Editing SS 433 (section)

==Observational data==
[[File:SS433LightCurve.png|thumb|A [[Photometric system#Photometric letters|visual band]] [[light curve]] for SS 433, adapted from Watarai & Fukue (2010)<ref name="Watarai"/>]]
The jets from the primary are emitted perpendicular to its [[accretion disk]]. The jets and disk [[precession|precess]] around an axis inclined about 79° to a line between Earth and SS 433. The angle between the jets and the axis is around 20°, and the precessional period is around 162.5 days.<ref name="xxx">{{cite journal|bibcode=2002SSRv..102...23C|title=Observational Manifestations of Precession of Accretion Disk in the SS 433 Binary System|journal=Space Science Reviews|volume=102|issue=1|pages=23–35|last1=Cherepashchuk|first1=Anatol|year=2002|doi=10.1023/a:1021356630889 |s2cid=115604949}}</ref>  Precession means that the jets sometimes point more towards the Earth, and sometimes more away, producing both blue and red [[Doppler shift]]s in the observed visible spectrum.<ref name="ara" /> Also, the precession means that the jets corkscrew through space in an expanding helical spray.<ref>[http://www.nrao.edu/pr/2004/ss433corkscrew/ Gigantic Cosmic Corkscrew Reveals New Details About Mysterious Microquasar], press release, [[National Radio Astronomy Observatory]], October 26, 2004, accessed on line September 14, 2007.</ref>  As they impact the surrounding [[W50 (nebula)|W50 supernova remnant]] clouds, they distort it into an elongated shape.<ref>{{cite journal|bibcode=1996PASJ...48..819M|title=Interaction of Jets with a Supernova Remnant in the SS 433/W50 System|journal=Publications of the Astronomical Society of Japan|volume=48|pages=819–825|last1=Murata|first1=Kenji|last2=Shibazaki|first2=Noriaki|year=1996|issue=6|doi=10.1093/pasj/48.6.819|doi-access=free}}</ref>
[[File:PIA24574-SS433-ULXray-20210709.jpg|thumb|left|500px|<div align="center">SS 433 - possible [[Ultraluminous X-ray source|ULX ray source]]</div>]]
Observations in 2004 by the [[Very Long Baseline Array]] for 42 consecutive days gave new data and understanding of the action of the jets. It appears that the jets are sometimes impacting material shortly after being created and thus brightening. The material the jets are impacting appears to be replaced some of the time, but not always, leading to variations in the brightening of the jets.<ref>[http://www.nrao.edu/pr/2004/ss433/ VLBA "Movie" Gives Scientists New Insights On Workings of Mysterious Microquasars], press release, [[National Radio Astronomy Observatory]], January 5, 2004. Accessed online September 14, 2007.</ref><ref>{{cite journal|bibcode=2004AAS...20510401S|title=Exploring the Jet Proper Motions of SS433|journal=American Astronomical Society Meeting Abstracts|volume=205|pages=104.01|last1=Schillemat|first1=K.|last2=Mioduszewski|first2=A.|last3=Dhawan|first3=V.|last4=Rupen|first4=M.|year=2004}}</ref>

The spectrum of SS 433 is affected not just by [[Doppler shift]]s but also by [[special relativity|relativity]]: when the effects of the Doppler shift are subtracted, there is a residual redshift which corresponds to a velocity of about 12,000 [[kilometers]] per [[second]]. This does not represent an actual velocity of the system away from the Earth; rather, it is due to [[time dilation]], which makes moving clocks appear to stationary observers to be ticking more slowly.  In this case, the relativistically moving excited atoms in the jets appear to vibrate more slowly and their radiation thus appears red-shifted.<ref name="ara">{{cite journal|last1=Margon|first1=Bruce|title=Observations of SS 433|journal=Annual Review of Astronomy and Astrophysics|volume=22|issue=1|year=1984|pages=507–536|issn=0066-4146|doi=10.1146/annurev.aa.22.090184.002451|bibcode=1984ARA&A..22..507M}}</ref>

In September 2018, A. U. Abeysekara et al. published in ''[[Nature (journal)|Nature]]'' details of investigations using the [[High Altitude Water Cherenkov Experiment|High-Altitude Water Cherenkov Gamma-Ray (HAWC) Observatory]] in [[Mexico]]. They reported teraelectronvolt γ-ray observations exceeding 25[[TeV]] of the SS 433/W50 system that spatially resolve the lobes, and consistent with a single population of electrons with energies extending to at least hundreds of teraelectronvolts in a magnetic field of about 16 micro[[gauss]].<ref>{{cite journal|doi=10.1038/s41586-018-0565-5|pmid=30283106|title=Very-high-energy particle acceleration powered by the jets of the microquasar SS 433|journal=Nature|volume=562|issue=7725|pages=82–85|year=2018|last1=Abeysekara|first1=A. U.|last2=Albert|first2=A.|last3=Alfaro|first3=R.|last4=Alvarez|first4=C.|last5=Álvarez|first5=J. D.|last6=Arceo|first6=R.|last7=Arteaga-Velázquez|first7=J. C.|last8=Avila Rojas|first8=D.|last9=Ayala Solares|first9=H. A.|last10=Belmont-Moreno|first10=E.|last11=Benzvi|first11=S. Y.|last12=Brisbois|first12=C.|last13=Caballero-Mora|first13=K. S.|last14=Capistrán|first14=T.|last15=Carramiñana|first15=A.|last16=Casanova|first16=S.|last17=Castillo|first17=M.|last18=Cotti|first18=U.|last19=Cotzomi|first19=J.|last20=Coutiño De León|first20=S.|last21=De León|first21=C.|last22=de la Fuente|first22=E.|last23=Díaz-Vélez|first23=J. C.|last24=Dichiara|first24=S.|last25=Dingus|first25=B. L.|author25-link= Brenda Dingus |last26=Duvernois|first26=M. A.|last27=Ellsworth|first27=R. W.|last28=Engel|first28=K.|last29=Espinoza|first29=C.|last30=Fang|first30=K.|display-authors=29|arxiv=1810.01892|bibcode=2018Natur.562...82A|s2cid=52918329}}</ref><ref name="2018-10-04_SD">[http://www.spacedaily.com/reports/Scientists_discover_new_nursery_for_superpowered_photons_999.html Scientists discover new nursery for superpowered photons], [[Space Daily]], 2018-10-04</ref>