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{{Starbox begin
#REDIRECT [[List of multiplanetary systems]]
| name = [[Henry Draper Catalogue|HD]] 39194
}}
{{Starbox observe
| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| constell = [[Mensa (constellation)|Mensa]]
| ra = {{RA|05|44|31.9180}}<ref name = EDR3/>
| dec = {{DEC|-70|08|36.8578}}<ref name = EDR3/>
| appmag_v = 8.07{{±|0.01}}<ref name = Tycho2000/>
}}
{{Starbox character
| class = K0 V<ref name = Gray2006/>
| u-b = +0.26<ref name = Eggen1979/><ref name= SandageFouts1987/>
| b-v = +0.76<ref name = Eggen1979/><ref name= SandageFouts1987/>
}}
{{Starbox astrometry
| radial_v = 13.90{{±|0.10}}<ref name = Gontcharov2006/>
| parallax = 37.8235
| p_error = 0.0206
| parallax_footnote = <ref name = EDR3/>
| prop_mo_ra = −309.273
| prop_mo_dec = +1238.862
| pm_footnote = <ref name = EDR3/>
| absmag_v = +6.02<ref name=Anderson2012/>
}}
{{Starbox detail
| mass = 0.71<ref name = Luck2018/>
| radius = 0.74<ref name = Turnbull2015/>
| luminosity = 0.389<ref name = Unger2021/>
| gravity = 4.61{{±|0.05}}<ref name = Sousa2008/>
| temperature = 5,205{{±|23}}<ref name = Sousa2008/>
| metal_fe = −0.61{{±|0.02}}<ref name = Sousa2008/>
| rotational_velocity = 2<ref name = Nordstrom2004/>
| age_gyr = 11.7<ref name = Luck2018/>
}}
{{Starbox catalog
| names = {{odlist|LHS = 210|CD = −70°340|CPD = −70°447|GJ = 217.2|HIP = 27080|SAO = 256232|HD = 39194}}
}}
{{Starbox reference
| Simbad = HD+39194
}}
{{Starbox end}}

'''HD 39194''' ('''Gliese 217.2; LHS 210''') is a [[star]] located in the southern [[circumpolar constellation]] [[Mensa (constellation)|Mensa]]. It has an [[apparent magnitude]] of 8.07,<ref name = Tycho2000/> making it readily visible in binoculars but not to the [[naked eye]]. The object is relatively close at a distance of 86 [[light year]]s<ref name = EDR3/> but is receding with a heliocentric [[radial velocity]] of {{val|13.9|ul=km/s}}.<ref name = Gontcharov2006/>

HD 39194 has a general [[stellar classification]] of K0 V,<ref name = Gray2006/> indicating that it is a [[K-type main-sequence star]]. Houk & Cowley found a slightly warmer class of G8 V,<ref name = Houk1975/> instead making it a [[G-type main-sequence star]]. Nevertheless, it has 71% the [[mass of the Sun]]<ref name = Luck2018/> and an [[effective temperature]] of {{val|5205|ul=K|fmt=commas}},<ref name = Sousa2008/> giving an orange hue. It radius of {{val|0.74|ul=solar radius}}<ref name = Turnbull2015/> yields a [[luminosity]] only 38% that of the [[Sun]].<ref name = Unger2021/> HD 39194 is estimated to be 11.7 [[billion years]] old<ref name = Luck2018/> and is extremely [[Stellar magnetic field|chromospherically inactive]].<ref name = Gray2006/> Despite being a planetary host, it has an [[iron]] abundance only 24% that of the Sun.<ref name = Sousa2008/> HD 39194's [[projected rotational velocity]] is similar to the Sun's, with the value being {{val|2|ul=km/s}}.<ref name = Nordstrom2004/>

==Planetary System==
This star was selected as a potential candidate for [[exoplanet]]s beginning in 2015.<ref name = Turnbull2015/> After 7 years of observations, a team of [[astronomers]] discovered 3 [[super-Earth]]s circling HD 39194 in [[orbital eccentricity|eccentric]] orbits;<ref name = Unger2021/> none of the planets are in the [[habitable zone]]. It should be noted that HD 39194 b and d have similar masses.

{{OrbitboxPlanet begin
| table_ref = <ref name = Unger2021/>
}}
{{OrbitboxPlanet
| exoplanet = b
| mass_earth = ≥4.13{{±|0.20}}
| period = 5.6368{{±|0.0004}}
| semimajor = 0.056{{±|0.001}}
| eccentricity = <0.207
}}
{{OrbitboxPlanet
| exoplanet = c
| mass_earth = ≥6.29{{±|0.51}}
| period = 14.030{{±|0.003}}
| semimajor = 0.103{{±|0.002}}
| eccentricity = <0.154
}}
{{OrbitboxPlanet
| exoplanet = d
| mass_earth = ≥4.13{{±|0.60}}
| period = 33.91{{±|0.03}}
| semimajor = 0.1850{{±|0.0033}}
| eccentricity = <0.333
}}
{{Orbitbox end}}

==References==
{{reflist||refs=

<ref name = EDR3>{{Cite Gaia EDR3|4657193606465368704}}</ref>

<ref name = Tycho2000>{{cite journal |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=March 2000 |volume=355 |pages=L27–L30 |issn=0004-6361 |bibcode=2000A&A...355L..27H}}</ref>

<ref name = Gray2006>{{cite journal | last1 = Gray | first1 = R. O. | last2 = Corbally | first2 = C. J. | last3 = Garrison | first3 = R. F. | last4 = McFadden | first4 = M. T. | last5 = Bubar | first5 = E. J. | last6 = McGahee | first6 = C. E. | last7 = O'Donoghue | first7 = A. A. | last8 = Knox | first8 = E. R. | title = Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample | journal = The Astronomical Journal | date = 2 June 2006 | volume = 132 | issue = 1 | pages = 161–170 | issn = 0004-6256 | eissn = 1538-3881 | doi = 10.1086/504637 | bibcode = 2006AJ....132..161G | arxiv = astro-ph/0603770 | doi-access = free }}</ref>

<ref name = Eggen1979>{{cite journal | last1 = Eggen | first1 = O. J. | title = Catalogs of proper-motion stars. I - Stars brighter than visual magnitude 15 and with annual proper motion of 1 arcsec or more | journal = The Astrophysical Journal Supplement Series | date = January 1979 | volume = 39 | page = 89 | issn = 0067-0049 | eissn = 1538-4365 | doi = 10.1086/190566 | bibcode = 1979ApJS...39...89E | doi-access = free}}</ref>

<ref name= SandageFouts1987>{{cite journal | last1 = Sandage | first1 = Allan | last2 = Fouts | first2 = Gary | title = New subdwarfs. VI - Kinematics of 1125 high-proper-motion stars and the collapse of the Galaxy | journal = The Astronomical Journal | date = January 1987 | volume = 93 | page = 74 | issn = 0004-6256 | doi = 10.1086/114291 | bibcode = 1987AJ.....93...74S | doi-access = free}}</ref>

<ref name = Gontcharov2006>{{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=November 2006 |volume=32 |issue=11 |pages=759–771 |doi=10.1134/S1063773706110065 |issn=1063-7737 |bibcode=2006AstL...32..759G |arxiv=1606.08053|s2cid=119231169 }}</ref>

<ref name=Anderson2012>{{cite journal | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | s2cid=119257644 }}</ref>

<ref name = Luck2018>{{cite journal | last1 = Luck | first1 = R. Earle | title = Abundances in the Local Region. III. Southern F, G, and K Dwarfs | journal = The Astronomical Journal | date = 13 February 2018 | volume = 155 | issue = 3 | page = 111 | eissn = 1538-3881 | doi = 10.3847/1538-3881/aaa9b5 | bibcode = 2018AJ....155..111L | doi-access = free}}</ref>

<ref name = Sousa2008>{{cite journal | last1 = Sousa | first1 = S. G. | last2 = Santos | first2 = N. C. | last3 = Mayor | first3 = M. | last4 = Udry | first4 = S. | last5 = Casagrande | first5 = L. | last6 = Israelian | first6 = G. | last7 = Pepe | first7 = F. | last8 = Queloz | first8 = D. | last9 = Monteiro | first9 = M. J. P. F. G. | title = Spectroscopic parameters for 451 stars in the HARPS GTO planet search program | journal = Astronomy & Astrophysics | date = 4 June 2008 | volume = 487 | issue = 1 | pages = 373–381 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361:200809698 | bibcode = 2008A&A...487..373S | arxiv = 0805.4826 | doi-access = free}}</ref>

<ref name = Nordstrom2004>{{cite journal |last1=Nordström |first1=B. |last2=Mayor |first2=M. |last3=Andersen |first3=J. |last4=Holmberg |first4=J. |last5=Pont |first5=F. |last6=Jørgensen |first6=B. R. |last7=Olsen |first7=E. H. |last8=Udry |first8=S. |last9=Mowlavi |first9=N. |title=The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of ~14 000 F and G dwarfs |journal=Astronomy & Astrophysics |date=May 2004 |volume=418 |issue=3 |pages=989–1019 |doi=10.1051/0004-6361:20035959 |issn=0004-6361 |bibcode=2004A&A...418..989N |arxiv=astro-ph/0405198 |doi-access=free}}</ref>

<ref name = Turnbull2015>{{Cite arXiv |arxiv=1510.01731}}</ref>

<ref name = Unger2021>{{cite journal | display-authors = 1 | last1 = Unger | first1 = N. | last2 = Ségransan | first2 = D. | last3 = Queloz | first3 = D. | last4 = Udry | first4 = S. | last5 = Lovis | first5 = C. | last6 = Mordasini | first6 = C. | last7 = Ahrer | first7 = E. | last8 = Benz | first8 = W. | last9 = Bouchy | first9 = F. | last10 = Delisle | first10 = J.-B. | last11 = Díaz | first11 = R. F. | last12 = Dumusque | first12 = X. | last13 = Lo Curto | first13 = G. | last14 = Marmier | first14 = M. | last15 = Mayor | first15 = M. | last16 = Pepe | first16 = F. | last17 = Santos | first17 = N. C. | last18 = Stalport | first18 = M. | last19 = Alonso | first19 = R. | last20 = Collier Cameron | first20 = A. | last21 = Deleuil | first21 = M. | last22 = Figueira | first22 = P. | last23 = Gillon | first23 = M. | last24 = Moutou | first24 = C. | last25 = Pollacco | first25 = D. | last26 = Pompei | first26 = E. | title = The HARPS search for southern extra-solar planets | journal = Astronomy &amp; Astrophysics | date = October 2021 | volume = 654 | page = A104 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/202141351 | bibcode = 2021A&A...654A.104U | arxiv = | doi-access = free}}</ref>

<ref name = Houk1975>{{cite book|last1=Houk |first1=N. |last2=Cowley |first2=A. P. |title=University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. |year=1975 |bibcode=1975mcts.book.....H }}</ref>

}}
{{Stars of Mensa}}

Revision as of 05:25, 9 July 2022

HD 39194
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension 05h 44m 31.9180s[1]
Declination −70° 08′ 36.8578″[1]
Apparent magnitude (V) 8.07±0.01[2]
Characteristics
Spectral type K0 V[3]
U−B color index +0.26[4][5]
B−V color index +0.76[4][5]
Astrometry
Radial velocity (Rv)13.90±0.10[6] km/s
Proper motion (μ) RA: −309.273 mas/yr[1]
Dec.: +1238.862 mas/yr[1]
Parallax (π)37.8235 ± 0.0206 mas[1]
Distance86.23 ± 0.05 ly
(26.44 ± 0.01 pc)
Absolute magnitude (MV)+6.02[7]
Details
Mass0.71[8] M☉
Radius0.74[9] R☉
Luminosity0.389[10] L☉
Surface gravity (log g)4.61±0.05[11] cgs
Temperature5,205±23[11] K
Metallicity [Fe/H]−0.61±0.02[11] dex
Rotational velocity (v sin i)2[12] km/s
Age11.7[8] Gyr
Other designations
CD−70°340, CPD−70°447, GJ 217.2, HD 39194, HIP 27080, SAO 256232, LHS 210
Database references
SIMBADdata

HD 39194 (Gliese 217.2; LHS 210) is a star located in the southern circumpolar constellation Mensa. It has an apparent magnitude of 8.07,[2] making it readily visible in binoculars but not to the naked eye. The object is relatively close at a distance of 86 light years[1] but is receding with a heliocentric radial velocity of 13.9 km/s.[6]

HD 39194 has a general stellar classification of K0 V,[3] indicating that it is a K-type main-sequence star. Houk & Cowley found a slightly warmer class of G8 V,[13] instead making it a G-type main-sequence star. Nevertheless, it has 71% the mass of the Sun[8] and an effective temperature of 5,205 K,[11] giving an orange hue. It radius of 0.74 R☉[9] yields a luminosity only 38% that of the Sun.[10] HD 39194 is estimated to be 11.7 billion years old[8] and is extremely chromospherically inactive.[3] Despite being a planetary host, it has an iron abundance only 24% that of the Sun.[11] HD 39194's projected rotational velocity is similar to the Sun's, with the value being 2 km/s.[12]

Planetary System

This star was selected as a potential candidate for exoplanets beginning in 2015.[9] After 7 years of observations, a team of astronomers discovered 3 super-Earths circling HD 39194 in eccentric orbits;[10] none of the planets are in the habitable zone. It should be noted that HD 39194 b and d have similar masses.

The HD 39194 planetary system[10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥4.13±0.20 M🜨 0.056±0.001 5.6368±0.0004 <0.207 — —
c ≥6.29±0.51 M🜨 0.103±0.002 14.030±0.003 <0.154 — —
d ≥4.13±0.60 M🜨 0.1850±0.0033 33.91±0.03 <0.333 — —

References

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. ^ a b c Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2 June 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. eISSN 1538-3881. ISSN 0004-6256.
  4. ^ a b Eggen, O. J. (January 1979). "Catalogs of proper-motion stars. I - Stars brighter than visual magnitude 15 and with annual proper motion of 1 arcsec or more". The Astrophysical Journal Supplement Series. 39: 89. Bibcode:1979ApJS...39...89E. doi:10.1086/190566. eISSN 1538-4365. ISSN 0067-0049.
  5. ^ a b Sandage, Allan; Fouts, Gary (January 1987). "New subdwarfs. VI - Kinematics of 1125 high-proper-motion stars and the collapse of the Galaxy". The Astronomical Journal. 93: 74. Bibcode:1987AJ.....93...74S. doi:10.1086/114291. ISSN 0004-6256.
  6. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
  7. ^ 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.
  8. ^ a b c d Luck, R. Earle (13 February 2018). "Abundances in the Local Region. III. Southern F, G, and K Dwarfs". The Astronomical Journal. 155 (3): 111. Bibcode:2018AJ....155..111L. doi:10.3847/1538-3881/aaa9b5. eISSN 1538-3881.
  9. ^ a b c A bot will complete this citation soon. Click here to jump the queue arXiv:1510.01731.
  10. ^ a b c d Unger, N.; et al. (October 2021). "The HARPS search for southern extra-solar planets". Astronomy & Astrophysics. 654: A104. Bibcode:2021A&A...654A.104U. doi:10.1051/0004-6361/202141351. eISSN 1432-0746. ISSN 0004-6361.
  11. ^ a b c d e Sousa, S. G.; Santos, N. C.; Mayor, M.; Udry, S.; Casagrande, L.; Israelian, G.; Pepe, F.; Queloz, D.; Monteiro, M. J. P. F. G. (4 June 2008). "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program". Astronomy & Astrophysics. 487 (1): 373–381. arXiv:0805.4826. Bibcode:2008A&A...487..373S. doi:10.1051/0004-6361:200809698. eISSN 1432-0746. ISSN 0004-6361.
  12. ^ a b Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (May 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of ~14 000 F and G dwarfs". Astronomy & Astrophysics. 418 (3): 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. ISSN 0004-6361.
  13. ^ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
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