36 Ophiuchi

36 Ophiuchi
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Observation data; Epoch J2000 Equinox J2000
Constellation	Ophiuchus
Right ascension	A: Template:RA; B: Template:RA; C: Template:RA
Declination	A: Template:DEC; B: Template:DEC; C: Template:DEC
Apparent magnitude (V)	5.08/5.03/6.34
Characteristics
Spectral type	K2 V/K1 V/K5 V
U−B Template:Engvar	0.51(AB)/1.04
B−V Template:Engvar	0.85(AB)/1.16
Variable type	C: RS CVn
Astrometry
36 Oph A
Radial velocity (Rv)	−0.6 km/s
Proper motion (μ)	RA: Template:Val mas/yr ; Dec.: Template:Val mas/yr
Parallax (π)	168.0031±0.1343 mas
Distance	Template:Rnd ± Template:Rnd ly ; (Template:Rnd ± Template:Rnd pc)
36 Oph B
Radial velocity (Rv)	0.0 km/s
Proper motion (μ)	RA: Template:Val mas/yr ; Dec.: Template:Val mas/yr
Parallax (π)	168.1303±0.1081 mas
Distance	Template:Rnd ± Template:Rnd ly ; (Template:Rnd ± Template:Rnd pc)
36 Oph C
Radial velocity (Rv)	Template:Val km/s
Proper motion (μ)	RA: Template:Val mas/yr ; Dec.: Template:Val mas/yr
Parallax (π)	167.9617±0.0311 mas
Distance	Template:Rnd ± Template:Rnd ly ; (Template:Rnd ± Template:Rnd pc)
Details
36 Oph A
Mass	Template:Val Template:Solar mass
Radius	Template:Val Template:Solar radius
Luminosity	Template:Val Template:Solar luminosity
Temperature	Template:Val K
Metallicity [Fe/H]	Template:Val dex
Age	Template:Val Gyr
36 Oph B
Mass	Template:Val Template:Solar mass
Radius	Template:Solar radius calculatorTemplate:Efn Template:Solar radius
Luminosity	0.32 Template:Solar luminosity
Surface gravity (log g)	4.61 cgs
Temperature	Template:Val K
Metallicity [Fe/H]	Template:Val dex
Age	Template:Val Gyr
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
SIMBAD	AB
	A
	B
	C
Exoplanet Archive	A
	B
	C
ARICNS	A
	B
	C

Template:Short description Template:Sky

Template:Starbox visbin

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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.^[9] The tertiary star is an orange main-sequence dwarf of spectral type K5.

File:V2215OphLightCurve.png

A visual band light curve for 36 Ophiuchi C (V2215 Ophiuchi), plotted from ASAS-SN data^[10]

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)^[11] 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.^[12]

Hunt for substellar objects

The McDonald Observatory team has set limits to the presence of one or more planets^[13] 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.^[14]

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.^[15]

Observation

On 26 October 2021, it was occulted by Venus as viewed from the Indian Ocean.^[16]Template:Rp

Notes

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References

Template:Reflist

External links

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https://arxiv.org/abs/astro-ph/0604171

Template:Nearest systems Template:Stars of Ophiuchus

↑ ^a ^b ^c ^d ^e ^f
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↑ ^a ^b Template:Cite Gaia EDR3
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↑ ^a ^b ^c Template:Cite Gaia EDR3
↑ ^a ^b ^c ^d Cite error: Invalid <ref> tag; no text was provided for refs named Luck2017
↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa505_1_205
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↑ Irwin et al. (1996).
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[SIMBAD-1] ↑ ^a ^b ^c ^d ^e ^f Script error: No such module "citation/CS1".

A: LHS 437 -- High proper-motion Star

B: LHS 438 -- High proper-motion Star

C: V* V2215 Oph -- Variable of RS CVn type

[2] A: LHS 437 -- High proper-motion Star

[3] B: LHS 438 -- High proper-motion Star

[4] C: V* V2215 Oph -- Variable of RS CVn type

[GaiaEDR3a-2] Template:Cite Gaia EDR3

[GaiaEDR3b-3] Template:Cite Gaia EDR3

[GaiaEDR3c-4] Template:Cite Gaia EDR3

[Luck2017-5] Cite error: Invalid <ref> tag; no text was provided for refs named Luck2017

[aaa505_1_205-6] Cite error: Invalid <ref> tag; no text was provided for refs named aaa505_1_205

[Hardegree-Ullman2023-7] Cite error: Invalid <ref> tag; no text was provided for refs named Hardegree-Ullman2023

[Luck2018-8] ↑ ^a ^b ^c ^d ^e ^f ^g Cite error: Invalid <ref> tag; no text was provided for refs named Luck2018

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[ASAS-SN-10] Cite error: Invalid <ref> tag; no text was provided for refs named ASAS-SN

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[IAU-CSN-12] Script error: No such module "citation/CS1".

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[Irwin-14] Irwin et al. (1996).

[Nasa2019-03-07-15] Cite error: Invalid <ref> tag; no text was provided for refs named Nasa2019-03-07

[Mus2002-16] Script error: No such module "citation/CS1".

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Observation data Epoch J2000 Equinox J2000
Script error: No such module "Location map".
Constellation	Ophiuchus
Right ascension	A: Template:RA B: Template:RA C: Template:RA^[1]
Declination	A: Template:DEC B: Template:DEC C: Template:DEC^[1]
Apparent magnitude (V)	5.08/5.03/6.34^[1]
Characteristics
Spectral type	K2 V/K1 V/K5 V^[1]
U−B Template:Engvar	0.51(AB)/1.04
B−V Template:Engvar	0.85(AB)/1.16
Variable type	C: RS CVn
Astrometry
36 Oph A
Radial velocity (R_v)	−0.6^[1] km/s
Proper motion (μ)	RA: Template:Val mas/yr^[2] Dec.: Template:Val mas/yr^[2]
Parallax (π)	168.0031±0.1343 mas^[2]
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
36 Oph B
Radial velocity (R_v)	0.0^[1] km/s
Proper motion (μ)	RA: Template:Val mas/yr^[3] Dec.: Template:Val mas/yr^[3]
Parallax (π)	168.1303±0.1081 mas^[3]
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)

36 Oph C
Radial velocity (R_v)	Template:Val^[4] km/s
Proper motion (μ)	RA: Template:Val mas/yr^[4] Dec.: Template:Val mas/yr^[4]
Parallax (π)	167.9617±0.0311 mas^[4]
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)

Details
36 Oph A
Mass	Template:Val^[5] Template:Solar mass
Radius	Template:Val^[6] Template:Solar radius
Luminosity	Template:Val^[7] Template:Solar luminosity
Temperature	Template:Val^[5] K
Metallicity [Fe/H]	Template:Val^[5] dex
Age	Template:Val^[5] Gyr
36 Oph B
Mass	Template:Val^[8] Template:Solar mass
Radius	Template:Solar radius calculator^[8]Template:Efn Template:Solar radius
Luminosity	0.32^[8] Template:Solar luminosity
Surface gravity (log g)	4.61^[8] cgs
Temperature	Template:Val^[8] K
Metallicity [Fe/H]	Template:Val^[8] dex
Age	Template:Val^[8] Gyr
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
SIMBAD	AB
	A
	B
	C
Exoplanet Archive	A
	B
	C
ARICNS	A
	B
	C

36 Ophiuchi

Contents

Characteristics

Nomenclature

Hunt for substellar objects

Observation

Notes

References

Further reading

External links

Navigation menu

36 Ophiuchi

Characteristics

Nomenclature

Hunt for substellar objects

Observation

Notes

References

Further reading

External links

Navigation menu

Search