Pr0211
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| constell = Cancer
| dec = {{DEC|+19|16|37.2375}}
}}
{{Starbox character
| type = Main sequence
| class = K1V or late G
| appmag_1_passband = G
| appmag_1 = {{val|11.926|0.003}}
| appmag_2_passband = J
| appmag_2 = {{val|10.660|0.022}}
| appmag_3_passband = H
| appmag_3 = {{val|10.242|0.019}}
| appmag_4_passband = K
| appmag_4 = {{val|10.173|0.016}}
}}
{{Starbox astrometry
| radial_v = {{val|35.37|0.42}}
| prop_mo_ra = -36.820
| prop_mo_dec = -12.384
| parallax = 5.4387
| p_error = 0.0184
| absmag_v =
| absmag_bol =
}}
{{Starbox detail
| mass = {{val|0.935|0.013}}
| radius = {{val|0.827|0.012}}
| luminosity_bolometric =
| gravity = {{val|4.51|0.05}}
| temperature = {{val|5300|30}}
| metal_fe = {{val|0.18|0.02}}
| rotational_velocity = {{val|5.1|0.3}}
| age_myr = {{val|578|12}} or {{val|790|30}}
}}
{{Starbox catalog
| names = Pr0211, {{odlist | 2MASS = J08421149+1916373 | EPIC = 211936827 | NGC = 2632 JC 278 | TIC = 175291727}}
}}
{{Starbox reference
| Simbad = Cl*+NGC+2632+JC+278
| NSTED = Pr0211
}}
{{Starbox end}}
Pr0211 (sometimes written Pr 0211, also 2MASS J08421149+1916373) is a Sun-like late G or early K-type main-sequence star in the Beehive Cluster, or Praesepe, located 600 light-years away in the constellation Cancer. It is rotationally variable and has a rotation period of 7.97 days, with its spin axis at an inclination of {{val|76|11|u=deg}} to the plane of the sky. Pr0211 hosts two known exoplanets, and was the first multi-planet system to be discovered in an open cluster.
Pr0211 forms a binary star system with a K-type main-sequence star known as NGC 2632 JC 280 or 2MASS J08421285+1916040.
Planetary system
Pr0211 b is a gas giant exoplanet, specifically a hot Jupiter, orbiting around Pr0211. Pr0211 b along with Pr0201 b are notable for being the first exoplanets discovered in the Beehive Cluster. Pr0211 b and Pr0201 b were discovered in 2012 by Sam Quinn and his colleagues while observing 53 stars in the Beehive Cluster using the {{convert|1.5|m|ft yd|lk=on}} telescope at the University of Georgia in the United States.
Pr0211 c is a gas giant exoplanet orbiting around Pr0211. Pr0211 c was discovered in 2016 by Luca Malavolta and his colleagues while observing its host star with the HARPS-N spectrograph on the {{convert|3.6|m|ft yd|lk=on}} Italian Telescopio Nazionale Galileo (TNG) in La Palma, and the Tillinghast Reflector Echelle Spectrograph (TRES) mounted at the {{convert|1.5|m|ft yd|lk=on}} telescope at the University of Georgia in the United States.
{{Orbitbox planet begin
}}
{{Orbitbox planet
| exoplanet = b
| mass = {{val|1.88|0.03|p=≥}}
| radius =
| semimajor = {{val|0.03176|0.00015}}
| period = {{val|2.14610|0.00003}}
| eccentricity = {{val|0.011|0.012|0.008}}
| inclination =
}}
{{Orbitbox planet
| exoplanet = c
| mass = {{val|7.79|0.33|p=≥}}
| radius =
| semimajor = {{val|5.5|3.0|1.4}}
| period = {{val|4850|4560|1750}}
| eccentricity = {{val|0.71|0.11}}
| inclination =
}}
{{Orbitbox end}}
References
{{Reflist|refs=
{{cite simbad |title=Cl* NGC 2632 JC 278 |access-date=9 December 2023}}
{{cite simbad |title=Cl* NGC 2632 JC 280 |access-date=9 December 2023}}
{{Cite Gaia DR3|661222279785743616}}
{{cite web
| url =http://news.nationalgeographic.com/news/2012/120920-new-planets-star-cluster-science-space-beehive-exoplanets/
| archive-url =https://web.archive.org/web/20120923004304/http://news.nationalgeographic.com/news/2012/120920-new-planets-star-cluster-science-space-beehive-exoplanets/
| url-status =dead
| archive-date =September 23, 2012
| title =New Planets Found in Star Cluster - Would Have Dazzling Nights
| last =Fazekas
| first =Andrew
| date =2012-09-21
| website =National Geographic News
| publisher =NATIONAL GEOGRAPHIC
| access-date =2016-05-30
}}
{{cite encyclopedia
| url=https://exoplanet.eu/catalog/pr_0211_b--2604/
| encyclopedia=Extrasolar Planets Encyclopaedia
| title=Planet Pr 0211 b
| access-date=2016-04-18
}}
{{cite encyclopedia
| url=https://exoplanet.eu/catalog/pr_0211_c--2605/
| encyclopedia=Extrasolar Planets Encyclopaedia
| title=Planet Pr 0211 c
| access-date=2016-04-18
}}
{{cite web |url=https://exoplanetarchive.ipac.caltech.edu/overview/Pr0211 |title=Pr0211 |website=NASA Exoplanet Archive |access-date=9 December 2023}}
{{cite journal |last1=Mugrauer |first1=M. |date=December 2019 |title=Search for stellar companions of exoplanet host stars by exploring the second ESA-Gaia data release |journal=Monthly Notices of the Royal Astronomical Society |volume=490 |issue=4 |pages=5088–5102 |doi=10.1093/mnras/stz2673 |bibcode=2019MNRAS.490.5088M|doi-access=free }}
}}
{{Pr 0211}}
{{2016 in space}}
{{Cancer (constellation)}}
Category:Cancer (constellation)
Category:K-type main-sequence stars