HD 40307: Verskil tussen weergawes

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== Eienskappe ==
HD&nbsp;40307 is ’n K-tipe ster en straal dus oranje lig uit. Sy radius en massa is sowat ’n driekwart van die Son s’n. Sy temperatuur is net onder 5&nbsp;000 [[kelvin]]. Dit is relatief hoog vir ’n K-tipe ster en is naby dié van ’n G-tipe ster soos die Son.<ref>{{cite web |url=http://www.jb.man.ac.uk/distance/strobel/starprop/strpropd.htm|title=Properties of Stars |accessdate=27 November 2008 |work=Astronomy Notes|publisher=Jodrell Bank Centre for Astrophysics|year=2007|archiveurl = http://web.archive.org/web/20080622012045/http://www.jb.man.ac.uk/distance/strobel/starprop/strpropd.htm |archivedate = 22 Junie 2008|deadurlurl-status=yesdead}}</ref> Die sterrekundiges wat die planete om 40307 ontdek het, meen hul [[Metaal (astronomie)|metaalinhoud]] sal bepaal of hulle terrestriaal soos die Aarde of gasplanete soos [[Jupiter (planeet)|Jupiter]] en [[Saturnus]] is.<ref name="arXiv">{{cite journal|author= M. Mayor, S. Udry, C. Lovis, F. Pepe, D. Queloz, W. Benz, J.-L. Bertaux, F. Bouchy, C. Mordasini, D. Segransan|title=The HARPS search for southern extra-solar planets. XIII. A planetary system with 3 Super-Earths (4.2, 6.9, & 9.2 Earth masses)|journal=Submitted to Astronomy & Astrophysics|bibcode=2009A&A...493..639M|arxiv=0806.4587|doi=10.1051/0004-6361:200810451|year= 2009|volume= 493|issue= 2|pages= 639}}</ref>
 
Ondanks sy nabyheid aan die Aarde kan HD&nbsp;40307 nie met die blote oog gesien word nie.<ref>{{cite web |url=http://csep10.phys.utk.edu/astr162/lect/stars/magnitudes.html|title=Stellar Magnitudes|accessdate=20 November 2008 |work=Astrophysics 162 Unit|publisher=University of Tennessee|year=2008}}</ref>