Eta2 Hydri b
{{Short description|Extrasolar planet in the constrellation Hydrus}}
{{DISPLAYTITLE:Eta2 Hydri b}}
{{Infobox planet
| name = Eta2 Hydri b
| discoverer = Setiawan et al.
| discovery_site = Chile, La Silla
| discovered = 25 May 2005
| discovery_method = Radial velocity
| apsis = astron
| semimajor = {{convert|1.93|AU|km|abbr=on}}
| eccentricity = 0.40±0.07
| period = 711±8 d
| time_periastron = 2,451,420
| arg_peri = 351.5±9.5
| semi-amplitude = 105±8
| star = Eta2 Hydri
| mass = >6.54 {{Jupiter mass|link=y}}
}}
Eta2 Hydri b (η2 Hyi b, η2 Hydri b), commonly known as HD 11977 b, is an extrasolar planet that is approximately 217 light-years away in the constellation of Hydrus. The presence of the planet around an intermediately massive giant star provides indirect evidence for the existence of planetary systems around A-type stars.
References
- {{cite journal | url=http://www.aanda.org/articles/aa/full/2005/26/aahb021/aahb021.html | last1 =Setiawan | first1=J. | title=A substellar companion around the intermediate-mass giant star HD 11977 | journal=Astronomy & Astrophysics | year=2005 | volume=437 | issue=2 | pages=L31–L34 | doi=10.1051/0004-6361:200500133 | last2=Rodmann | first2=J. | last3=Da Silva | first3=L. | last4=Hatzes | first4=A. P. | last5=Pasquini | first5=L. | last6=Von Der Lühe | first6=O. | last7=De Medeiros | first7=J. R. | last8=Döllinger | first8=M. P. | last9=Girardi | first9=L. | bibcode=2005A&A...437L..31S|arxiv = astro-ph/0505510 | s2cid =6362483 }}
External links
- {{cite web|url=http://www.mpia.de/homes/setiawan/hd11977_english.html |title=HD 11977 B, a planet around a giant star |accessdate=2008-07-03 |work=Max-Planck-Institut für Astronomie |url-status=dead |archiveurl=https://web.archive.org/web/20070314061322/http://www.mpia.de/homes/setiawan/hd11977_english.html |archivedate=March 14, 2007 }}
- {{cite encyclopedia |url=https://exoplanet.eu/catalog/hd_11977_b--285/ |title=Notes for planet HD 11977 b |access-date=2008-07-03 |encyclopedia=Extrasolar Planets Encyclopaedia |date= }}
{{Sky|01|54|56|-|67|38|50|216.89}}
{{Hydrus}}
{{Authority control}}
{{DEFAULTSORT:Eta2 Hydri b}}
Category:Exoplanets discovered in 2005
Category:Exoplanets detected by radial velocity
{{extrasolar-planet-stub}}