/jul/space_debris.asp |date=2013-01-27 }} 6. ^{{Cite journal|last=Meador|first=P. Anz|date=April 2016|title=Top Ten Satellite Breakups Reevaluated|url=http://orbitaldebris.jsc.nasa.gov/Quarterly-News/newsletter.html|journal=Orbital Debris Quarterly News|volume=20|issue=1 & 2|doi=|pmid=|access-date=May 1, 2016|via=}} 7. ^{{cite news |last1=Berger|first1=Brian |last2=Gruss|first2=Mike |title=20-year-old Military Weather Satellite Apparently Exploded in Orbit |url=http://spacenews.com/20-year-old-military-weather-satellite-apparently-exploded-in-orbit/ |accessdate=28 February 2015 |work=Space News |date=27 February 2015 }} 3 : Satellite collisions|Space debris|Space lists |
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