IKAROS: Difference between revisions

Transmissions were again received on 22 May 2014, the spacecraft flying at a distance of about 230 million kilometers from the Earth. By May 2014, IKAROS was on a ten-month orbit around the Sun, spending seven months of each orbit in hibernation mode due to insufficient power.<ref>{{cite news |url=http://www.isas.jaxa.jp/j/topics/topics/2014/0526.shtml |title= IKAROS：3回目の冬眠モード明けについて | publisher=Japan Aerospace Exploration Agency (JAXA) |date=26 May 2014 | accessdate=8 June 2014 |language=Japanese}}</ref> By 23 April 2015, the spacecraft woke up from hibernation mode for the 4th time and was flying at a distance of about 120 million kilometers from the Earth.<ref>{{cite news |url=http://global.jaxa.jp/projects/sat/ikaros/topics.html#topics4577 |title=IKAROS wakes up from hibernation mode for the 4th time |work=[[JAXA]] |date=30 April 2015 |accessdate=24 May 2015 }}</ref> On 21 May 2015, JAXA could not receive a signal from IKAROS and concluded that the spacecraft had shifted to the hibernation mode for the fifth time, as expected. Based on May 2015 data the position of IKAROS at the time was about 110 million kilometers away from the Earth, and about 130 million kilometers from the Sun.<ref>{{cite news |url=http://global.jaxa.jp/projects/sat/ikaros/topics.html |title=IKAROS enters hibernation mode for 5th time |work=[[JAXA]] |date=29 May 2015}}</ref>

 

From the gamma-ray polarization data of GAP, Toma ''et al.''<ref>{{cite journal |title=Strict Limit on CPT Violation from Polarization of γ-Ray Bursts |author=Kenji Toma |journal=Physical Review Letters |date=December 2012 |volume=109 |issue=24 |page=241104 |doi=10.1103/PhysRevLett.109.241104 |arxiv = 1208.5288 |bibcode = 2012PhRvL.109x1104T |display-authors=etal |pmid=23368301}}</ref> puts a stricter limit on [[CPT symmetry#CPT violation|CPT violation]]. It is an improvement of eight orders of magnitude over previous limits.<ref>{{Cite journal |title=Synopsis: Distant Bursts Show no Signs of Predicted Light Rotation |journal = Physical Review Letters|volume = 109|issue = 24|pages = 241104|author=Michael Schirber |doi=10.1103/PhysRevLett.109.241104 |pmid = 23368301|bibcode = 2012PhRvL.109x1104T|year = 2012|arxiv = 1208.5288}}</ref><ref>{{cite web |url=http://www.ipmu.jp/node/1458 |title=Strict Limit on CPT Violation from Gamma-Ray Bursts |publisher=Kavli Institute for the Physics and Mathematics of the Universe |date=7 December 2012 |accessdate=16 December 2012}}</ref>