Editing Solar radius (section)

== Nominal solar radius ==

In 2015, the [[International Astronomical Union]] passed Resolution B3, which defined a set of nominal conversion constants for stellar and planetary [[astronomy]]. Resolution B3 defined the ''nominal solar radius'' (symbol <math>R^{N}_{\odot}</math>) to be equal to ''exactly'' {{val|695700|u=km}}.<ref name=IAU2015resB3>{{citation | first1=E.E. | last1=Mamajek | first2=A. | last2=Prsa | first3=G. | last3=Torres | first4=al. | last4=et | title=IAU 2015 Resolution B3 on Recommended Nominal Conversion Constants for Selected Solar and Planetary Properties | arxiv=1510.07674 |bibcode = 2015arXiv151007674M | year=2015 }}</ref> The nominal value, which is the rounded value, within the uncertainty, given by Haberreiter, Schmutz & Kosovichev (2008), was adopted to help astronomers avoid confusion when quoting stellar radii in units of the Sun's radius, even when future observations will likely refine the Sun's actual photospheric radius (which is currently<ref name=Mef2018>{{citation | first1 = M | last1=Meftah | first2=T | last2=Corbard | first3=A. | last3=Hauchecorne | first4=F. | last4=Morand | first5=R. | last5=Ikhlef | first6=B. | last6=Chauvineau | first7=C. | last7=Renaud | first8=A. | last8=Sarkissian | first9=L. | last9=Damé | title=Solar radius determined from PICARD/SODISM observationsand extremely weak wavelength dependence in the visibleand the near-infrared | journal=Astronomy & Astrophysics | volume=616 | pages=A64 | doi=10.1051/0004-6361/201732159 | bibcode=2018A&A...616A..64M | year=2018 | doi-access=free }}</ref> only known to about an accuracy of ±{{val|100|-|200|u=km}}).