Rho Scorpii

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Template:Short description

ρ Scorpii
Template:Location mark
Location of ρ Scorpii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension Template:RA[1]
Declination Template:DEC [1]
Apparent magnitude (V) 3.86[2]
Characteristics
Spectral type B2 IV[3]
U−B Template:Engvar -0.82[2]
B−V Template:Engvar -0.20[2]
Astrometry
Radial velocity (Rv)−0.40[4] km/s
Proper motion (μ) RA: −15.68[1] mas/yr
Dec.: −24.88[1] mas/yr
Parallax (π)6.91±0.19 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.93[5]
Orbit[6]
Period (P)4.0033 d
Eccentricity (e)0.27
Periastron epoch (T)2442178.6060 JD
Argument of periastron (ω)
(secondary)		231°
Semi-amplitude (K1)
(primary)		16.40 km/s
Details
MassTemplate:Val[3] Template:Solar mass
RadiusTemplate:Solar radius calculator[3]Template:Efn Template:Solar radius
Luminosity (bolometric)3,432[3] Template:Solar luminosity
Temperature21,150[3] K
Rotational velocity (v sin i)113[7] km/s
Age13.7[8] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Iklil, 5 Scorpii, ADS 9846, CCDM J15569-2913A, FK5 3258, GC 21398, HD 142669, HIP 78104, HR 5928, SAO 183957, CD−28°11714[9]
Database references
SIMBADdata

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Rho Scorpii (ρ Scorpii, abbreviated Rho Sco, ρ Sco) is a double star in the constellation of Scorpius. It has an apparent visual magnitude of +3.87, which is bright enough to be seen with the naked eye. Based upon parallax measurements, it is located approximately 472 light years from the Sun.[1] At that distance, the visual magnitude of the system is reduced by 0.07 due to extinction from interstellar dust.[10] It is a member of the Upper Scorpius OB association.[11]

It has two components, designated Rho Scorpii A and B. Rho Scorpii A is itself a single-lined spectroscopic binary whose components are designated Rho Scorpii Aa (formally named Iklil Template:IPAc-en, traditionally the name for several neighboring stars)[12] and Ab.

Nomenclature

ρ Scorpii (Latinised to Rho Scorpii) is the system's Bayer designation. The designations of the three constituents as Rho Scorpii A and B, and those of A's components - Rho Scorpii Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[13]

Rho Scorpii was likely part of the Arabic lunar mansion of Iklil (الإكليل al-ʼiklīl) "the crown (of the forehead)"), along with Beta, Delta, Pi and possibly Nu Scorpii.

The corresponding asterism in Chinese astronomy, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Room, consists of Rho Scorpii, Pi Scorpii, Delta Scorpii, Beta¹ Scorpii and Beta² Scorpii.[14] Consequently, the Chinese name for ρ Scorpii itself is Script error: No such module "Lang". (Script error: No such module "Lang".), "the Second Star of Room".[15]

In 2016, the IAU organized a Working Group on Star Names (WGSN)[16] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[17] It approved the name Iklil for the component Rho Scorpii Aa on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[12]

Properties

Rho Scorpii A displays the spectrum of blue-white B-type subgiant with a stellar classification of B2 IV.[3] It has an estimated mass nearly 8 times that of the Sun's and shines with 3,432 times the Sun's luminosity.[3] The two constituent stars orbit each other with a period of 4 days and an eccentricity of 0.27.[6]

Rho Scorpii B is a magnitude 12.80 visual companion that lies at an angular separation of 38.40 arcseconds along a position angle of 95°, as of the year 2000.[18]

Notes

Template:Notelist

References

Template:Reflist

External links

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Template:Stars of Scorpius

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  2. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Ducati2002
  3. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Hohle2010
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Evans1967
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  6. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Pourbaiz2004
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Simón-Díaz2014
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Posch2025
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Shatsky2002
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Greelman2015
  12. ↑ a b Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
  15. ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WDSC2014
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