Changes

| parallax        =196.72 ± 0.83 mas<ref name=simbad/><ref name=hip/>

| parallax        =196.72 ± 0.83 mas<ref name=simbad/><ref name=hip/>

}}

}}

'''70 Ophiuchi''' (70 Oph, P Oph, HIP 88601) is a [[binary star]] in the [[constellation]] of [[Ophiuchus]].<ref name=illinois>{{cite web|url=http://stars.astro.illinois.edu/sow/70oph.html|title=70 Ophiuchi|accessdate=July 16, 2020|publisher=stars.astro.illinois.edu|author=Jim Kaler|date=September 13, 2003|work=Stars}}</ref> [[William Herschel]] is known to have observed the pair in August 1779 but creditted Christian Mayer as having discovered this earlier.<ref name=solstation>{{cite web|url=http://www.solstation.com/stars/70ophiu2.htm|title=70 Ophiuchi 2?|accessdate=July 16, 2020|publisher=solstation.com}}</ref> At a distance of roughly 16 [[light year]]s, it is the 51^st closest star to [[Earth]]. In fact it is so close, that the two stars can easily be resolved with a telescope or [[magnification]] larger than x75 and can be observed to complete one [[orbit]] every 90 years, one of the few star systems where this can be observed in a human lifetime.<ref name=cosmicpursuits>{{cite web|url=https://cosmicpursuits.com/2245/70-ophiuchi/|title=A Speedy Little Double Star|accessdate=July 16, 2020|publisher=cosmicpursuits.com|author=Nicole Aniston|date=September 06, 2018}}</ref> The brighter primary star can be observed to have a yellow-golden color whereas the fainter secondary has a orange-red appearance.

'''70 Ophiuchi''' (70 Oph, P Oph, HIP 88601) is a [[binary star]] in the [[constellation]] of [[Ophiuchus]].<ref name=illinois>{{cite web|url=http://stars.astro.illinois.edu/sow/70oph.html|title=70 Ophiuchi|accessdate=July 16, 2020|publisher=stars.astro.illinois.edu|author=Jim Kaler|date=September 13, 2003|work=Stars}}</ref> [[William Herschel]] is known to have observed the pair in August 1779 but credited Christian Mayer as having discovered this earlier.<ref name=solstation>{{cite web|url=http://www.solstation.com/stars/70ophiu2.htm|title=70 Ophiuchi 2?|accessdate=July 16, 2020|publisher=solstation.com}}</ref> At a distance of roughly 16 [[light year]]s, it is the 51^st closest star to [[Earth]]. In fact it is so close, that the two stars can easily be resolved with a telescope or [[magnification]] larger than x75 and can be observed to complete one [[orbit]] every 90 years, one of the few star systems where this can be observed in a human lifetime.<ref name=cosmicpursuits>{{cite web|url=https://cosmicpursuits.com/2245/70-ophiuchi/|title=A Speedy Little Double Star|accessdate=July 16, 2020|publisher=cosmicpursuits.com|author=Nicole Aniston|date=September 06, 2018}}</ref> The brighter primary star can be observed to have a yellow-golden color whereas the fainter secondary has a orange-red appearance.

==Properties and structure==

==Properties and structure==

The 70 Ophiuchi system is located 16.58 [[light year]]s from Earth.<ref name=universeguide/> The two stars are both K class yellow-orange dwarf stars and orbit each other with a period of 88.05 years and a mean seperation of 23.3 [[Astronimical units]] (or 2 to 7 seconds af arc as seen from Earth).<ref name=britannica>{{cite web|url=https://www.britannica.com/science/star-astronomy/Bulk-stellar-properties#ref510334|title=Bulk stellar properties Stellar temperatures|accessdate=July 16, 2020|publisher=britannica.com}}</ref><ref>

The 70 Ophiuchi system is located 16.58 [[light year]]s from Earth.<ref name=universeguide/> The two stars are both K class yellow-orange dwarf stars and orbit each other with a period of 88.05 years and a mean separation of 23.3 [[Astronomical unit]]s (or 2 to 7 seconds of arc as seen from Earth).<ref name=britannica>{{cite web|url=https://www.britannica.com/science/star-astronomy/Bulk-stellar-properties#ref510334|title=Bulk stellar properties Stellar temperatures|accessdate=July 16, 2020|publisher=britannica.com}}</ref><ref>

{{cite journal

{{cite journal

  |last1=Batten |first1=A. H.

  |last1=Batten |first1=A. H.

  |ref=harv

  |ref=harv

}}

}}

</ref> However, more recent studies suggest this was in error and that there are no masses larger than four Jupiter massess within 5.2&nbsp;AU of either star.<ref name=solstation/><ref>

</ref> However, more recent studies suggest this was in error and that there are no masses larger than four Jupiter masses within 5.2&nbsp;AU of either star.<ref name=solstation/><ref>

{{cite journal

{{cite journal

  |last1=Wittenmyer |first1=Robert A.

  |last1=Wittenmyer |first1=Robert A.