m Here I corrected the date on the 'unreferenced' banner at the top
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Revert to revision 1106185919 dated 2022-08-23 15:07:17 by Lithopsian using popups
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{{Short description|Star in the constellation Cancer}} |
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{{Unreferenced|date=June 2013}} |
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{{Starbox |
{{Starbox begin}} |
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{{Starbox observe |
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|constell= [[Cancer (constellation)|Cancer]] |
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|epoch = J2000 |
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|ra= {{RA|08|03|50.47881}}<ref name=dr3/> |
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|dec= {{DEC|+22|04|14.8926}}<ref name=dr3/> |
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|appmag_v = 6.84<ref name=eggen/> |
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}} |
}} |
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{{Starbox character |
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⚫ | '''7 Cancri''' is a [[star]] in the [[constellation]] [[Cancer (constellation)|Cancer]]. |
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|type = [[red giant branch]]<ref name=dr3/> |
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|class = gK3<ref name=eggen/> |
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}} |
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{{Starbox astrometry |
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|radial_v = 1.90<ref name=dr3/> |
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|prop_mo_ra = {{val|-40.866}}<ref name=dr3/> |
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|prop_mo_dec = {{val|-5.129}}<ref name=dr3/> |
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|parallax = 5.8616 |
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|p_error = 0.0215 |
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|parallax_footnote = <ref name=dr3/> |
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|absmag_v = +0.32<ref name=xhip/> |
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}} |
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{{Starbox detail |
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|mass = 3.2<ref name=dr3/> |
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|temperature = 4,711<ref name=dr3/> |
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|luminosity = 75<ref name=dr3/> |
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|radius = 13<ref name=dr3/> |
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|gravity = 2.5<ref name=dr3/> |
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|metal_fe = +0.02 |
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|rotational_velocity = |
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|age_myr = 318 |
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}} |
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{{Starbox catalog |
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|names={{odlist|B=|BD=+22°1845|FK5=|HD=66347|HIP=39447|HR=|SAO=79903}} |
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}} |
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{{Starbox reference |
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}} |
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{{Starbox end}} |
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⚫ | '''7 Cancri''' ('''7 Cnc''') is a [[giant star]] in the [[constellation]] [[Cancer (constellation)|Cancer]]. Its [[apparent magnitude]] is 6.84 and it is about {{val|556|ul=ly}} away. |
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The annual parallax of 7 Cancri determined from the [[Hipparcos]] satellite mission is {{val|488|0.56|ul=mas}}, giving a distance of {{val|202|ul=pc}} with an 11.5% margin of error.<ref name=xhip/> The more recent and more accurate [[Gaia Data Release 3]] contains a parallax of {{val|5.8616|0.0215|u=mas}}, resulting in a closer distance of {{val|171|1|u=pc}}. Based on the [[Gaia (spacecraft)|Gaia]] distance, 7 Cancri has a [[bolometric luminosity]] 75 times that of the sun. Its temperature, based on its colour, is calculated to be {{val|4,711|fmt=commas|ul=K}} and the resulting radius is {{solar radius|13|link=y}}.<ref name=dr3/> |
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7 Cancri is a cool giant star. It has evolved away from the [[main sequence]] after exhausting its core hydrogen and expanded so that it is larger and more luminous than the sun, although cooler. It is one of 220 [[Flamsteed designation|Flamsteed stars]] that are too faint to have been included in the [[Bright Star Catalogue]].<ref name=bidelman/> |
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==References== |
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{{Main-star-stub}} |
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{{reflist|refs= |
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<ref name=bidelman>{{cite journal|bibcode=1990BICDS..38...13B|title=Flamsteed stars not contained in the Yale "Catalogue of Bright Stars"|journal=Bulletin d'Information du Centre de Données Stellaires|volume=38|pages=13|last1=Bidelman|first1=W. P.|year=1990}}</ref> |
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<ref name=eggen>{{cite journal|bibcode=1986PASP...98..423E|title=Hyades and Sirius supercluster members brighter than magnitude (V) 7.1. II - Right ascension six to twelve hours|journal=Astronomical Society of the Pacific|volume=98|pages=423|last1=Eggen|first1=O. J.|year=1986|doi=10.1086/131772|doi-access=free}}</ref> |
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<ref name=dr3>{{cite Gaia DR3|680043788548399360}}</ref> |
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<ref name=xhip>{{cite journal | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | title=XHIP: An extended hipparcos compilation | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | s2cid=119257644 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=V/137D/XHIP&HIP=39447 Vizier catalog entry]</ref> |
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}} |
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{{DEFAULTSORT:7 Cancri}} |
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[[Category:Henry Draper Catalogue objects|066347]] |
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[[Category:Hipparcos objects|039447]] |
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[[Category:Durchmusterung objects]] |
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Cancer |
Right ascension | 08h03m 50.47881s[1] |
Declination | +22° 04′ 14.8926″[1] |
Apparent magnitude (V) | 6.84[2] |
Characteristics | |
Evolutionary stage | red giant branch[1] |
Spectral type | gK3[2] |
Astrometry | |
Radial velocity (Rv) | 1.90[1] km/s |
Proper motion (μ) | RA: −40.866[1] mas/yr Dec.: −5.129[1] mas/yr |
Parallax (π) | 5.8616 ± 0.0215 mas[1] |
Distance | 556 ± 2 ly (170.6 ± 0.6 pc) |
Absolute magnitude (MV) | +0.32[3] |
Details | |
Mass | 3.2[1] M☉ |
Radius | 13[1] R☉ |
Luminosity | 75[1] L☉ |
Surface gravity (log g) | 2.5[1] cgs |
Temperature | 4,711[1] K |
Metallicity [Fe/H] | +0.02 dex |
Age | 318 Myr |
Other designations | |
Database references | |
SIMBAD | data |
7 Cancri (7 Cnc) is a giant star in the constellation Cancer. Its apparent magnitude is 6.84 and it is about 556 ly away.
The annual parallax of 7 Cancri determined from the Hipparcos satellite mission is 488±0.56 mas, giving a distance of 202 pc with an 11.5% margin of error.[3] The more recent and more accurate Gaia Data Release 3 contains a parallax of 5.8616±0.0215 mas, resulting in a closer distance of 171±1 pc. Based on the Gaia distance, 7 Cancri has a bolometric luminosity 75 times that of the sun. Its temperature, based on its colour, is calculated to be 4,711 K and the resulting radius is 13 R☉.[1]
7 Cancri is a cool giant star. It has evolved away from the main sequence after exhausting its core hydrogen and expanded so that it is larger and more luminous than the sun, although cooler. It is one of 220 Flamsteed stars that are too faint to have been included in the Bright Star Catalogue.[4]
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