21 Cancri: Difference between revisions
m →References: task, replaced: VizieR On-Line Data Catalog → VizieR On-line Data Catalog (2), B/gcvs → B/GCVS |
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{{Short description|Red giant star in the constellation Cancer}} |
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{{Starbox begin}} |
{{Starbox begin}} |
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{{Starbox observe |
{{Starbox observe |
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| constell = [[Cancer (constellation)|Cancer]] |
| constell = [[Cancer (constellation)|Cancer]] |
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| epoch = J2000 |
| epoch = J2000 |
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| ra = {{RA|08|23|55. |
| ra = {{RA|08|23|55.20829}}<ref name=dr3/> |
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| dec = {{DEC|+10|37|55. |
| dec = {{DEC|+10|37|55.4169}}<ref name=dr3/> |
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| appmag_v = 6.08<ref name=ducati/> |
| appmag_v = 6.08<ref name=ducati/> |
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}} |
}} |
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{{Starbox character |
{{Starbox character |
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| [[Giant star]] |
| [[Giant star]] |
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| |
| class = M2III<ref name=abt/> |
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| b-v = {{Val|1.507|0.004}}<ref name=Anderson2012/> |
| b-v = {{Val|1.507|0.004}}<ref name=Anderson2012/> |
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| variable = suspected<ref name=gcvs/> |
| variable = suspected<ref name=gcvs/> |
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}} |
}} |
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{{Starbox astrometry |
{{Starbox astrometry |
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| radial_v = |
| radial_v = 4.53<ref name=dr3/> |
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| prop_mo_ra = {{val|-0. |
| prop_mo_ra = {{val|-0.843}}<ref name=dr3/> |
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| prop_mo_dec = {{val|- |
| prop_mo_dec = {{val|-22.943}}<ref name=dr3/> |
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| parallax = 4. |
| parallax = 4.1258 |
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| p_error = 0. |
| p_error = 0.0272 |
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| parallax_footnote = <ref name= |
| parallax_footnote = <ref name=dr3/> |
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| absmag_v = |
| absmag_v = |
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}} |
}} |
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{{Starbox end}} |
{{Starbox end}} |
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'''21 Cancri''' is a [[double star]] in the northern [[zodiac]] [[constellation]] of [[Cancer (constellation)|Cancer]]. It is just visible to the naked eye as a dim, red-hued star with an [[apparent visual magnitude]] of 6.08.<ref name=ducati/> The star is located around |
'''21 Cancri''' is a [[double star]] in the northern [[zodiac]] [[constellation]] of [[Cancer (constellation)|Cancer]]. It is just visible to the naked eye as a dim, red-hued star with an [[apparent visual magnitude]] of 6.08.<ref name=ducati/> The star is located around 791 [[light year]]s away from the Sun, based on [[stellar parallax|parallax]]. It is moving further from the Earth with a heliocentric [[radial velocity]] of 35 km/s.<ref name=dr2/> |
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The brighter component is an aging [[red giant]] with a [[stellar classification]] of M2III.<ref name=abt/> It is currently on the [[asymptotic giant branch]], indicating this is a highly [[stellar evolution|evolved]] star that has exhausted both its core hydrogen and core helium.<ref name=eggen/> This is a suspected [[variable star]].<ref name=gcvs/> It has expanded to 53<ref name=dr2/> times the [[radius of the Sun]] and is radiating |
The brighter component is an aging [[red giant]] with a [[stellar classification]] of M2III.<ref name=abt/> It is currently on the [[asymptotic giant branch]], indicating this is a highly [[stellar evolution|evolved]] star that has exhausted both its core hydrogen and core helium.<ref name=eggen/> This is a suspected [[variable star]].<ref name=gcvs/> It has expanded to 53<ref name=dr2/> times the [[radius of the Sun]] and is radiating 587<ref name=dr2/> times the [[Sun's luminosity]] from its swollen [[photosphere]] at an [[effective temperature]] of 3,885 K.<ref name=dr2/> A 9th magnitude companion star is located one [[arc second]] away.<ref name=eggen/> |
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==References== |
==References== |
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<ref name=dr2>{{cite DR2|600978285351788800}}</ref> |
<ref name=dr2>{{cite DR2|600978285351788800}}</ref> |
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<ref name= |
<ref name=dr3>{{cite Gaia DR3|600978285351788800}}</ref> |
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| title=Validation of the new Hipparcos reduction |
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| last1=van Leeuwen | first1=F. |
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| journal=Astronomy and Astrophysics |
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| volume=474 | issue=2 | pages=653–664 | date=2007 |
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| arxiv=0708.1752 | bibcode=2007A&A...474..653V |
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| doi=10.1051/0004-6361:20078357 }}</ref> |
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<ref name=Anderson2012>{{cite journal |
<ref name=Anderson2012>{{cite journal |
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| volume=38 | issue=5 | pages=331 | year=2012 |
| volume=38 | issue=5 | pages=331 | year=2012 |
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| bibcode=2012AstL...38..331A | arxiv=1108.4971 |
| bibcode=2012AstL...38..331A | arxiv=1108.4971 |
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| doi=10.1134/S1063773712050015 }}</ref> |
| doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref> |
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<ref name=abt>{{cite journal|bibcode=1985ApJS...59...95A|title=Visual multiples. VIII. 1000 MK types|journal=The Astrophysical Journal Supplement Series|volume=59|pages=95|last1=Abt|first1=H. A.|year=1985|doi=10.1086/191064}}</ref> |
<ref name=abt>{{cite journal|bibcode=1985ApJS...59...95A|title=Visual multiples. VIII. 1000 MK types|journal=The Astrophysical Journal Supplement Series|volume=59|pages=95|last1=Abt|first1=H. A.|year=1985|doi=10.1086/191064|doi-access=free}}</ref> |
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<ref name=ducati>{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR On-line Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=VizieR On-line Data Catalog|last1=Ducati|first1=J. R.|year=2002}}</ref> |
<ref name=ducati>{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR On-line Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=VizieR On-line Data Catalog|last1=Ducati|first1=J. R.|year=2002|volume=2237 }}</ref> |
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<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|pages=B/GCVS|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref> |
<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|pages=B/GCVS|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref> |
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{{Stars of Cancer}} |
{{Stars of Cancer}} |
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{{DEFAULTSORT:21 Cancri}} |
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[[Category:M-type giants]] |
[[Category:M-type giants]] |
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[[Category:Suspected variables]] |
[[Category:Suspected variables]] |
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[[Category:Henry Draper Catalogue objects|070734]] |
[[Category:Henry Draper Catalogue objects|070734]] |
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[[Category:Hipparcos objects|041163]] |
[[Category:Hipparcos objects|041163]] |
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[[Category: |
[[Category:Bright Star Catalogue objects|3290]] |
Latest revision as of 17:49, 18 July 2024
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Cancer |
Right ascension | 08h 23m 55.20829s[1] |
Declination | +10° 37′ 55.4169″[1] |
Apparent magnitude (V) | 6.08[2] |
Characteristics | |
Spectral type | M2III[3] |
B−V color index | 1.507±0.004[4] |
Variable type | suspected[5] |
Astrometry | |
Radial velocity (Rv) | 4.53[1] km/s |
Proper motion (μ) | RA: −0.843[1] mas/yr Dec.: −22.943[1] mas/yr |
Parallax (π) | 4.1258 ± 0.0272 mas[1] |
Distance | 791 ± 5 ly (242 ± 2 pc) |
Details | |
Radius | 53[6] R☉ |
Luminosity | 587[6] L☉ |
Temperature | 3,885[6] K |
Other designations | |
Database references | |
SIMBAD | data |
21 Cancri is a double star in the northern zodiac constellation of Cancer. It is just visible to the naked eye as a dim, red-hued star with an apparent visual magnitude of 6.08.[2] The star is located around 791 light years away from the Sun, based on parallax. It is moving further from the Earth with a heliocentric radial velocity of 35 km/s.[6]
The brighter component is an aging red giant with a stellar classification of M2III.[3] It is currently on the asymptotic giant branch, indicating this is a highly evolved star that has exhausted both its core hydrogen and core helium.[7] This is a suspected variable star.[5] It has expanded to 53[6] times the radius of the Sun and is radiating 587[6] times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,885 K.[6] A 9th magnitude companion star is located one arc second away.[7]
References
[edit]- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Ducati, J. R. (2002). "VizieR On-line Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR On-line Data Catalog. 2237. Bibcode:2002yCat.2237....0D.
- ^ a b Abt, H. A. (1985). "Visual multiples. VIII. 1000 MK types". The Astrophysical Journal Supplement Series. 59: 95. Bibcode:1985ApJS...59...95A. doi:10.1086/191064.
- ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/GCVS. Bibcode:2009yCat....102025S.
- ^ a b c d e f g Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.