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|epoch=J2000
|epoch=J2000
|constell= [[Hydra (constellation)|Hydra]]
|constell= [[Hydra (constellation)|Hydra]]
|ra= {{RA|09|54|52.20987}}<ref name=SIMBAD/>
|ra= {{RA|09|54|52.21}}<ref name = GaiaDR2/>
|dec= {{DEC|-19|00|33.6949}}<ref name=SIMBAD/>
|dec= {{DEC|-19|00|33.61}}<ref name = GaiaDR2/>
|appmag_v= 4.94<ref name=SIMBAD/>
|appmag_v= 4.94<ref name = Ducati2002/>
}}
}}
{{Starbox character
{{Starbox character
|type= K5 III<ref name=SIMBAD>{{cite simbad|title=HD 85951|access-date=30 September 2012}}</ref>
| class= K5 III<ref name = Houk1988/>
| b-v = +1.57<ref name = Ducati2002/>
| u-b = +1.93<ref name = Ducati2002/>
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = 50.00 ± 4.2<ref name=SIMBAD/>
| radial_v = {{val|50|4}}<ref name = Gontch20006/>
| prop_mo_ra = &minus;47.445<ref name=SIMBAD/>
| prop_mo_ra = {{val|-47.445|0.380}}<ref name = GaiaDR2/>
| prop_mo_dec = &minus;41.155<ref name=SIMBAD/>
| prop_mo_dec = {{val|-41.155|0.404}}<ref name = GaiaDR2/>
| parallax = 6.2052
| parallax = 6.2052
| p_error = 0.2415
| p_error = 0.2415
| parallax_footnote = <ref name=SIMBAD/>
| parallax_footnote = <ref name = GaiaDR2/>
|absmag_v = -1.43<ref name = XHIP/>
}}
{{Starbox detail
| mass = 1.12<ref name = Anders2019/>
| radius = {{val|56.77|2.97|4.15}}<ref name = GaiaDR2/>
| luminosity = {{val|721|32}}<ref name = GaiaDR2/>
| temperature = {{val|3970|123|100|fmt=commas}}<ref name = GaiaDR2/>
| gravity = 0.89<ref name = Anders2019/>
| metal_fe = +0.02<ref name = Anders2019/>
}}
}}
{{Starbox catalog
{{Starbox catalog
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}}
}}
{{Starbox end}}
{{Starbox end}}
'''HD 85951''', also designated '''HR 3923''' and formally named '''Felis''' {{IPAc-en|'|f|iː|l|I|s}},<ref name="IAU-LSN">{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |access-date=18 June 2018}}</ref> is a [[star]] in the [[constellation]] of [[Hydra (constellation)|Hydra]]. Its [[apparent magnitude]] is 4.95. Based on [[stellar parallax|parallax]] measurements it is about 530 [[light-year]]s (162 [[parsec]]s) from the [[Sun]].
'''HD 85951 (HR 3923)''',formally named '''Felis''' {{IPAc-en|'|f|iː|l|I|s}},<ref name="IAU-LSN"/> is a [[star]] in the [[constellation]] [[Hydra (constellation)|Hydra]]. With an [[apparent magnitude]] of 4.95, it's faintly visible under ideal conditions. Based on [[stellar parallax|parallax]] measurements it is about 530 [[light-year]]s (162 [[parsec]]s) from the [[Sun]], but is drifting away with a heliocentric [[Radial velocity|radial velocity]] of 50 km/s


== Nomenclature ==
== Nomenclature ==
⚫
HD 85951 was the brightest star in the now-obsolete [[constellation]] of [[Felis (constellation)|Felis]].<ref name="Star Tales"/> In 2016, the IAU organized a [[IAU Working Group on Star Names|Working Group on Star Names]] (WGSN)<ref name="WGSN"/> to catalog and standardize proper names for stars. The WGSN approved the name ''Felis'' for this star on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/>


⚫
== Properties ==
HD 85951 is the star's entry in the [[Henry Draper Catalogue]] and HR 3923 that in the [[Bright Star Catalogue]].
This star is a [[K-type star|K-type]] [[orange giant]] with a [[stellar classification]] of K5 III, which states that it has exhausted [[Hydrogen|hydrogen]] at it's core and left the [[Main sequence|main sequence]]. HD 85951 has a similar mass to our [[Sun]], but has expanded to 57 times the [[Sun's radius]]. It radiates at a luminosity 721 times greater from it's enlarged [[photosphere]] at an effective temperature of 3,970 Kelvin, which gives it a typical orange-yellow hue of a K-type star.


⚫
==References==
⚫
This was the brightest star in the now-obsolete [[constellation]] of [[Felis (constellation)|Felis]].<ref name="Star Tales">{{cite web | url=http://www.ianridpath.com/startales/felis.html | title=''Star Tales'' Felis|access-date=16 January 2021}}</ref> In 2016, the IAU organized a [[IAU Working Group on Star Names|Working Group on Star Names]] (WGSN)<ref name="WGSN">{{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|access-date=22 May 2016}}</ref> to catalog and standardize proper names for stars. The WGSN approved the name ''Felis'' for this star on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/>
⚫
{{reflist|30em|refs=


<ref name = GaiaDR2>{{Cite DR2|5671793318423471616}}</ref>
⚫
== Properties ==


<ref name = Ducati2002>{{cite journal |last1=Ducati |first1=J. R. |title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system. |journal=VizieR Online Data Catalog |date=1 January 2002 |url=https://ui.adsabs.harvard.edu/abs/2002yCat.2237....0D/abstract}}</ref>
This star is a [[K-type star|K-type]] [[orange giant]] with a [[stellar classification]] of K5&nbsp;III.<ref name=SIMBAD/>


<ref name=SIMBAD>{{cite simbad|title=HD 85951|access-date=30 September 2012}}</ref>
⚫
==References==

⚫
{{reflist}}
<ref name = Houk1988>{{cite journal |last1=Houk |first1=N. |last2=Smith-Moore |first2=M. |title=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0. |date=1 January 1988 |volume=4 |url=https://ui.adsabs.harvard.edu/abs/1988mcts.book.....H/abstract}}</ref>

<ref name = Gontch20006>{{cite journal |last1=Gontcharov |first1=G. A. |title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system |journal=Astronomy Letters |date=1 November 2006 |volume=32 |pages=759–771 |doi=10.1134/S1063773706110065 |url=https://ui.adsabs.harvard.edu/abs/2006AstL...32..759G/abstract |issn=1063-7737}}</ref>

<ref name = XHIP>{{cite journal |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |title=XHIP: An extended hipparcos compilation |journal=Astronomy Letters |date=1 May 2012 |volume=38 |pages=331–346 |doi=10.1134/S1063773712050015 |url=https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A/abstract |issn=1063-7737}}</ref>

<ref name="Star Tales">{{cite web | url=http://www.ianridpath.com/startales/felis.html | title=''Star Tales'' Felis|access-date=16 January 2021}}</ref>

<ref name="WGSN">{{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|access-date=22 May 2016}}</ref>

<ref name="IAU-LSN">{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |access-date=18 June 2018}}</ref>

<ref name = Anders2019>{{cite journal |display-authors=1 |last1=Anders |first1=F. |last2=Khalatyan |first2=A. |last3=Chiappini |first3=C. |last4=Queiroz |first4=A. B. |last5=Santiago |first5=B. X. |last6=Jordi |first6=C. |last7=Girardi |first7=L. |last8=Brown |first8=A. G. A. |last9=Matijevič |first9=G. |last10=Monari |first10=G. |last11=Cantat-Gaudin |first11=T. |last12=Weiler |first12=M. |last13=Khan |first13=S. |last14=Miglio |first14=A. |last15=Carrillo |first15=I. |last16=Romero-Gómez |first16=M. |last17=Minchev |first17=I. |last18=de Jong |first18=R. S. |last19=Antoja |first19=T. |last20=Ramos |first20=P. |last21=Steinmetz |first21=M. |last22=Enke |first22=H. |title=Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18 |journal=Astronomy and Astrophysics |date=1 August 2019 |volume=628 |pages=A94 |doi=10.1051/0004-6361/201935765 |url=https://ui.adsabs.harvard.edu/abs/2019A&A...628A..94A/abstract |issn=0004-6361}}</ref>

}}


{{Stars of Hydra}}
{{Stars of Hydra}}
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[[Category:Hipparcos objects|048615]]
[[Category:Hipparcos objects|048615]]
[[Category:HR objects|3923]]
[[Category:HR objects|3923]]


{{giant-star-stub}}

Revision as of 22:05, 9 October 2021

HD 85951
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 09h 54m 52.21s[1]
Declination −19° 00′ 33.61″[1]
Apparent magnitude (V) 4.94[2]
Characteristics
Spectral type K5 III[3]
U−B color index +1.93[2]
B−V color index +1.57[2]
Astrometry
Radial velocity (Rv)50±4[4] km/s
Proper motion (μ) RA: −47.445±0.380[1] mas/yr
Dec.: −41.155±0.404[1] mas/yr
Parallax (π)6.2052 ± 0.2415 mas[1]
Distance530 ± 20 ly
(161 ± 6 pc)
Absolute magnitude (MV)-1.43[5]
Details
Mass1.12[6] M☉
Radius56.77+2.97
−4.15[1] R☉
Luminosity721±32[1] L☉
Surface gravity (log g)0.89[6] cgs
Temperature3,970+123
−100[1] K
Metallicity [Fe/H]+0.02[6] dex
Other designations
Felis, BD−18° 2810, FK5 373, HIP 48615, HR 3923, SAO 155588[7]
Database references
SIMBADdata

HD 85951 (HR 3923),formally named Felis /ˈfiːlɪs/,[8] is a star in the constellation Hydra. With an apparent magnitude of 4.95, it's faintly visible under ideal conditions. Based on parallax measurements it is about 530 light-years (162 parsecs) from the Sun, but is drifting away with a heliocentric radial velocity of 50 km/s

Nomenclature

HD 85951 was the brightest star in the now-obsolete constellation of Felis.[9] In 2016, the IAU organized a Working Group on Star Names (WGSN)[10] to catalog and standardize proper names for stars. The WGSN approved the name Felis for this star on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.[8]

Properties

This star is a K-type orange giant with a stellar classification of K5 III, which states that it has exhausted hydrogen at it's core and left the main sequence. HD 85951 has a similar mass to our Sun, but has expanded to 57 times the Sun's radius. It radiates at a luminosity 721 times greater from it's enlarged photosphere at an effective temperature of 3,970 Kelvin, which gives it a typical orange-yellow hue of a K-type star.

References

  1. ^ a b c d e f g h 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.
  2. ^ a b c Ducati, J. R. (1 January 2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR Online Data Catalog.
  3. ^ Houk, N.; Smith-Moore, M. (1 January 1988). "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0". 4. {{cite journal}}: Cite journal requires |journal= (help)
  4. ^ Gontcharov, G. A. (1 November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32: 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737.
  5. ^ Anderson, E.; Francis, Ch. (1 May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38: 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737.
  6. ^ a b c Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
  7. ^ "HD 85951". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 September 2012.
  8. ^ a b "Naming Stars". IAU.org. Retrieved 18 June 2018.
  9. ^ "Star Tales Felis". Retrieved 16 January 2021.
  10. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
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