36 Ophiuchi

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36 Ophiuchi
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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)Script error: No such module "val".[1] km/s
Proper motion (μ) RA: Script error: No such module "val". mas/yr[1]
Dec.: Script error: No such module "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)Script error: No such module "val".[4] km/s
Proper motion (μ) RA: Script error: No such module "val". mas/yr[2]
Dec.: Script error: No such module "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)Script error: No such module "val".[3] km/s
Proper motion (μ) RA: Script error: No such module "val". mas/yr[3]
Dec.: Script error: No such module "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
MassScript error: No such module "val".[6] Template:Solar mass
RadiusScript error: No such module "val".[7] Template:Solar radius
LuminosityScript error: No such module "val".[8] Template:Solar luminosity
TemperatureScript error: No such module "val".[6] K
Metallicity [Fe/H]Script error: No such module "val".[6] dex
RotationScript error: No such module "val".[9] days
Age1.43[9] Gyr
36 Oph B
MassScript error: No such module "val".[10] Template:Solar mass
RadiusScript error: No such module "val".[11] Template:Solar radius
Luminosity0.32[10] Template:Solar luminosity
Surface gravity (log g)4.61[10] cgs
TemperatureScript error: No such module "val".[10] K
Metallicity [Fe/H]Script error: No such module "val".[10] dex
RotationScript error: No such module "val".[9] days
Age1.43[9] Gyr
36 Oph C
MassScript error: No such module "val".[10] Template:Solar mass
RadiusScript error: No such module "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
TemperatureScript error: No such module "val".[10] K
Metallicity [Fe/H]Script error: No such module "val".[10] dex
RotationScript error: No such module "val".[9] days
AgeScript error: No such module "val".[9] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist
AB: Template:Odlist
A: Template:Odlist
B: Template:Odlist
C: Template:Odlist
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.

Nomenclature

36 Ophiuchi is the system's Flamsteed designation. Component C (HD 156026) was also historically called 30 Scorpii.[13]

In the culture of the Kamilaroi and Euahlayi Aboriginal peoples in New South Wales, Australia, the star is called Guniibuu and represents the robin red-breast bird (Petroica boodang).[14] 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 36 Ophiuchi A on 10 August 2018 and it is now so included in the List of IAU-approved Star Names.[14]

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.[16]

File:V2215OphLightCurve.png
A visual band light curve for 36 Ophiuchi C (V2215 Ophiuchi), plotted from ASAS-SN data[17]

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]

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.

Hunt for substellar objects

The McDonald Observatory team has set limits to the presence of one or more planets[18] 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.[19]

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.[20] It presents a significant 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.[21]Template:Rp

See also

References

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  1. ↑ a b c d e Template:Cite Gaia DR3
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  3. ↑ a b c d e Template:Cite Gaia DR3
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  6. ↑ a b c Script error: No such module "Citation/CS1".36 Ophiuchi A's database entry at VizieR.
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1". 36 Ophiuchi A's database entry at VizieR.
  9. ↑ a b c d e f g Script error: No such module "Citation/CS1".
  10. ↑ a b c d e f g h i j Script error: No such module "Citation/CS1". Database entries at VizieR:
    36 Ophiuchi B
    36 Ophiuchi C
  11. ↑ a b Script error: No such module "Citation/CS1". Database entries at VizieR:36 Oph B
    36 Oph C
  12. ↑ a b c Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ a b Script error: No such module "citation/CS1".
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  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "Citation/CS1".
  19. ↑ Script error: No such module "Citation/CS1".
  20. ↑ Script error: No such module "citation/CS1".
  21. ↑ Script error: No such module "citation/CS1".
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Further reading

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External links

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Template:Nearest systems Template:Stars of Ophiuchus

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