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Coordinates: Sky map 19h 56m 18s, +35° 05′ 00″
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| equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| constell = [[Cygnus (constellation)|Cygnus]]
| constell = [[Cygnus (constellation)|Cygnus]]
| ra = {{RA|19|56|18.37222}}<ref name=vanLeeuwen2007/>
| ra = {{RA|19|56|18.37184}}<ref name=DR3/>
| dec = {{DEC|+35|05|00.3228}}<ref name=vanLeeuwen2007/>
| dec = {{DEC|+35|05|00.3224}}<ref name=DR3/>
| appmag_v = 3.889<ref name=Oja1986/>
| appmag_v = 3.889<ref name=Oja1986/>
}}
}}
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}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = {{Val|−25.87|0.14}}<ref name=Massarotti2008/>
| radial_v = {{Val|−26.57|0.34}}<ref name=DR3/>
| prop_mo_ra = −33.61<ref name=vanLeeuwen2007/>
| prop_mo_ra = {{val|-34.165}}
| prop_mo_dec = −27.87<ref name=vanLeeuwen2007/>
| prop_mo_dec = {{Val|-28.393}}
⚫
| pm_footnote = <ref name=DR3/>
| parallax = 24.17
| p_error = 0.15
| parallax = 23.5482
| p_error = 0.1078
| parallax_footnote = <ref name=vanLeeuwen2007/>
| parallax_footnote = <ref name=DR3/>
| absmag_v = 0.74<ref name=Cardini2005/>
| absmag_v = 0.74<ref name=Cardini2005/>
}}
}}
{{Starbox detail
{{Starbox detail
| source = <ref name=Massarotti2008/>
| mass = {{val|0.9|0.1}}<ref name=kallinger/>
| mass = 1.59<ref name=Luck2015/>
| radius = {{val|10.2|0.3}}<ref name=kallinger/>
⚫
| luminosity = 60<ref name=kallinger/>
| radius = 11
⚫
| luminosity = 52.5
| temperature = {{Val|4783|20|fmt=commas}}<ref name=Luck2015/>
| temperature = {{Val|4783|20|fmt=commas}}<ref name=Luck2015/>
| gravity = 2.7
| gravity = {{val|2.36|0.08}}<ref name=kallinger/>
| metal_fe = −0.09
| metal_fe = −0.02<ref name=kallinger/>
| rotational_velocity = 2.2
| rotational_velocity = 2.2 <ref name=Massarotti2008/>
⚫
| age_gyr = 3.29<ref name=Luck2015/>
}}
}}
{{Starbox catalog
{{Starbox catalog
| names = {{odlist|B=η Cygni|F=21 Cygni|HD=188947|BD=+34 3798|HIP=98110|HR=7615|IRAS=19544+3456|SAO=69116|TYC=2677-1816-1}}<ref name=SIMBAD/>
| names = [[Bayer designation|η&nbsp;Cyg]], [[Flamsteed designation|21]]&nbsp;Cygni, [[Durchmusterung|BD]]+34°&nbsp;3798, [[Fifth Fundamental Catalogue|FK5]]&nbsp;1521, [[Henry Draper Catalogue|HD]]&nbsp;188947, [[Hipparcos Catalogue|HIP]]&nbsp;98110, [[Harvard Revised catalogue|HR]]&nbsp;7615, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;69116.<ref name=SIMBAD/>
}}
}}
{{Starbox reference
{{Starbox reference
Line 55: Line 54:
}}
}}
{{Starbox end}}
{{Starbox end}}
'''Eta Cygni''' (η Cygni) is a [[star]] in the northern [[constellation]] of [[Cygnus (constellation)|Cygnus]]. It is visible to the naked eye with an [[apparent visual magnitude]] of 3.889.<ref name=Oja1986/> The star lies along the main body of the constellation, about midway between [[Gamma Cygni]] and [[Albireo]].<ref name=MarettCrosby2013/> Based upon an annual [[stellar parallax|parallax shift]] of 24.17&nbsp;[[milliarcsecond|mas]],<ref name=vanLeeuwen2007/> it is located 135&nbsp;[[light year]]s from the [[Sun]].
'''Eta Cygni''' (η Cygni) is a [[star]] in the northern [[constellation]] of [[Cygnus (constellation)|Cygnus]]. It is visible to the naked eye with an [[apparent visual magnitude]] of 3.889.<ref name=Oja1986/> The star lies along the main body of the constellation, about midway between [[Gamma Cygni]] and [[Albireo]].<ref name=MarettCrosby2013/> Based upon an annual [[stellar parallax|parallax shift]] of 23.55&nbsp;[[milliarcsecond|mas]],<ref name=DR3/> it is located 138.5&nbsp;[[light year]]s from the [[Sun]].


At an age of about 3.3<ref name=Luck2015/> billion years, this is an [[stellar evolution|evolved]] [[red clump]]<ref name=Puzeras2010/> [[giant star]] with a [[stellar classification]] of K0&nbsp;III.<ref name=Morgan1973/> It is presently on the [[horizontal branch]] and is generating energy through the nuclear fusion of helium at its core. The star has about 1.59<ref name=Luck2015/> times the [[solar mass|mass of the Sun]] and has expanded to 11<ref name=Massarotti2008/> It radiates 52.5 times the [[solar luminosity]] from its [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 4,783&nbsp;K.<ref name=Luck2015/>
This is an [[stellar evolution|evolved]] [[red clump]]<ref name=Puzeras2010/> [[giant star]] with a [[stellar classification]] of K0&nbsp;III.<ref name=Morgan1973/> It is presently on the [[horizontal branch]] and is generating energy through the nuclear fusion of helium at its core. The star has about 0.9 times the [[solar mass|mass of the Sun]] and has expanded to 10 It radiates 60 times the [[solar luminosity]] from its [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 4,780&nbsp;K.<ref name=kallinger/>


Eta Cygni has five visual companions,<ref name=WDSC2014/> of which only component B appears to be physically associated. This magnitude 12.0 star lies at an [[angular separation]] of 7.80&nbsp;[[arc second]]s along a [[position angle]] of 206°, as of 2007.<ref name=Eggleton2008/>
Eta Cygni has five visual companions,<ref name=WDSC2014/> of which only component B appears to be physically associated. This magnitude 12.0 star lies at an [[angular separation]] of 7.80&nbsp;[[arc second]]s along a [[position angle]] of 206°, as of 2007.<ref name=Eggleton2008/>
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{{reflist|refs=
{{reflist|refs=


<ref name=vanLeeuwen2007>{{citation
<!-- <ref name=vanLeeuwen2007>{{citation
| title=Validation of the new Hipparcos reduction
| title=Validation of the new Hipparcos reduction
| last1=van Leeuwen | first1=F.
| last1=van Leeuwen | first1=F.
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| volume=474 | issue=2 | pages=653–664 | date=2007
| volume=474 | issue=2 | pages=653–664 | date=2007
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}</ref>
| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}</ref> -->


<ref name=Cardini2005>{{citation
<ref name=Cardini2005>{{citation
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| journal=[[Monthly Notices of the Royal Astronomical Society]]
| journal=[[Monthly Notices of the Royal Astronomical Society]]
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E
| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref>
| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref>

<ref name=DR3>{{Cite DR3|2059372363884259072}}</ref>


<ref name=WDSC2014>{{citation
<ref name=WDSC2014>{{citation
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| title=High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements | journal=Monthly Notices of the Royal Astronomical Society
| title=High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements | journal=Monthly Notices of the Royal Astronomical Society
| volume=408 | issue=2 | pages=1225–1232 | date=October 2010
| volume=408 | issue=2 | pages=1225–1232 | date=October 2010
| doi=10.1111/j.1365-2966.2010.17195.x | postscript=.
| doi=10.1111/j.1365-2966.2010.17195.x | doi-access=free | postscript=.
| bibcode=2010MNRAS.408.1225P | arxiv=1006.3857 | s2cid=44228180 }}</ref>
| bibcode=2010MNRAS.408.1225P | arxiv=1006.3857 | s2cid=44228180 }}</ref>

<ref name=kallinger>{{Citation |last1=Kallinger |first1=T. |last2=Beck |first2=P. G. |last3=Hekker |first3=S. |last4=Huber |first4=D. |last5=Kuschnig |first5=R. |last6=Rockenbauer |first6=M. |last7=Winter |first7=P. M. |last8=Weiss |first8=W. W. |last9=Handler |first9=G. |last10=Moffat |first10=A. F. J. |last11=Pigulski |first11=A. |last12=Popowicz |first12=A. |last13=Wade |first13=G. A. |last14=Zwintz |first14=K. |date=2019-04-01 |title=Stellar masses from granulation and oscillations of 23 bright red giants observed by BRITE-Constellation |bibcode=2019A&A...624A..35K |arxiv=1902.07531 |journal=Astronomy & Astrophysics |language=en |volume=624 |pages=A35 |doi=10.1051/0004-6361/201834514 |issn=0004-6361 }}</ref>


<ref name=Luck2015>{{citation
<ref name=Luck2015>{{citation
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{{Stars of Cygnus|state=collapsed}}
{{Stars of Cygnus|state=collapsed}}
{{Sky|19|56|18|+|35|05|00}}

[[Category:K-type giants]]
[[Category:K-type giants]]
[[Category:Horizontal-branch stars]]
[[Category:Horizontal-branch stars]]

Latest revision as of 00:10, 23 August 2024

η Cygni
Location of η Cygni (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cygnus
Right ascension 19h 56m 18.37184s[1]
Declination +35° 05′ 00.3224″[1]
Apparent magnitude (V) 3.889[2]
Characteristics
Spectral type K0 III[3]
U−B color index +0.881[2]
B−V color index +1.035[2]
Astrometry
Radial velocity (Rv)−26.57±0.34[1] km/s
Proper motion (μ) RA: −34.165 mas/yr[1]
Dec.: −28.393 mas/yr[1]
Parallax (π)23.5482 ± 0.1078 mas[1]
Distance138.5 ± 0.6 ly
(42.5 ± 0.2 pc)
Absolute magnitude (MV)0.74[4]
Details
Mass0.9±0.1[5] M☉
Radius10.2±0.3[5] R☉
Luminosity60[5] L☉
Surface gravity (log g)2.36±0.08[5] cgs
Temperature4,783±20[6] K
Metallicity [Fe/H]−0.02[5] dex
Rotational velocity (v sin i)2.2 [7] km/s
Other designations
η Cygni, 21 Cygni, BD+34 3798, HD 188947, HIP 98110, HR 7615, SAO 69116, TYC 2677-1816-1, IRAS 19544+3456[8]
Database references
SIMBADdata

Eta Cygni (η Cygni) is a star in the northern constellation of Cygnus. It is visible to the naked eye with an apparent visual magnitude of 3.889.[2] The star lies along the main body of the constellation, about midway between Gamma Cygni and Albireo.[9] Based upon an annual parallax shift of 23.55 mas,[1] it is located 138.5 light years from the Sun.

This is an evolved red clump[10] giant star with a stellar classification of K0 III.[3] It is presently on the horizontal branch and is generating energy through the nuclear fusion of helium at its core. The star has about 0.9 times the mass of the Sun and has expanded to 10 It radiates 60 times the solar luminosity from its outer atmosphere at an effective temperature of 4,780 K.[5]

Eta Cygni has five visual companions,[11] of which only component B appears to be physically associated. This magnitude 12.0 star lies at an angular separation of 7.80 arc seconds along a position angle of 206°, as of 2007.[12]

References

[edit]
  1. ^ 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.
  2. ^ a b c d Oja, T. (August 1986), "UBV photometry of stars whose positions are accurately known. III", Astronomy and Astrophysics Supplement Series, 65 (2): 405–409, Bibcode:1986A&AS...65..405O.
  3. ^ a b Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29–50, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333.
  4. ^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv:astro-ph/0409683, Bibcode:2005A&A...430..303C, doi:10.1051/0004-6361:20041440, S2CID 12136256.
  5. ^ a b c d e f Kallinger, T.; Beck, P. G.; Hekker, S.; Huber, D.; Kuschnig, R.; Rockenbauer, M.; Winter, P. M.; Weiss, W. W.; Handler, G.; Moffat, A. F. J.; Pigulski, A.; Popowicz, A.; Wade, G. A.; Zwintz, K. (2019-04-01), "Stellar masses from granulation and oscillations of 23 bright red giants observed by BRITE-Constellation", Astronomy & Astrophysics, 624: A35, arXiv:1902.07531, Bibcode:2019A&A...624A..35K, doi:10.1051/0004-6361/201834514, ISSN 0004-6361
  6. ^ Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114, 88.
  7. ^ Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
  8. ^ "eta Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-02-19.
  9. ^ Marett-Crosby, Michael (2013), Twenty-Five Astronomical Observations That Changed the World: And How To Make Them Yourself, The Patrick Moore Practical Astronomy Series, Springer Science & Business Media, p. 231, ISBN 978-1461468004.
  10. ^ Puzeras, E.; et al. (October 2010), "High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements", Monthly Notices of the Royal Astronomical Society, 408 (2): 1225–1232, arXiv:1006.3857, Bibcode:2010MNRAS.408.1225P, doi:10.1111/j.1365-2966.2010.17195.x, S2CID 44228180.
  11. ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
  12. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
[edit]
  • Kaler, James B. (September 7, 2012), "Eta Cygni", Stars, University of Illinois, retrieved 2017-02-19.
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