HD 102956 b
{{Short description|Extrasolar planet in the constellation Ursa Major}}
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{{Infobox planet
| name = HD 102956 b / Isagel
| image = File:Artistic impression of HD102956.png
| caption = Artist's impression HD 102956 b
| discoverer = Johnson et al.
| discovery_site = Keck Observatory
| discovered = 2010
| discovery_method = Doppler spectroscopy
| semimajor = {{val|0.0807|0.0073|ul=AU}}
| eccentricity = {{val|0.037|0.019}}
| period = {{val|6.49470|0.00019|u=days}}
| time_periastron = {{val|2455351.45|0.64|ul=JD}}
| arg_peri = {{val|301|33|u=º}}
| semi-amplitude = {{val|74.6|1.8|ul=m/s}}
| star = HD 102956
| mass = {{val|0.960|0.023|p=≥|ul=Jupiter mass}}
}}
{{Starbox begin
| name = HD 102956
}}
{{Starbox observe
| epoch = J2000
| constell = Ursa Major
| dec = {{dec|+57|38|26.6427}}
}}
{{Starbox character
| type = Main sequence
| class = A
}}
{{Starbox astrometry
| radial_v = {{val|-25|83}}
| prop_mo_ra = {{val|−11.24|0.049}}
| prop_mo_dec = {{val|−17.578|0.049}}
| parallax = 8.1753
| p_error = 0.0290
| absmag_v = {{val|2.5}}
}}
{{Starbox detail
| mass = {{val|1.68|0.11}}
| radius = {{val|4.4|0.1}}
| luminosity_visual = {{val|11.6|0.5}}
| temperature = {{val|5054|44}}
| metal_fe = {{val|+0.19|0.04}}
| rotational_velocity = 0.30
}}
{{Starbox catalog
| names = {{odlist | 2MASS=J11512253+5738267 | BD=+58 1340 | HIP=57820 | SAO=28161 | TYC=3839-00846-1 }}
}}
{{Starbox reference
| Simbad = HD+102956
| NSTED = HD102956
}}
{{Starbox end}}
HD 102956 b or Isagel is an extrasolar planet discovered in 2010 by a team of American astronomers led by John Johnson using Doppler spectroscopy and the Keck Observatory in Hawaii. HD 102956 b is in the orbit of host star HD 102956. The planet is at least the mass of Jupiter, orbiting every 6.5 days at a distance of 12 million km. HD 202956 b has a very circular orbit. The system is roughly 399 light years from us.
Discovery and nomenclature
File:HD102956b_location.png The name HD 102956 derives directly from the fact that the star is the 102,956th star catalogued in the Henry Draper catalog. The designation of b is given to the first planet orbiting a given star.
The star is one of the 2.5 million brightest stars in the sky and is part of the Tycho-2 Catalogue. It is not visible to the naked eye with an apparent magnitude of 8.
=NameExoWorlds=
In 2019 this planet was announced as part of the IAU NameExoWorlds project{{cite web |url=http://www.nameexoworlds.iau.org/sweden |title=Name an exoplanet (press release) |date=2019-06-06 |access-date=2019-06-13 |archive-date=2019-06-08 |archive-url=https://web.archive.org/web/20190608152931/http://www.nameexoworlds.iau.org/sweden |url-status=dead }} where it was designated as the planet that will be named by Sweden. The winning proposal was Isagel, from Nobel laureate Harry Martinson's space poem Aniara.{{cite web |url=https://fof.se/artikel/rymddikt-gav-namn-sveriges-exoplanet |title=Rymddikt gav namn åt Sveriges exoplanet |date=2019-12-17 |access-date=2021-08-10 |language=Swedish |archive-date=2020-01-12 |archive-url=https://web.archive.org/web/20200112094443/https://fof.se/artikel/rymddikt-gav-namn-sveriges-exoplanet |url-status=dead }}
Host star
HD 102956 (Aniara) is an orange subgiant with a mass and radius of 1.68 {{Solar mass|link=y}} and 4.4 {{Solar radius|link=y}}, respectively. The surface temperature is about {{convert|5054|K|C}}. The star is 11.6 times brighter than the Sun. The star's age is estimated at 2.3 billion years.
References
{{reflist|refs=
{{Cite Gaia DR2|845335158256083584}}
{{cite simbad | title=HD 102956 | access-date=2019-09-21 }}
}}
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Category:Exoplanets discovered in 2010