Delta Herculis: Difference between revisions

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== Properties ==
== Properties ==


Delta Herculis A presents as an [[stellar classification#Class A|A-type]] [[main-sequence star|main-sequence]] [[subgiant]] with a [[stellar classification]] of A3IV. It has both a mass and radius that are roughly two times solar yielding a total [[luminosity]] of about {{Solar luminosity|link=y|18.5}}<ref name="KALER"/>
Delta Herculis A presents as an [[stellar classification#Class A|A-type]] [[subgiant]] with a [[stellar classification]] of A3IV. It has both a mass and radius that are roughly two times solar yielding a total [[luminosity]] of about {{Solar luminosity|link=y|18.5}}<ref name="KALER"/>


==See also==
==See also==

Latest revision as of 17:10, 30 June 2025

Template:Short description

δ Herculis
Template:Location mark
Location of δ Herculis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.126[1]
Characteristics
Spectral type A3IV[1]
U−B Template:Engvar +0.7[2]
B−V Template:Engvar +0.08[2]
Astrometry
Radial velocity (Rv)−40.0[1] km/s
Proper motion (μ) RA: -21.14[1] mas/yr
Dec.: -157.68[1] mas/yr
Parallax (π)43.41±0.15 mas[3]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+1.31[4]
Details
Mass2.4[5] Template:Solar mass
Radius2.2[5] Template:Solar radius
Luminosity38[5] Template:Solar luminosity
Temperature9,620 ± 350[5] K
Rotational velocity (v sin i)270[6] km/s
Age370[6] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Sarin, δ Her, 65 Her, BD+25°3221, CCDM J17151+2451A, FK5 641, GC 23294, HD 156164, HIP 84379, HR 6410, SAO 84951
Database references
SIMBADdata

Script error: No such module "Check for unknown parameters".

Delta Herculis (δ Herculis, abbreviated Delta Her, δ Her) is a multiple star system in the constellation of Hercules. Its light produces to us apparent magnitude 3.12, as such the third-brightest star in the large, fairly dim constellation. Based on parallax measurement taken during the Hipparcos mission, it is approximately Template:Convert from the Sun.

Components

It consists of a binary pair, designated Delta Herculis A, together with three potential companions, suffixed B, C and D. Furthermore B is believed to be an optical binary.[7] A's components are designated Delta Herculis Aa (officially named Sarin Template:IPAc-en, the traditional name of the system)[8] and Ab. The angular separation between the main component A and the component B, which has a magnitude of 8.74, is 8.5 arcseconds [1].

Nomenclature

δ Herculis (Latinised to Delta Herculis) is the system's Bayer designation. The designations of the four constituents as Delta Herculis A, B, C and D, and those of A's components - Delta Herculis 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).[9]

It bore the traditional name Sarin.[10][11] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[12] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[13] It approved the name Sarin for the component Delta Herculis Aa on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[8]

In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Menkib al Jathi al Aisr, which was translated into Latin as Humerus Sinister Ingeniculi, meaning kneeler's left shoulder.[14]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Left Wall of Heavenly Market Enclosure, refers to an asterism which represents eleven old states in China which is marking the left borderline of the enclosure, consisting of Delta Herculis, Lambda Herculis, Mu Herculis, Omicron Herculis, 112 Herculis, Zeta Aquilae, Theta1 Serpentis, Eta Serpentis, Nu Ophiuchi, Xi Serpentis and Eta Ophiuchi.[15] Consequently, the Chinese name for Delta Herculis itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx), and represents the state of Wei (魏),[16][17] together with 33 Capricorni, according to Ian Ridpath version[18] or Phi Capricorni and Chi Capricorni in R.H. Allen's version[19] in Twelve States (asterism).

Properties

Delta Herculis A presents as an A-type subgiant with a stellar classification of A3IV. It has both a mass and radius that are roughly two times solar yielding a total luminosity of about Template:Solar luminosity[6]

See also

References

Template:Reflist

External links

Template:Stars of Hercules Template:Sky

  1. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  2. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named MERMILLIOD
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named LEEUWEN
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  5. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named aass85_3_1015
  6. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named KALER
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named BBC1
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WIKISKY
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named mnras55_429
  15. ↑ 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.
  16. ↑ 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.
  17. ↑ Template:In lang English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
  18. ↑ Ian Ridpath's Startales - Capricornus the Sea Goat
  19. ↑ Star Names - R.H.Allen p.142
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