K2-18b: Perbedaan antara revisi

K2-18b mengorbit K2-18 pada jarak sekitar 0,1429 AU (21,38 juta km).<ref>{{Cite journal|last=Yurchenko|first=Sergey N.|last2=Tennyson|first2=Jonathan|last3=Tinetti|first3=Giovanna|last4=Waldmann|first4=Ingo P.|last5=Tsiaras|first5=Angelos|date=2019-09-11|year=|title=Water vapour in the atmosphere of the habitable-zone eight Earth-mass planet K2-18 b|url=https://arxiv.org/abs/1909.05218v1|journal=|language=en|volume=|issue=|pages=|arxiv=1909.05218|bibcode=2019arXiv190905218T|doi=10.1038/s41550-019-0878-9}}</ref> Eksoplanet ini memiliki periode orbit 33 hari.<ref>{{Cite web|url=https://www.space.com/alien-planet-k2-18b-water-vapor-not-earth-twin.html|title=The Water Vapor Find on 'Habitable' Exoplanet K2-18 b Is Exciting — But It's No Earth Twin|last=Life|first=Mike Wall 2019-09-11T17:43:05Z Search for|website=Space.com|language=en|access-date=2019-09-14}}</ref><ref>{{Cite journal|last=Benneke|first=Björn|last2=Werner|first2=Michael|last3=Petigura|first3=Erik|last4=Knutson|first4=Heather|last5=Dressing|first5=Courtney|last6=Crossfield|first6=Ian J. M.|last7=Schlieder|first7=Joshua E.|last8=Livingston|first8=John|last9=Beichman|first9=Charles|date=2017-01-12|year=|title=SPITZER OBSERVATIONS CONFIRM AND RESCUE THE HABITABLE-ZONE SUPER-EARTH K2-18b FOR FUTURE CHARACTERIZATION|url=http://stacks.iop.org/0004-637X/834/i=2/a=187?key=crossref.4113758b730f2803a70374cfb05d99cd|journal=The Astrophysical Journal|volume=834|issue=2|pages=187|arxiv=1610.07249|bibcode=2017ApJ...834..187B|doi=10.3847/1538-4357/834/2/187|issn=1538-4357}}</ref> Suhu permukaan eksoplanet ini diperkirakan sekitar 265 ± 5 K (−8 ± 5 &nbsp;° C).<ref name=":0" /> K2-18b diperkirakan memiliki radius 2,71 ± 0,07 ''R''_⊕ dan massa 8,63 ± 1,35 M_⊕, berdasarkan analisis menggunakan HARPS dan CARMENES.<ref name=":0" />

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