36 Ophiuchi: Difference between revisions

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Candidate planet
 
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  | epoch=J2000  
  | epoch=J2000  
  | constell=[[Ophiuchus]]  
  | constell=[[Ophiuchus]]  
  | ra=A:&nbsp;{{RA|17|15|20.851}}<br/>B:&nbsp;{{RA|17|15|20.978}}<br/>C:&nbsp;{{RA|17|16|13.3624}}<ref name="SIMBAD">{{cite web
  | ra=A:&nbsp;{{RA|17|15|20.7836}}<ref name="GaiaDR3a"/><br/>B:&nbsp;{{RA|17|15|20.9838}}<ref name="GaiaDR3b"/><br/>C:&nbsp;{{RA|17|16|13.3624}}<ref name="GaiaDR3c"/>
|
dec=A:&nbsp;{{DEC|-26|36|06.117}}<ref name="GaiaDR3a"/><br/>B:&nbsp;{{DEC|-26|36|10.173}}<ref name="GaiaDR3b"/><br/>C:&nbsp;{{DEC|-26|32|46.137}}<ref name="GaiaDR3c"/>
| appmag_v=5.08/5.03/6.34<ref name="SIMBAD"/>
}}
{{Starbox character
| class=A: K2V<ref name=Gray2006/><br/>B: K1V<ref name=Gray2006/><br/>C: K5V<ref name=Gray2006/>
| b-v=
| u-b=
| variable=C: [[RS Canum Venaticorum variable|RS CVn]] }}
{{Starbox astrometry
| component1 = 36 Oph A
| radial_v=−0.6<ref name="SIMBAD">{{cite web
  | url=http://simbad.u-strasbg.fr/
  | url=http://simbad.u-strasbg.fr/
  | title=SIMBAD Astronomical Database
  | title=SIMBAD Astronomical Database
Line 26: Line 38:
* B: [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20155885 LHS 438 -- High proper-motion Star ]
* B: [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20155885 LHS 438 -- High proper-motion Star ]
* C: [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20156026 V* V2215 Oph -- Variable of RS CVn type]</ref>
* C: [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20156026 V* V2215 Oph -- Variable of RS CVn type]</ref>
|
dec=A:&nbsp;{{DEC| -26|36|09.04}}<br/>B:&nbsp;{{DEC| -26|36|10.18}}<br/>C:&nbsp;{{DEC| -26|32|46.129}}<ref name="SIMBAD"/>
| appmag_v=5.08/5.03/6.34<ref name="SIMBAD"/>
}}
{{Starbox character
|  class=K2&nbsp;V/K1&nbsp;V/K5&nbsp;V<ref name="SIMBAD"/>
| b-v=0.85(AB)/1.16
| u-b=0.51(AB)/1.04
| variable=C: [[RS Canum Venaticorum variable|RS CVn]] }}
{{Starbox astrometry
| component1 = 36 Oph A
| radial_v=−0.6<ref name="SIMBAD"/>
  | prop_mo_ra={{val|-498.600}}
  | prop_mo_ra={{val|-498.600}}
  | prop_mo_dec={{val|-1149.158|fmt=commas}}
  | prop_mo_dec={{val|-1149.158|fmt=commas}}
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| gravity        = 4.70<ref name=Luck2018/>
| gravity        = 4.70<ref name=Luck2018/>
| rotation      = {{Val|18.0|0.4}}<ref name=Otani2022/> days
| rotation      = {{Val|18.0|0.4}}<ref name=Otani2022/> days
| habitable_inner = 0.32<ref name=Painter2025/> [[astronomical unit|AU]]
| habitable_outer = 0.79<ref name=Painter2025/> AU
| metal_fe      = {{Val|-0.22}}<ref name=Luck2018/>
| metal_fe      = {{Val|-0.22}}<ref name=Luck2018/>
| age_myr        = {{Val|590|70}}<ref name=Otani2022/>
| age_myr        = {{Val|590|70}}<ref name=Otani2022/>
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The primary and secondary stars (also known as HD 155886) are nearly identical orange [[main-sequence]] dwarfs of [[spectral type]] K2/K1. This binary is unusual because its eruptions do not seem to conform to the Waldmeier effect; that is, the strongest eruptions of HD 155886 are not the ones characterized by the fast eruption onset.<ref>{{citation|arxiv=1909.12148|year=2019|title=Waldmeier Effect in Stellar Cycles|doi=10.3847/1538-4357/ab4a17|last1=Garg|first1=Suyog|last2=Karak|first2=Bidya Binay|last3=Egeland|first3=Ricky|last4=Soon|first4=Willie|last5=Baliunas|first5=Sallie|journal=The Astrophysical Journal|volume=886|issue=2|page=132|bibcode=2019ApJ...886..132G|s2cid=202888617 |doi-access=free }}</ref>
The primary and secondary stars (also known as HD 155886) are nearly identical orange [[main-sequence]] dwarfs of [[spectral type]] K2/K1. This binary is unusual because its eruptions do not seem to conform to the Waldmeier effect; that is, the strongest eruptions of HD 155886 are not the ones characterized by the fast eruption onset.<ref>{{citation|arxiv=1909.12148|year=2019|title=Waldmeier Effect in Stellar Cycles|doi=10.3847/1538-4357/ab4a17|last1=Garg|first1=Suyog|last2=Karak|first2=Bidya Binay|last3=Egeland|first3=Ricky|last4=Soon|first4=Willie|last5=Baliunas|first5=Sallie|journal=The Astrophysical Journal|volume=886|issue=2|page=132|bibcode=2019ApJ...886..132G|s2cid=202888617 |doi-access=free }}</ref>


The tertiary star is an orange main-sequence dwarf of [[spectral type]] K5. The age for this star derived using [[gyrochronology]] is about 600 million years, while the age derived for the AB pair is 1.43 billion years. This discrepancy suggest that the A/B stars interacted with each other and slowed down their rotation periods, providing a higher age.<ref name=Otani2022/>
The tertiary star is an orange main-sequence dwarf of [[spectral type]] K5. The age for this star derived using [[gyrochronology]] is about 600 million years, while the age derived for the AB pair is 1.43 billion years. This discrepancy suggest that the A/B stars interacted with each other and slowed down their rotation periods, providing a spuriously higher age.<ref name=Otani2022/>


[[Image:V2215OphLightCurve.png|300px|thumb|left|A [[Photometric system#Photometric letters|visual band]] [[light curve]] for 36 Ophiuchi C (V2215 Ophiuchi), plotted from ''[[All Sky Automated Survey for SuperNovae|ASAS-SN]]'' data<ref name="ASAS-SN"/>]]
[[Image:V2215OphLightCurve.png|300px|thumb|left|A [[Photometric system#Photometric letters|visual band]] [[light curve]] for 36 Ophiuchi C (V2215 Ophiuchi), plotted from ''[[All Sky Automated Survey for SuperNovae|ASAS-SN]]'' data<ref name="ASAS-SN"/>]]


Star C is separated from the A-B pair by 700 [[arcseconds]], compared to a minimum of 4.6 arcseconds for A-B, so its effect on the movements of the A-B pair is small. A and B have active [[chromosphere]]s.
Star C is separated from the A-B pair by 700 [[arcseconds]], compared to a minimum of 4.6 arcseconds for A-B, so its effect on the movements of the A-B pair is small. A and B have active [[chromosphere]]s.
At present the distance between the stars forming the AB-pair is 5.1 arcseconds and the position angle is 139 degrees, while star C is 731.6 arcseconds away from the A-component and situated at a position angle of 74 degrees.
At present the distance between the stars forming the AB-pair is 5.1 arcseconds and the position angle is 139 degrees, while star C is 731.6 arcseconds away from the A-component and situated at a position angle of 74 degrees.  


==Nomenclature==
==Nomenclature==
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The [[McDonald Observatory]] team has set limits to the presence of one or more planets<ref name="search"/> around 36 Ophiuchi A with masses between 0.13 and 5.4 [[Jupiter mass]]es and average separations spanning between 0.05 and 5.2 [[astronomical unit]]s (AU), although beyond 1.5 AU orbits are inherently unstable around either 36 Ophiuchi A or 36 Ophiuchi B.<ref name="Irwin">Irwin ''et al.'' (1996).</ref>
The [[McDonald Observatory]] team has set limits to the presence of one or more planets<ref name="search"/> around 36 Ophiuchi A with masses between 0.13 and 5.4 [[Jupiter mass]]es and average separations spanning between 0.05 and 5.2 [[astronomical unit]]s (AU), although beyond 1.5 AU orbits are inherently unstable around either 36 Ophiuchi A or 36 Ophiuchi B.<ref name="Irwin">Irwin ''et al.'' (1996).</ref>


The star C (or namely HD 156026) is among five nearby paradigms as [[K-type star]]s of a type in a 'sweet spot’ between Sun-analog stars and [[M-class star|M stars]] for the likelihood of evolved life, per analysis of Giada Arney from [[NASA]]'s [[Goddard Space Flight Center]].<ref name=Nasa2019-03-07/>
The star C (or namely HD 156026) is among five nearby paradigms as [[K-type star]]s of a type in a 'sweet spot’ between Sun-analog stars and [[M-class star|M stars]] for the likelihood of evolved life, per analysis of Giada Arney from [[NASA]]'s [[Goddard Space Flight Center]].<ref name=Nasa2019-03-07/> It presents a difference on [[proper motion]] measurements taken by the [[Hipparcos]] and [[Gaia (spacecraft)|Gaia]] spacecrafts, suggesting the presence of a giant planet.<ref name=Painter2025/>


==Observation==
==Observation==
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==See also==
==See also==
* [[List of nearest stars by spectral type#List of nearest K-type stars|List of nearest K-type stars]]
* [[List of nearest stars by spectral type#List of nearest K-type stars|List of nearest K-type stars]]
==Notes==
{{notelist}}


==References==
==References==
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<ref name="ASAS-SN">{{cite web |url=https://asas-sn.osu.edu/variables/lookup |website=ASAS-SN Variable Stars Database|title=ASAS-SN Variable Stars Database|publisher=ASAS-SN |access-date=6 January 2022}}</ref>
<ref name="ASAS-SN">{{cite web |url=https://asas-sn.osu.edu/variables/lookup |website=ASAS-SN Variable Stars Database|title=ASAS-SN Variable Stars Database|publisher=ASAS-SN |access-date=6 January 2022}}</ref>
<ref name=Gray2006>{{cite journal | display-authors=1 | 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]] | volume=132 | issue=1 | pages=161–170 |date=July 2006 | doi=10.1086/504637 | bibcode=2006AJ....132..161G | arxiv=astro-ph/0603770 | s2cid=119476992 }}</ref>


<ref name=Hardegree-Ullman2023>{{Cite journal |last1=Hardegree-Ullman |first1=Kevin K. |last2=Apai |first2=Dániel |last3=Bergsten |first3=Galen J. |last4=Pascucci |first4=Ilaria |last5=López-Morales |first5=Mercedes |date=2023-06-01 |title=Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O2 Levels in Nearby Transiting Habitable-zone Exoplanets |bibcode=2023AJ....165..267H |journal=[[The Astronomical Journal]] |volume=165 |issue=6 |pages=267 |doi=10.3847/1538-3881/acd1ec |doi-access=free |arxiv=2304.12490 |issn=0004-6256}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/AJ/165/267&Name=*%2036%20Oph%20A 36 Ophiuchi A's database entry] at [[VizieR]].</ref>
<ref name=Hardegree-Ullman2023>{{Cite journal |last1=Hardegree-Ullman |first1=Kevin K. |last2=Apai |first2=Dániel |last3=Bergsten |first3=Galen J. |last4=Pascucci |first4=Ilaria |last5=López-Morales |first5=Mercedes |date=2023-06-01 |title=Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O2 Levels in Nearby Transiting Habitable-zone Exoplanets |bibcode=2023AJ....165..267H |journal=[[The Astronomical Journal]] |volume=165 |issue=6 |pages=267 |doi=10.3847/1538-3881/acd1ec |doi-access=free |arxiv=2304.12490 |issn=0004-6256}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/AJ/165/267&Name=*%2036%20Oph%20A 36 Ophiuchi A's database entry] at [[VizieR]].</ref>


<ref name=Otani2022>{{Cite journal |last1=Otani |first1=Tomomi |last2=von Hippel |first2=Ted |last3=Buzasi |first3=Derek |last4=Oswalt |first4=T. D. |last5=Stone-Martinez |first5=Alexander |last6=Majewski |first6=Patrice |date=2022-05-01 |title=A Monte Carlo Method for Evaluating Empirical Gyrochronology Models and Its Application to Wide Binary Benchmarks |journal=[[The Astrophysical Journal]] |volume=930 |issue=1 |pages=36 |doi=10.3847/1538-4357/ac6035 |doi-access=free |arxiv=2105.07266 |bibcode=2022ApJ...930...36O |issn=0004-637X}}</ref>
<ref name=Otani2022>{{Cite journal |last1=Otani |first1=Tomomi |last2=von Hippel |first2=Ted |last3=Buzasi |first3=Derek |last4=Oswalt |first4=T. D. |last5=Stone-Martinez |first5=Alexander |last6=Majewski |first6=Patrice |date=2022-05-01 |title=A Monte Carlo Method for Evaluating Empirical Gyrochronology Models and Its Application to Wide Binary Benchmarks |journal=[[The Astrophysical Journal]] |volume=930 |issue=1 |pages=36 |doi=10.3847/1538-4357/ac6035 |doi-access=free |arxiv=2105.07266 |bibcode=2022ApJ...930...36O |issn=0004-637X}}</ref>
<ref name=Painter2025>{{Cite journal |last=Painter |first=Katie E. |last2=Bowler |first2=Brendan P. |last3=Franson |first3=Kyle |last4=Becker |first4=Juliette C. |last5=Burt |first5=Jennifer A. |title=Astrometric Accelerations of Provisional Targets for the Habitable Worlds Observatory |date=2025-06-26 |arxiv=2506.21768 |journal=The Astronomical Journal }}</ref>


<ref name=aaa505_1_205>{{cite journal
<ref name=aaa505_1_205>{{cite journal

Latest revision as of 02:04, 30 June 2025

Template:Short description Template:Sky

Template:Starbox visbin

36 Ophiuchi
Script error: No such module "Location map".
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension A: Template:RA[1]
B: Template:RA[2]
C: Template:RA[3]
Declination A: Template:DEC[1]
B: Template:DEC[2]
C: Template:DEC[3]
Apparent magnitude (V) 5.08/5.03/6.34[4]
Characteristics
Spectral type A: K2V[5]
B: K1V[5]
C: K5V[5]
Variable type C: RS CVn
Astrometry
36 Oph A
Radial velocity (Rv)−0.6[4] km/s
Proper motion (μ) RA: Template:Val mas/yr[1]
Dec.: Template:Val mas/yr[1]
Parallax (π)168.0031±0.1343 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
36 Oph B
Radial velocity (Rv)0.0[4] km/s
Proper motion (μ) RA: Template:Val mas/yr[2]
Dec.: Template:Val mas/yr[2]
Parallax (π)168.1303±0.1081 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
36 Oph C
Radial velocity (Rv)Template:Val[3] km/s
Proper motion (μ) RA: Template:Val mas/yr[3]
Dec.: Template:Val mas/yr[3]
Parallax (π)167.9617±0.0311 mas[3]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
36 Oph A
MassTemplate:Val[6] Template:Solar mass
RadiusTemplate:Val[7] Template:Solar radius
LuminosityTemplate:Val[8] Template:Solar luminosity
TemperatureTemplate:Val[6] K
Metallicity [Fe/H]Template:Val[6] dex
RotationTemplate:Val[9] days
Age1.43[9] Gyr
36 Oph B
MassTemplate:Val[10] Template:Solar mass
RadiusTemplate:Val[11] Template:Solar radius
Luminosity0.32[10] Template:Solar luminosity
Surface gravity (log g)4.61[10] cgs
TemperatureTemplate:Val[10] K
Metallicity [Fe/H]Template:Val[10] dex
RotationTemplate:Val[9] days
Age1.43[9] Gyr
36 Oph C
MassTemplate:Val[10] Template:Solar mass
RadiusTemplate:Val[11] Template:Solar radius
Luminosity0.14[10] Template:Solar luminosity
Habitable zone inner limit0.32[12] AU
Habitable zone outer limit0.79[12] AU
Surface gravity (log g)4.70[10] cgs
TemperatureTemplate:Val[10] K
Metallicity [Fe/H]Template:Val[10] dex
RotationTemplate:Val[9] days
AgeTemplate:Val[9] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
36 Oph, WDS J17153-2636
AB: GJ 663, CD−26°12026, GCTP 3908.00, HIP 84405
A: Guniibuu, HR 6402, HD 155886, LHS 437, SAO 185198
B: HR 6401, HD 155885, LHS 438, SAO 185199
C: V2215 Ophiuchi, GJ 664, CD−26°12036, HD 156026, GCTP 3913.00, LHS 439, SAO 185213, HIP 84478
Database references
SIMBADAB
A
B
C
Exoplanet ArchiveB
C
ARICNSA
B
C

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36 Ophiuchi (or Guniibuu for component A) is a triple star system 19.5 light-years from Earth in the constellation Ophiuchus.

Characteristics

The primary and secondary stars (also known as HD 155886) are nearly identical orange main-sequence dwarfs of spectral type K2/K1. This binary is unusual because its eruptions do not seem to conform to the Waldmeier effect; that is, the strongest eruptions of HD 155886 are not the ones characterized by the fast eruption onset.[13]

The tertiary star is an orange main-sequence dwarf of spectral type K5. The age for this star derived using gyrochronology is about 600 million years, while the age derived for the AB pair is 1.43 billion years. This discrepancy suggest that the A/B stars interacted with each other and slowed down their rotation periods, providing a spuriously higher age.[9]

File:V2215OphLightCurve.png
A visual band light curve for 36 Ophiuchi C (V2215 Ophiuchi), plotted from ASAS-SN data[14]

Star C is separated from the A-B pair by 700 arcseconds, compared to a minimum of 4.6 arcseconds for A-B, so its effect on the movements of the A-B pair is small. A and B have active chromospheres. At present the distance between the stars forming the AB-pair is 5.1 arcseconds and the position angle is 139 degrees, while star C is 731.6 arcseconds away from the A-component and situated at a position angle of 74 degrees.

Nomenclature

In the beliefs of the Kamilaroi and Euahlayi Aboriginal peoples in New South Wales, Australia, the star is called Guniibuu that represents the robin red-breast bird (Petroica boodang). In 2016, the IAU organized a Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN approved the name Guniibuu for the star A on 10 August 2018 and it is now so included in the List of IAU-approved Star Names.[16]

Hunt for substellar objects

The McDonald Observatory team has set limits to the presence of one or more planets[17] around 36 Ophiuchi A with masses between 0.13 and 5.4 Jupiter masses and average separations spanning between 0.05 and 5.2 astronomical units (AU), although beyond 1.5 AU orbits are inherently unstable around either 36 Ophiuchi A or 36 Ophiuchi B.[18]

The star C (or namely HD 156026) is among five nearby paradigms as K-type stars of a type in a 'sweet spot’ between Sun-analog stars and M stars for the likelihood of evolved life, per analysis of Giada Arney from NASA's Goddard Space Flight Center.[19] It presents a difference on proper motion measurements taken by the Hipparcos and Gaia spacecrafts, suggesting the presence of a giant planet.[12]

Observation

On 26 October 2021, it was occulted by Venus as viewed from the Indian Ocean.[20]Template:Rp

See also

References

Template:Reflist

Further reading

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External links

Template:Nearest systems Template:Stars of Ophiuchus

  1. ↑ a b c d Template:Cite Gaia DR3
  2. ↑ a b c d Template:Cite Gaia DR3
  3. ↑ a b c d e Template:Cite Gaia DR3
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  5. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Gray2006
  6. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Luck2017
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa505_1_205
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Hardegree-Ullman2023
  9. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Otani2022
  10. ↑ a b c d e f g h i j Cite error: Invalid <ref> tag; no text was provided for refs named Luck2018
  11. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named tic
  12. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Painter2025
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named ASAS-SN
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named search
  18. ↑ Irwin et al. (1996).
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Nasa2019-03-07
  20. ↑ Script error: No such module "citation/CS1".
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